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The IFormatProvider interface has a single member, GetFormat , which is responsible for returning the object that provides formatting information.

Its GetFormat method returns a culture-specific NumberFormatInfo object for formatting numeric values and a culture-specific DateTimeFormatInfo object for formatting date and time values.

DateTimeFormatInfo , which is used for culture-specific formatting of date and time values. Its GetFormat method returns itself. NumberFormatInfo , which is used for culture-specific formatting of numeric values.

Its GetFormat property returns itself. You can also call the any of the overloads of the Format method that have a provider parameter of type IFormatProvider to perform custom formatting operations.

For example, you could format an integer as an identification number or as a telephone number. Para realizar el formato personalizado, el argumento provider debe implementar las interfaces IFormatProvider y ICustomFormatter.

To perform custom formatting, your provider argument must implement both the IFormatProvider and ICustomFormatter interfaces.

GetFormat y solicita un objeto de tipo ICustomFormatter. GetFormat implementation and requests an object of type ICustomFormatter. It then calls the returned ICustomFormatter object's Format method to format each format item in the composite string passed to it.

For an example that converts integers to formatted custom numbers, see Example: A custom formatting operation. For an example that converts unsigned bytes to Roman numerals, see Example: An intercept provider and Roman numeral formatter.

This example defines a format provider that formats an integer value as a customer account number in the form x-xxxxx-xx.

En este ejemplo se define un proveedor de formato personalizado que implementa las interfaces ICustomFormatter y IFormatProvider para hacer dos cosas: This example defines a custom format provider that implements the ICustomFormatter and IFormatProvider interfaces to do two things:.

It displays the parameters passed to its ICustomFormatter. Format implementation. This enables us to see what parameters the Format IFormatProvider, String, Object[] method is passing to the custom formatting implementation for each object that it tries to format.

This can be useful when you're debugging your application. If the object to be formatted is an unsigned byte value that is to be formatted by using the "R" standard format string, the custom formatter formats the numeric value as a Roman numeral.

More flexible. It can be used in any string without requiring a call to a method that supports composite formatting. WriteLine o StringBuilder. Otherwise, you have to call the Format method or another method that supports composite formatting, such as Console.

WriteLine or StringBuilder. More readable. Because the expression to insert into a string appears in the interpolated expression rather than in a argument list, interpolated strings are far easier to code and to read.

Because of their greater readability, interpolated strings can replace not only calls to composite format methods, but they can also be used in string concatenation operations to produce more concise, clearer code.

A comparison of the following two code examples illustrates the superiority of interpolated strings over string concatenation and calls to composite formatting methods.

The use of multiple string concatenation operations in the following example produces verbose and hard-to-read code.

In contrast, the use of interpolated strings in the following example produce much clearer, more concise code than the string concatenation statement and the call to the Format method in the previous example.

For enumeration values, see Enumeration Format Strings. For Guid values, see the Remarks section of the Guid. ToString String reference page.

La sintaxis general de un elemento de formato es la siguiente: The general syntax of a format item is:.

Si este valor es negativo, el texto del campo se alinea a la izquierda. If this value is negative, text in the field is left-aligned.

If it is positive, text is right-aligned. All standard numeric format strings except "D" which is used with integers only , "G", "R", and "X" allow a precision specifier that defines the number of decimal digits in the result string.

The following example uses standard numeric format strings to control the number of decimal digits in the result string.

If you're using a custom numeric format string , use the "0" format specifier to control the number of decimal digits in the result string, as the following example shows.

By default, formatting operations only display non-zero integral digits. If you are formatting integers, you can use a precision specifier with the "D" and "X" standard format strings to control the number of digits.

You can pad an integer or floating-point number with leading zeros to produce a result string with a specified number of integral digits by using the "0" custom numeric format specifier , as the following example shows.

There is no practical limit. The second parameter of the Format IFormatProvider, String, Object[] method is tagged with the ParamArrayAttribute attribute, which allows you to include either a delimited list or an object array as your format list.

For example, how do you prevent the following method call from throwing a FormatException exception? Una sola llave de apertura o de cierre siempre se interpreta como el principio o el final de un elemento de formato.

A single opening or closing brace is always interpreted as the beginning or end of a format item. To be interpreted literally, it must be escaped.

However, even escaped braces are easily misinterpreted. Se recomienda incluir llaves en la lista de formatos y usar los elementos de formato para insertarlas en la cadena de resultado, como se muestra en el ejemplo siguiente.

We recommend that you include braces in the format list and use format items to insert them in the result string, as the following example shows.

The most common cause of the exception is that the index of a format item doesn't correspond to an object in the format list.

Usually this indicates that you've misnumbered the indexes of format items or you've forgotten to include an object in the format list.

Attempting to include an unescaped left or right brace character also throws a FormatException. This is a problem of compiler overload resolution.

Because the compiler cannot convert an array of integers to an object array, it treats the integer array as a single argument, so it calls the Format String, Object method.

The exception is thrown because there are four format items but only a single item in the format list. Because neither Visual Basic nor C can convert an integer array to an object array, you have to perform the conversion yourself before calling the Format String, Object[] method.

The following example provides one implementation. Cadena de formato compuesto. A composite format string. Objeto al que se va a aplicar formato.

The object to format. A copy of format in which any format items are replaced by the string representation of arg0. The format item in format is invalid.

O bien -or-. The index of a format item is not zero. This method uses the composite formatting feature to convert the value of an expression to its string representation and to embed that representation in a string.

Format , no es necesario centrarse en la sobrecarga concreta que se quiere llamar. However, when calling the String. Format method, it is not necessary to focus on the particular overload that you want to call.

Instead, you can call the method with a composite format string that includes one or more format items.

You assign each format item a numeric index; the first index starts at 0. In addition to the initial string, your method call should have as many additional arguments as it has index values.

For example, a string whose format items have indexes of 0 and 1 should have 2 arguments; one with indexes 0 through 5 should have 6 arguments.

Your language compiler will then resolve your method call to a particular overload of the String. For more detailed documentation on using the String.

Format method, see Getting started with the String. Format method and Which method do I call? The following example uses the Format String, Object method to embed an individual's age in the middle of a string.

An object array that contains zero or more objects to format. A copy of format in which the format items have been replaced by the string representation of the corresponding objects in args.

El valor de format o args es null. En los idiomas de Este de Asia, los caracteres se ordenan teniendo en cuenta los trazos y el radical de los ideogramas.

In East Asian languages, characters are sorted by the stroke and radical of ideographs. Sorting also depends on the order languages and cultures use for the alphabet.

In addition, comparisons can be case-sensitive or case-insensitive, and in some cases casing rules also differ by culture.

Ordinal comparison, on the other hand, uses the Unicode code points of individual characters in a string when comparing and sorting strings.

Sort rules determine the alphabetic order of Unicode characters and how two strings compare to each other. For example, the String.

If the parameter value is StringComparison. CurrentCulture , the method performs a linguistic comparison that uses the conventions of the current culture; if the parameter value is StringComparison.

Ordinal , the method performs an ordinal comparison. Consequently, as the following example shows, if the current culture is U.

English, the first call to the String. Compare String, String, StringComparison method using culture-sensitive comparison considers "a" less than "A", but the second call to the same method using ordinal comparison considers "a" greater than "A".

NET supports word, string, and ordinal sort rules:. A word sort performs a culture-sensitive comparison of strings in which certain nonalphanumeric Unicode characters might have special weights assigned to them.

For example, the hyphen - might have a very small weight assigned to it so that "coop" and "co-op" appear next to each other in a sorted list.

For a list of the String methods that compare two strings using word sort rules, see the String operations by category section.

A string sort also performs a culture-sensitive comparison. It is similar to a word sort, except that there are no special cases, and all nonalphanumeric symbols come before all alphanumeric Unicode characters.

Two strings can be compared using string sort rules by calling the CompareInfo. Compare method overloads that have an options parameter that is supplied a value of CompareOptions.

Note that this is the only method that. NET provides to compare two strings using string sort rules. An ordinal sort compares strings based on the numeric value of each Char object in the string.

An ordinal comparison is automatically case-sensitive because the lowercase and uppercase versions of a character have different code points.

However, if case is not important, you can specify an ordinal comparison that ignores case. This is equivalent to converting the string to uppercase by using the invariant culture and then performing an ordinal comparison on the result.

For a list of the String methods that compare two strings using ordinal sort rules, see the String operations by category section.

A culture-sensitive comparison is any comparison that explicitly or implicitly uses a CultureInfo object, including the invariant culture that is specified by the CultureInfo.

InvariantCulture property. CurrentCulture y CultureInfo. The implicit culture is the current culture, which is specified by the Thread.

CurrentCulture and CultureInfo. CurrentCulture properties. IsLetter devuelve true en todas las referencias culturales. There is considerable variation in the sort order of alphabetic characters that is, characters for which the Char.

IsLetter property returns true across cultures. You can specify a culture-sensitive comparison that uses the conventions of a specific culture by supplying a CultureInfo object to a string comparison method such as Compare String, String, CultureInfo, CompareOptions.

CurrentCulture , StringComparison. Ordinal o CompareOptions. You can specify a culture-sensitive comparison that uses the conventions of the current culture by supplying StringComparison.

Ordinal or CompareOptions. OrdinalIgnoreCase to an appropriate overload of the Compare method. A culture-sensitive comparison is generally appropriate for sorting whereas an ordinal comparison is not.

An ordinal comparison is generally appropriate for determining whether two strings are equal that is, for determining identity whereas a culture-sensitive comparison is not.

The following example illustrates the difference between culture-sensitive and ordinal comparison. If you want the strings to be ordered based on the user's culture, you should order them based on the conventions of the current culture.

If the user's culture changes, the order of sorted strings will also change accordingly. For example, a thesaurus application should always sort words based on the user's culture.

If you want the strings to be ordered based on the conventions of a specific culture, you should order them by supplying a CultureInfo object that represents that culture to a comparison method.

For example, in an application designed to teach students a particular language, you want strings to be ordered based on the conventions of one of the cultures that speaks that language.

If you want the order of strings to remain unchanged across cultures, you should order them based on the conventions of the invariant culture or use an ordinal comparison.

For example, you would use an ordinal sort to organize the names of files, processes, mutexes, or named pipes.

For a comparison that involves a security decision such as whether a username is valid , you should always perform an ordinal test for equality by calling an overload of the Equals method.

The culture-sensitive sorting and casing rules used in string comparison depend on the version of the.

En el. In the. On other Windows operating systems, it conforms to the Unicode 5. NET Core, it depends on the version of the Unicode Standard supported by the underlying operating system.

For more information about word, string, and ordinal sort rules, see the System. CompareOptions topic. For additional recommendations on when to use each rule, see Best Practices for Using Strings.

Ordinarily, you don't call string comparison methods such as Compare directly to determine the sort order of strings. Instead, comparison methods are called by sorting methods such as Array.

The following example performs four different sorting operations word sort using the current culture, word sort using the invariant culture, ordinal sort, and string sort using the invariant culture without explicitly calling a string comparison method, although they do specify the type of comparison to use.

Note that each type of sort produces a unique ordering of strings in its array. NET uses sort keys to support culturally sensitive string comparison.

Each character in a string is given several categories of sort weights, including alphabetic, case, and diacritic. A sort key, represented by the SortKey class, provides a repository of these weights for a particular string.

If your app performs a large number of searching or sorting operations on the same set of strings, you can improve its performance by generating and storing sort keys for all the strings that it uses.

When a sort or comparison operation is required, you use the sort keys instead of the strings. For more information, see the SortKey class.

If you don't specify a string comparison convention, sorting methods such as Array. Sort Array perform a culture-sensitive, case-sensitive sort on strings.

The following example illustrates how changing the current culture affects the order of sorted strings in an array. Crea una matriz de tres cadenas.

It creates an array of three strings. En primer lugar, se establece la propiedad System. Sort Array. First, it sets the System. CurrentCulture property to en-US and calls the Array.

Sort Array method. The resulting sort order is based on sorting conventions for the English United States culture. Next, the example sets the System.

CurrentCulture property to da-DK and calls the Array. Sort method again. Notice how the resulting sort order differs from the en-US results because it uses the sorting conventions for Danish Denmark.

If your primary purpose in comparing strings is to determine whether they are equal, you should call the String. Equals method. Typically, you should use Equals to perform an ordinal comparison.

The String. Compare method is intended primarily to sort strings. StartsWith y String. String search methods, such as String. StartsWith and String.

IndexOf , also can perform culture-sensitive or ordinal string comparisons. The following example illustrates the differences between ordinal and culture-sensitive comparisons using the IndexOf method.

An ordinal search, on the other hand, does not find a match in either case. IndexOf , also can perform culture-sensitive or ordinal string comparisons to determine whether a character or substring is found in a specified string.

The search methods in the String class that search for an individual character, such as the IndexOf method, or one of a set of characters, such as the IndexOfAny method, all perform an ordinal search.

LastIndexOf String, Char. To perform a culture-sensitive search for a character, you must call a CompareInfo method such as CompareInfo.

Note that the results of searching for a character using ordinal and culture-sensitive comparison can be very different. IndexOf Char y CompareInfo.

The following example illustrates the difference between the String. IndexOf Char and CompareInfo. IndexOf String, Char methods when searching for an individual character.

On the other hand, String class methods that search for a string rather than a character perform a culture-sensitive search if search options are not explicitly specified by a parameter of type StringComparison.

The sole exception is Contains , which performs an ordinal search. Use the String. Compare method to determine the relationship of two strings in the sort order.

Typically, this is a culture-sensitive operation. Equals para comprobar la igualdad. In contrast, call the String. Equals method to test for equality.

Because the test for equality usually compares user input with some known string, such as a valid user name, a password, or a file system path, it is typically an ordinal operation.

Compare y determinando si el valor devuelto es cero. It is possible to test for equality by calling the String. Compare method and determining whether the return value is zero.

However, this practice is not recommended. To determine whether two strings are equal, you should call one of the overloads of the String. The preferred overload to call is either the instance Equals String, StringComparison method or the static Equals String, String, StringComparison method, because both methods include a System.

StringComparison parameter that explicitly specifies the type of comparison. The following example illustrates the danger of performing a culture-sensitive comparison for equality when an ordinal one should be used instead.

Como resultado, se permite el acceso al sistema de archivos de forma inadvertida. As a result, file system access is inadvertently permitted.

On the other hand, if an ordinal comparison is performed, the comparison for equality succeeds, and file system access is denied.

Algunos caracteres Unicode tienen varias representaciones. Some Unicode characters have multiple representations.

Multiple representations for a single character complicate searching, sorting, matching, and other string operations. The Unicode standard defines a process called normalization that returns one binary representation of a Unicode character for any of its equivalent binary representations.

Normalization can use several algorithms, called normalization forms, that follow different rules. When strings have been normalized to the same normalization form, they can be compared by using ordinal comparison.

An ordinal comparison is a binary comparison of the Unicode scalar value of corresponding Char objects in each string.

The method performs an ordinal comparison if you supply a value of StringComparison. Ordinal or OrdinalIgnoreCase for this parameter.

The overloads of the CompareOrdinal method. Methods that use ordinal comparison by default, such as Contains , Replace , and Split.

Methods that search for a Char value or for the elements in a Char array in a string instance.

You can determine whether a string is normalized to normalization form C by calling the String. IsNormalized method, or you can call the String.

IsNormalized NormalizationForm method to determine whether a string is normalized to a specified normalization form. You can also call the String.

Normalize method to convert a string to normalization form C, or you can call the String. Normalize NormalizationForm method to convert a string to a specified normalization form.

For step-by-step information about normalizing and comparing strings, see the Normalize and Normalize NormalizationForm methods.

The following simple example illustrates string normalization. It then converts each string to the supported normalization forms, and again performs an ordinal comparison of each string in a specified normalization form.

En cada caso, la segunda prueba de igualdad muestra que las cadenas son iguales. In each case, the second test for equality shows that the strings are equal.

For more information about normalization and normalization forms, see System. La clase String proporciona miembros para comparar cadenas, probar cadenas para la igualdad, buscar caracteres o subcadenas en una cadena, modificar una cadena, extraer subcadenas de una cadena, combinar cadenas, aplicar formato a valores, copiar una cadena y normalizar una cadena.

The String class provides members for comparing strings, testing strings for equality, finding characters or substrings in a string, modifying a string, extracting substrings from a string, combining strings, formatting values, copying a string, and normalizing a string.

Compare returns an integer that indicates the relationship of one string to a second string in the sort order. CompareOrdinal returns an integer that indicates the relationship of one string to a second string based on a comparison of their code points.

CompareTo returns an integer that indicates the relationship of the current string instance to a second string in the sort order.

You call the Equals method to determine whether two strings are equal. The instance Equals String, String, StringComparison and the static Equals String, StringComparison overloads let you specify whether the comparison is culture-sensitive or ordinal, and whether case is considered or ignored.

Most tests for equality are ordinal, and comparisons for equality that determine access to a system resource such as a file system object should always be ordinal.

Methods that return a Boolean value to indicate whether a particular substring is present in a string instance. Methods that indicate the starting position of a substring in a string instance.

If you want to search a string for a particular pattern rather than a specific substring, you should use regular expressions.

For more information, see. NET Regular Expressions. Insert inserta una cadena en la instancia de String actual. Insert inserts a string into the current String instance.

PadLeft inserts one or more occurrences of a specified character at the beginning of a string. PadRight inserts one or more occurrences of a specified character at the end of a string.

Remove elimina una subcadena de la instancia de String actual. Remove deletes a substring from the current String instance. Replace reemplaza una subcadena por otra subcadena de la instancia de String actual.

Replace replaces a substring with another substring in the current String instance. ToLower and ToLowerInvariant convert all the characters in a string to lowercase.

ToUpper and ToUpperInvariant convert all the characters in a string to uppercase. Trim removes all occurrences of a character from the beginning and end of a string.

TrimEnd removes all occurrences of a character from the end of a string. TrimStart removes all occurrences of a character from the beginning of a string.

All string modification methods return a new String object. No modifican el valor de la instancia actual.

They don't modify the value of the current instance. Split separa una sola cadena en varias cadenas. Split method separates a single string into multiple strings.

Overloads of the method allow you to specify multiple delimiters, to determine the maximum number of substrings that the method extracts, and to determine whether empty strings which occur when delimiters are adjacent are included among the returned strings.

Concat combines one or more substrings into a single string. Join concatenates one or more substrings into a single element and adds a separator between each substring.

Format method uses the composite formatting feature to replace one or more placeholders in a string with the string representation of some object or value.

To embed the string representation of a numeric value in a string. To embed the string representation of a date and time value in a string.

To embed the string representation of an enumeration value in a string. To embed the string representation of some object that supports the IFormattable interface in a string.

To right-justify or left-justify a substring in a field within a larger string. For detailed information about formatting operations and examples, see the Format overload summary.

Clone devuelve una referencia a un objeto String existente. Clone returns a reference to an existing String object. Copy crea una copia de una cadena existente.

Copy creates a copy of an existing string. CopyTo copia una parte de una cadena en una matriz de caracteres. CopyTo copies a portion of a string to a character array.

In Unicode, a single character can have multiple code points. Normalization converts these equivalent characters into the same binary representation.

Normalize method performs the normalization, and the String. IsNormalized method determines whether a string is normalized.

For more information and an example, see the Normalization section earlier in this topic. Inicializa una nueva instancia de la clase String con el valor indicado por un puntero especificado que apunta a una matriz de caracteres Unicode.

Initializes a new instance of the String class to the value indicated by a specified pointer to an array of Unicode characters.

Initializes a new instance of the String class to the value indicated by a specified pointer to an array of Unicode characters, a starting character position within that array, and a length.

Initializes a new instance of the String class to the value indicated by a specified Unicode character repeated a specified number of times.

Inicializa una nueva instancia de la clase String en el valor de caracteres Unicode indicado en la matriz de caracteres especificada.

Initializes a new instance of the String class to the Unicode characters indicated in the specified character array. Initializes a new instance of the String class to the value indicated by an array of Unicode characters, a starting character position within that array, and a length.

Inicializa una nueva instancia de la clase String en el valor de caracteres Unicode indicado en el intervalo de solo lectura especificado.

Initializes a new instance of the String class to the Unicode characters indicated in the specified read-only span.

Inicializa una nueva instancia de la clase String con el valor indicado por un puntero a una matriz de enteros de 8 bits con signo. Initializes a new instance of the String class to the value indicated by a pointer to an array of 8-bit signed integers.

Initializes a new instance of the String class to the value indicated by a specified pointer to an array of 8-bit signed integers, a starting position within that array, and a length.

Initializes a new instance of the String class to the value indicated by a specified pointer to an array of 8-bit signed integers, a starting position within that array, a length, and an Encoding object.

Represents the empty string. Este campo es de solo lectura. This field is read-only. Gets the Char object at a specified position in the current String object.

Gets the number of characters in the current String object. Devuelve una referencia a la instancia de String. Returns a reference to this instance of String.

Compares substrings of two specified String objects and returns an integer that indicates their relative position in the sort order.

Compares substrings of two specified String objects, ignoring or honoring their case, and returns an integer that indicates their relative position in the sort order.

Compares substrings of two specified String objects, ignoring or honoring their case and using culture-specific information to influence the comparison, and returns an integer that indicates their relative position in the sort order.

Compares substrings of two specified String objects using the specified comparison options and culture-specific information to influence the comparison, and returns an integer that indicates the relationship of the two substrings to each other in the sort order.

Compares substrings of two specified String objects using the specified rules, and returns an integer that indicates their relative position in the sort order.

Compares two specified String objects and returns an integer that indicates their relative position in the sort order.

Compares two specified String objects, ignoring or honoring their case, and returns an integer that indicates their relative position in the sort order.

Compares two specified String objects, ignoring or honoring their case, and using culture-specific information to influence the comparison, and returns an integer that indicates their relative position in the sort order.

Compares two specified String objects using the specified comparison options and culture-specific information to influence the comparison, and returns an integer that indicates the relationship of the two strings to each other in the sort order.

Compares two specified String objects using the specified rules, and returns an integer that indicates their relative position in the sort order. Compares substrings of two specified String objects by evaluating the numeric values of the corresponding Char objects in each substring.

Compares two specified String objects by evaluating the numeric values of the corresponding Char objects in each string. Compares this instance with a specified Object and indicates whether this instance precedes, follows, or appears in the same position in the sort order as the specified Object.

Compares this instance with a specified String object and indicates whether this instance precedes, follows, or appears in the same position in the sort order as the specified string.

Creates the string representation of a specified object. Concatena las representaciones de cadena de dos objetos especificados. Concatenates the string representations of two specified objects.

Concatena las representaciones de cadena de tres objetos especificados. Concatenates the string representations of three specified objects.

Concatenates the string representations of four specified objects and any objects specified in an optional variable length parameter list.

Concatena las representaciones de cadena de los elementos de una matriz Object especificada. Concatenates the string representations of the elements in a specified Object array.

Concatena las representaciones de cadena de dos intervalos especificados de caracteres de solo lectura. Concatenates the string representations of two specified read-only character spans.

Concatena las representaciones de cadena de tres intervalos especificados de caracteres de solo lectura. Concatenates the string representations of three specified read-only character spans.

Concatena las representaciones de cadena de cuatro intervalos especificados de caracteres de solo lectura. Concatenates the string representations of four specified read-only character spans.

Concatena dos instancias de String especificadas. Concatenates two specified instances of String. Concatena tres instancias de String especificadas.

Concatenates three specified instances of String. Concatena cuatro instancias de String especificadas. Concatenates four specified instances of String.

Concatena los elementos en una matriz String especificada. Concatenates the elements of a specified String array.

Returns a value indicating whether a specified character occurs within this string. Returns a value indicating whether a specified character occurs within this string, using the specified comparison rules.

Devuelve un valor que indica si una subcadena especificada aparece dentro de esta cadena. Returns a value indicating whether a specified substring occurs within this string.

Returns a value indicating whether a specified string occurs within this string, using the specified comparison rules.

Crea una nueva instancia de String con el mismo valor que una String especificada. Creates a new instance of String with the same value as a specified String.

Copies a specified number of characters from a specified position in this instance to a specified position in an array of Unicode characters. Creates a new string with a specific length and initializes it after creation by using the specified callback.

Determines whether the end of this string instance matches the specified character. Determina si el final de esta instancia de cadena coincide con la cadena especificada.

Determines whether the end of this string instance matches the specified string. Determina si el final de esta instancia de cadena coincide con la cadena especificada cuando se comparan usando la referencia cultural especificada.

Determines whether the end of this string instance matches the specified string when compared using the specified culture.

Determines whether the end of this string instance matches the specified string when compared using the specified comparison option. Returns an enumeration of Rune from this string.

Determines whether this instance and a specified object, which must also be a String object, have the same value. Determina si esta instancia y otro objeto String especificado tienen el mismo valor.

Determines whether this instance and another specified String object have the same value. Determina si dos objetos String especificados tienen el mismo valor.

Determines whether two specified String objects have the same value. A parameter specifies the culture, case, and sort rules used in the comparison.

Determina si esta cadena y un objeto String especificado tienen el mismo valor. Determines whether this string and a specified String object have the same value.

Replaces the format item or items in a specified string with the string representation of the corresponding object.

A parameter supplies culture-specific formatting information. Replaces the format items in a string with the string representation of two specified objects.

Replaces the format items in a string with the string representation of three specified objects. An parameter supplies culture-specific formatting information.

Reemplaza los elementos de formato de una cadena por las representaciones de cadena de los objetos correspondientes en una matriz especificada. Replaces the format items in a string with the string representations of corresponding objects in a specified array.

Replaces one or more format items in a string with the string representation of a specified object. Replaces the format item in a specified string with the string representation of a corresponding object in a specified array.

Retrieves an object that can iterate through the individual characters in this string. Returns the hash code for this string.

Returns the hash code for the provided read-only character span. Returns the hash code for the provided read-only character span using the specified rules.

Returns the hash code for this string using the specified rules. Returns a reference to the element of the string at index zero. Obtiene el Type de la instancia actual.

Gets the Type of the current instance. Devuelve la instancia de TypeCode para la clase String. Returns the TypeCode for the String class.

Reports the zero-based index of the first occurrence of the specified Unicode character in this string. The search starts at a specified character position.

Reports the zero-based index of the first occurrence of the specified character in this instance. The search starts at a specified character position and examines a specified number of character positions.

An ordinal search, on the other hand, does not find a match in either case. IndexOf , also can perform culture-sensitive or ordinal string comparisons to determine whether a character or substring is found in a specified string.

The search methods in the String class that search for an individual character, such as the IndexOf method, or one of a set of characters, such as the IndexOfAny method, all perform an ordinal search.

To perform a culture-sensitive search for a character, you must call a CompareInfo method such as CompareInfo.

LastIndexOf String, Char. Note that the results of searching for a character using ordinal and culture-sensitive comparison can be very different.

The following example illustrates the difference between the String. IndexOf Char and CompareInfo. IndexOf String, Char methods when searching for an individual character.

On the other hand, String class methods that search for a string rather than a character perform a culture-sensitive search if search options are not explicitly specified by a parameter of type StringComparison.

The sole exception is Contains , which performs an ordinal search. Use the String. Compare method to determine the relationship of two strings in the sort order.

Typically, this is a culture-sensitive operation. In contrast, call the String. Equals method to test for equality. Because the test for equality usually compares user input with some known string, such as a valid user name, a password, or a file system path, it is typically an ordinal operation.

It is possible to test for equality by calling the String. Compare method and determining whether the return value is zero.

However, this practice is not recommended. To determine whether two strings are equal, you should call one of the overloads of the String. The preferred overload to call is either the instance Equals String, StringComparison method or the static Equals String, String, StringComparison method, because both methods include a System.

StringComparison parameter that explicitly specifies the type of comparison. The following example illustrates the danger of performing a culture-sensitive comparison for equality when an ordinal one should be used instead.

As a result, file system access is inadvertently permitted. On the other hand, if an ordinal comparison is performed, the comparison for equality succeeds, and file system access is denied.

Some Unicode characters have multiple representations. Multiple representations for a single character complicate searching, sorting, matching, and other string operations.

The Unicode standard defines a process called normalization that returns one binary representation of a Unicode character for any of its equivalent binary representations.

Normalization can use several algorithms, called normalization forms, that follow different rules. When strings have been normalized to the same normalization form, they can be compared by using ordinal comparison.

An ordinal comparison is a binary comparison of the Unicode scalar value of corresponding Char objects in each string. The String class includes a number of methods that can perform an ordinal comparison, including the following:.

The method performs an ordinal comparison if you supply a value of StringComparison. Ordinal or OrdinalIgnoreCase for this parameter. The overloads of the CompareOrdinal method.

Methods that use ordinal comparison by default, such as Contains , Replace , and Split. Methods that search for a Char value or for the elements in a Char array in a string instance.

You can determine whether a string is normalized to normalization form C by calling the String. IsNormalized method, or you can call the String.

IsNormalized NormalizationForm method to determine whether a string is normalized to a specified normalization form.

You can also call the String. Normalize method to convert a string to normalization form C, or you can call the String. Normalize NormalizationForm method to convert a string to a specified normalization form.

For step-by-step information about normalizing and comparing strings, see the Normalize and Normalize NormalizationForm methods.

The following simple example illustrates string normalization. It then converts each string to the supported normalization forms, and again performs an ordinal comparison of each string in a specified normalization form.

In each case, the second test for equality shows that the strings are equal. For more information about normalization and normalization forms, see System.

The String class provides members for comparing strings, testing strings for equality, finding characters or substrings in a string, modifying a string, extracting substrings from a string, combining strings, formatting values, copying a string, and normalizing a string.

You can compare strings to determine their relative position in the sort order by using the following String methods:.

Compare returns an integer that indicates the relationship of one string to a second string in the sort order. CompareOrdinal returns an integer that indicates the relationship of one string to a second string based on a comparison of their code points.

CompareTo returns an integer that indicates the relationship of the current string instance to a second string in the sort order.

You call the Equals method to determine whether two strings are equal. The instance Equals String, String, StringComparison and the static Equals String, StringComparison overloads let you specify whether the comparison is culture-sensitive or ordinal, and whether case is considered or ignored.

Most tests for equality are ordinal, and comparisons for equality that determine access to a system resource such as a file system object should always be ordinal.

The String class includes two kinds of search methods:. Methods that return a Boolean value to indicate whether a particular substring is present in a string instance.

Methods that indicate the starting position of a substring in a string instance. If you want to search a string for a particular pattern rather than a specific substring, you should use regular expressions.

For more information, see. NET Regular Expressions. The String class includes the following methods that appear to modify the value of a string:.

Insert inserts a string into the current String instance. PadLeft inserts one or more occurrences of a specified character at the beginning of a string.

PadRight inserts one or more occurrences of a specified character at the end of a string. Remove deletes a substring from the current String instance.

Replace replaces a substring with another substring in the current String instance. ToLower and ToLowerInvariant convert all the characters in a string to lowercase.

ToUpper and ToUpperInvariant convert all the characters in a string to uppercase. Trim removes all occurrences of a character from the beginning and end of a string.

TrimEnd removes all occurrences of a character from the end of a string. TrimStart removes all occurrences of a character from the beginning of a string.

All string modification methods return a new String object. They don't modify the value of the current instance. Split method separates a single string into multiple strings.

Overloads of the method allow you to specify multiple delimiters, to determine the maximum number of substrings that the method extracts, and to determine whether empty strings which occur when delimiters are adjacent are included among the returned strings.

The following String methods can be used for string concatenation:. Concat combines one or more substrings into a single string.

Join concatenates one or more substrings into a single element and adds a separator between each substring. Format method uses the composite formatting feature to replace one or more placeholders in a string with the string representation of some object or value.

The Format method is often used to do the following:. To embed the string representation of some object that supports the IFormattable interface in a string.

For detailed information about formatting operations and examples, see the Format overload summary. You can call the following String methods to make a copy of a string:.

Clone returns a reference to an existing String object. Copy creates a copy of an existing string. CopyTo copies a portion of a string to a character array.

In Unicode, a single character can have multiple code points. Normalization converts these equivalent characters into the same binary representation.

Normalize method performs the normalization, and the String. IsNormalized method determines whether a string is normalized.

For more information and an example, see the Normalization section earlier in this topic. Initializes a new instance of the String class to the value indicated by a specified pointer to an array of Unicode characters.

Initializes a new instance of the String class to the value indicated by a specified pointer to an array of Unicode characters, a starting character position within that array, and a length.

Initializes a new instance of the String class to the value indicated by a specified Unicode character repeated a specified number of times. Initializes a new instance of the String class to the Unicode characters indicated in the specified character array.

Initializes a new instance of the String class to the value indicated by an array of Unicode characters, a starting character position within that array, and a length.

Initializes a new instance of the String class to the Unicode characters indicated in the specified read-only span.

Initializes a new instance of the String class to the value indicated by a pointer to an array of 8-bit signed integers.

Initializes a new instance of the String class to the value indicated by a specified pointer to an array of 8-bit signed integers, a starting position within that array, and a length.

Initializes a new instance of the String class to the value indicated by a specified pointer to an array of 8-bit signed integers, a starting position within that array, a length, and an Encoding object.

Gets the Char object at a specified position in the current String object. Gets the number of characters in the current String object. Returns a reference to this instance of String.

Compares substrings of two specified String objects and returns an integer that indicates their relative position in the sort order.

Compares substrings of two specified String objects, ignoring or honoring their case, and returns an integer that indicates their relative position in the sort order.

Compares substrings of two specified String objects, ignoring or honoring their case and using culture-specific information to influence the comparison, and returns an integer that indicates their relative position in the sort order.

Compares substrings of two specified String objects using the specified comparison options and culture-specific information to influence the comparison, and returns an integer that indicates the relationship of the two substrings to each other in the sort order.

Compares substrings of two specified String objects using the specified rules, and returns an integer that indicates their relative position in the sort order.

Compares two specified String objects and returns an integer that indicates their relative position in the sort order.

Compares two specified String objects, ignoring or honoring their case, and returns an integer that indicates their relative position in the sort order.

Compares two specified String objects, ignoring or honoring their case, and using culture-specific information to influence the comparison, and returns an integer that indicates their relative position in the sort order.

Compares two specified String objects using the specified comparison options and culture-specific information to influence the comparison, and returns an integer that indicates the relationship of the two strings to each other in the sort order.

Compares two specified String objects using the specified rules, and returns an integer that indicates their relative position in the sort order. Compares substrings of two specified String objects by evaluating the numeric values of the corresponding Char objects in each substring.

Compares two specified String objects by evaluating the numeric values of the corresponding Char objects in each string. Compares this instance with a specified Object and indicates whether this instance precedes, follows, or appears in the same position in the sort order as the specified Object.

Compares this instance with a specified String object and indicates whether this instance precedes, follows, or appears in the same position in the sort order as the specified string.

Concatenates the string representations of four specified objects and any objects specified in an optional variable length parameter list.

Concatenates the string representations of the elements in a specified Object array. Concatenates two specified instances of String.

Concatenates three specified instances of String. Concatenates four specified instances of String. Concatenates the elements of a specified String array.

Returns a value indicating whether a specified character occurs within this string, using the specified comparison rules.

Returns a value indicating whether a specified string occurs within this string, using the specified comparison rules. Creates a new instance of String with the same value as a specified String.

Copies a specified number of characters from a specified position in this instance to a specified position in an array of Unicode characters.

Creates a new string with a specific length and initializes it after creation by using the specified callback.

Determines whether the end of this string instance matches the specified string when compared using the specified culture. Determines whether the end of this string instance matches the specified string when compared using the specified comparison option.

Returns an enumeration of Rune from this string. Determines whether this instance and a specified object, which must also be a String object, have the same value.

Determines whether this instance and another specified String object have the same value. Determines whether two specified String objects have the same value.

A parameter specifies the culture, case, and sort rules used in the comparison. Determines whether this string and a specified String object have the same value.

Replaces the format item or items in a specified string with the string representation of the corresponding object. A parameter supplies culture-specific formatting information.

Replaces the format items in a string with the string representation of two specified objects. Replaces the format items in a string with the string representation of three specified objects.

An parameter supplies culture-specific formatting information. Replaces the format items in a string with the string representations of corresponding objects in a specified array.

Replaces one or more format items in a string with the string representation of a specified object. Replaces the format item in a specified string with the string representation of a corresponding object in a specified array.

Gets the Type of the current instance. Returns the TypeCode for the String class. Reports the zero-based index of the first occurrence of the specified Unicode character in this string.

The search starts at a specified character position. Reports the zero-based index of the first occurrence of the specified character in this instance.

The search starts at a specified character position and examines a specified number of character positions.

A parameter specifies the type of search to use for the specified character. Reports the zero-based index of the first occurrence of the specified string in this instance.

Reports the zero-based index of the first occurrence of the specified string in the current String object.

Parameters specify the starting search position in the current string, the number of characters in the current string to search, and the type of search to use for the specified string.

Parameters specify the starting search position in the current string and the type of search to use for the specified string. A parameter specifies the type of search to use for the specified string.

Reports the zero-based index of the first occurrence in this instance of any character in a specified array of Unicode characters.

Returns a new string in which a specified string is inserted at a specified index position in this instance. Retrieves the system's reference to the specified String.

Retrieves a reference to a specified String. Indicates whether the specified string is null or an empty string "". Indicates whether a specified string is null , empty, or consists only of white-space characters.

Concatenates the string representations of an array of objects, using the specified separator between each member. Concatenates an array of strings, using the specified separator between each member, starting with the element in value located at the startIndex position, and concatenating up to count elements.

Concatenates the elements of an object array, using the specified separator between each element. Concatenates all the elements of a string array, using the specified separator between each element.

Concatenates the specified elements of a string array, using the specified separator between each element. Reports the zero-based index position of the last occurrence of a specified Unicode character within this instance.

The search starts at a specified character position and proceeds backward toward the beginning of the string.

Reports the zero-based index position of the last occurrence of the specified Unicode character in a substring within this instance.

The search starts at a specified character position and proceeds backward toward the beginning of the string for a specified number of character positions.

Reports the zero-based index position of the last occurrence of a specified string within this instance.

The search starts at a specified character position and proceeds backward toward the beginning of the string for the specified number of character positions.

A parameter specifies the type of comparison to perform when searching for the specified string. Reports the zero-based index of the last occurrence of a specified string within the current String object.

Reports the zero-based index position of the last occurrence in this instance of one or more characters specified in a Unicode array.

Creates a shallow copy of the current Object. Returns a new string whose textual value is the same as this string, but whose binary representation is in Unicode normalization form C.

Returns a new string whose textual value is the same as this string, but whose binary representation is in the specified Unicode normalization form.

Returns a new string that right-aligns the characters in this instance by padding them with spaces on the left, for a specified total length.

Returns a new string that right-aligns the characters in this instance by padding them on the left with a specified Unicode character, for a specified total length.

Returns a new string that left-aligns the characters in this string by padding them with spaces on the right, for a specified total length.

Returns a new string that left-aligns the characters in this string by padding them on the right with a specified Unicode character, for a specified total length.

Returns a new string in which all the characters in the current instance, beginning at a specified position and continuing through the last position, have been deleted.

Returns a new string in which a specified number of characters in the current instance beginning at a specified position have been deleted.

Returns a new string in which all occurrences of a specified Unicode character in this instance are replaced with another specified Unicode character.

Returns a new string in which all occurrences of a specified string in the current instance are replaced with another specified string. Returns a new string in which all occurrences of a specified string in the current instance are replaced with another specified string, using the provided culture and case sensitivity.

Returns a new string in which all occurrences of a specified string in the current instance are replaced with another specified string, using the provided comparison type.

Splits a string into a maximum number of substrings based on the characters in an array. You also specify the maximum number of substrings to return.

Splits a string into substrings based on the characters in an array. You can specify whether the substrings include empty array elements.

Splits a string into a maximum number of substrings based on the strings in an array. Splits a string into substrings based on the strings in an array.

Determines whether the beginning of this string instance matches the specified string when compared using the specified culture. Determines whether the beginning of this string instance matches the specified string when compared using the specified comparison option.

Retrieves a substring from this instance. The substring starts at a specified character position and continues to the end of the string. The substring starts at a specified character position and has a specified length.

Returns a copy of this string converted to lowercase, using the casing rules of the specified culture. Returns a copy of this String object converted to lowercase using the casing rules of the invariant culture.

Returns this instance of String ; no actual conversion is performed. Returns a copy of this string converted to uppercase, using the casing rules of the specified culture.

Returns a copy of this String object converted to uppercase using the casing rules of the invariant culture. Removes all leading and trailing occurrences of a set of characters specified in an array from the current string.

Removes all the trailing occurrences of a set of characters specified in an array from the current string. Removes all the leading occurrences of a set of characters specified in an array from the current string.

Returns an enumerator that iterates through the current String object. Constructs an immutable dictionary from an existing collection of elements, applying a transformation function to the source keys.

Enumerates and transforms a sequence, and produces an immutable dictionary of its contents by using the specified key comparer.

Enumerates and transforms a sequence, and produces an immutable dictionary of its contents by using the specified key and value comparers.

Enumerates a sequence, produces an immutable hash set of its contents, and uses the specified equality comparer for the set type.

Enumerates and transforms a sequence, and produces an immutable sorted dictionary of its contents. Enumerates and transforms a sequence, and produces an immutable sorted dictionary of its contents by using the specified key comparer.

Enumerates and transforms a sequence, and produces an immutable sorted dictionary of its contents by using the specified key and value comparers.

Enumerates a sequence, produces an immutable sorted set of its contents, and uses the specified comparer.

Applies an accumulator function over a sequence. The specified seed value is used as the initial accumulator value. The specified seed value is used as the initial accumulator value, and the specified function is used to select the result value.

Computes the average of a sequence of Decimal values that are obtained by invoking a transform function on each element of the input sequence. Computes the average of a sequence of Double values that are obtained by invoking a transform function on each element of the input sequence.

Computes the average of a sequence of Int32 values that are obtained by invoking a transform function on each element of the input sequence.

Computes the average of a sequence of Int64 values that are obtained by invoking a transform function on each element of the input sequence.

Computes the average of a sequence of nullable Decimal values that are obtained by invoking a transform function on each element of the input sequence.

Computes the average of a sequence of nullable Double values that are obtained by invoking a transform function on each element of the input sequence.

Computes the average of a sequence of nullable Int32 values that are obtained by invoking a transform function on each element of the input sequence.

Computes the average of a sequence of nullable Int64 values that are obtained by invoking a transform function on each element of the input sequence.

Computes the average of a sequence of nullable Single values that are obtained by invoking a transform function on each element of the input sequence.

Computes the average of a sequence of Single values that are obtained by invoking a transform function on each element of the input sequence.

Casts the elements of an IEnumerable to the specified type. Determines whether a sequence contains a specified element by using the default equality comparer.

Returns a number that represents how many elements in the specified sequence satisfy a condition. Returns the elements of the specified sequence or the type parameter's default value in a singleton collection if the sequence is empty.

Returns the elements of the specified sequence or the specified value in a singleton collection if the sequence is empty. Returns distinct elements from a sequence by using the default equality comparer to compare values.

Returns the element at a specified index in a sequence or a default value if the index is out of range. Produces the set difference of two sequences by using the default equality comparer to compare values.

The contents of the string builder are copied; subsequent modification of the string builder does not affect the newly created string. Postcode Lotterie Betrug can use the StringBuilder class instead FuГџball Polen Irland the String class StГјtzig Tipico Schein that make multiple changes to the value of a string. Obtaining a string from a string builder via the toString method is likely to run faster and is generally preferred. An index is a zero-based, nonnegative number that starts from the first position in the string, which Skin Area Csgo index position zero. LastIndexOf Char, Int For more information about working with units of text rather than individual Char values, see Introduction to character encoding Flash Testen.

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