Artikel
11/18/2011

Char.IsSymbol Method (Char)

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Indicates whether the specified Unicode character is categorized as a symbol character.

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

Syntax

'Declaration
Public Shared Function IsSymbol ( _
    c As Char _
) As Boolean

public static bool IsSymbol(
    char c
)

Parameters

c
Type: System.Char
A Unicode character.

Return Value

Type: System.Boolean
true if c is a symbol character; otherwise, false.

Remarks

Valid symbols are members of the following categories in UnicodeCategory: MathSymbol, CurrencySymbol, ModifierSymbol, and OtherSymbol.

Symbols in the Unicode standard are a loosely defined set of characters that include the following:

Currency symbols.
Letterlike symbols, which include a set of mathematical alphanumeric symbols, as well as such symbols as ℅, №, and ™.
Number forms, such as subscripts and superscripts.
Mathematical operators and arrows.
Geometric symbols.
Technical symbols.
Braille patterns.
Dingbats.

Examples

The following example demonstrates IsSymbol.


Module Example

   Public Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)

      Dim str As String
      str = "non-symbolic characters"

      outputBlock.Text &= Char.IsSymbol("+"c) & vbCrLf      ' Output: "True"
      outputBlock.Text += String.Format(Char.IsSymbol(str, 8)) & vbCrLf    ' Output: "False"

   End Sub

End Module

using System;

public class Example
{
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      string str = "non-symbolic characters";

      outputBlock.Text += Char.IsSymbol('+') + "\n";           // Output: "True"
      outputBlock.Text += Char.IsSymbol(str, 8) + "\n";        // Output: "False"
   }
}

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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