Parse Methode (Type, String)
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Enum.Parse-Methode (Type, String)

 

Konvertiert die Zeichenfolgendarstellung des Namens oder des numerischen Werts einer oder mehrerer Enumerationskonstanten in ein entsprechendes Enumerationsobjekt.

Namespace:   System
Assembly:  mscorlib (in mscorlib.dll)

[ComVisibleAttribute(true)]
public static object Parse(
	Type enumType,
	string value
)

Parameter

enumType

Ein Enumerationstyp.

value

Eine Zeichenfolge mit dem zu konvertierenden Namen oder Wert.

Rückgabewert

Type: System.Object

Ein Objekt vom Typ enumType, dessen Wert durch value dargestellt wird.

Exception Condition
ArgumentNullException

enumType or value is null.

ArgumentException

enumType is not an Enum.

-or-

value is either an empty string or only contains white space.

-or-

value is a name, but not one of the named constants defined for the enumeration.

OverflowException

value is outside the range of the underlying type of enumType.

The value parameter contains the string representation of an enumeration member's underlying value or named constant, or a list of named constants delimited by commas (,).One or more blank spaces can precede or follow each value, name, or comma in value.If value is a list, the return value is the value of the specified names combined with a bitwise OR operation.

If value is a name that does not correspond to a named constant of enumType, the method throws an ArgumentException.If value is the string representation of an integer that does not represent an underlying value of the enumType enumeration, the method returns an enumeration member whose underlying value is value converted to an integral type.If this behavior is undesirable, call the IsDefined method to ensure that a particular string representation of an integer is actually a member of enumType.The following example defines a Colors enumeration, calls the Parse(Type, String) method to convert strings to their corresponding enumeration values, and calls the IsDefined method to ensure that particular integral values are underlying values in the Colors enumeration.

using System;

[Flags] enum Colors { None=0, Red = 1, Green = 2, Blue = 4 };

public class Example
{
   public static void Main()
   {
      string[] colorStrings = { "0", "2", "8", "blue", "Blue", "Yellow", "Red, Green" };
      foreach (string colorString in colorStrings)
      {
         try {
            Colors colorValue = (Colors) Enum.Parse(typeof(Colors), colorString);        
            if (Enum.IsDefined(typeof(Colors), colorValue) | colorValue.ToString().Contains(","))  
               Console.WriteLine("Converted '{0}' to {1}.", colorString, colorValue.ToString());
            else
               Console.WriteLine("{0} is not an underlying value of the Colors enumeration.", colorString);
         }
         catch (ArgumentException) {
            Console.WriteLine("'{0}' is not a member of the Colors enumeration.", colorString);
         }
      }
   }
}
// The example displays the following output:
//       Converted '0' to None.
//       Converted '2' to Green.
//       8 is not an underlying value of the Colors enumeration.
//       'blue' is not a member of the Colors enumeration.
//       Converted 'Blue' to Blue.
//       'Yellow' is not a member of the Colors enumeration.
//       Converted 'Red, Green' to Red, Green.

This operation is case-sensitive.

The following example uses the Parse(Type, String) method to parse an array of strings that are created by calling the GetNames method.It also uses the Parse(Type, String) method to parse an enumeration value that consists of a bit field.

using System;

public class ParseTest
{
    [FlagsAttribute]
    enum Colors { Red = 1, Green = 2, Blue = 4, Yellow = 8 };

    public static void Main()
    {
        Console.WriteLine("The entries of the Colors enumeration are:");
        foreach (string colorName in Enum.GetNames(typeof(Colors)))
        {
            Console.WriteLine("{0} = {1:D}", colorName, 
                                         Enum.Parse(typeof(Colors), colorName));
        }
        Console.WriteLine();

        Colors orange = (Colors) Enum.Parse(typeof(Colors), "Red, Yellow");
        Console.WriteLine("The orange value {0:D} has the combined entries of {0}", 
                           orange);
    }
}

/*
This code example produces the following results:

The entries of the Colors Enum are:
Red = 1
Green = 2
Blue = 4
Yellow = 8

The orange value 9 has the combined entries of Red, Yellow

*/

Universal Windows Platform
Verfügbar seit 4.5
.NET Framework
Verfügbar seit 1.1
Portable Class Library
Unterstützt in: portable .NET platforms
Windows Phone Silverlight
Verfügbar seit 8.0
Windows Phone
Verfügbar seit 8.1
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