Char.IsSymbol Method (String, Int32)

Syntax

'Declaration
Public Shared Function IsSymbol ( _
    s As String, _
    index As Integer _
) As Boolean

public static bool IsSymbol(
    string s,
    int index
)

Exceptions

Remarks

Character positions in a string are indexed starting from zero.

Valid symbols are members of the following categories in System.Globalization.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.

See Also

Reference