IsDigit Method (Char)
Collapse the table of content
Expand the table of content

Char.IsDigit Method (Char)

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Indicates whether the specified Unicode character is categorized as a decimal digit.

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

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

Parameters

c
Type: System.Char
A Unicode character.

Return Value

Type: System.Boolean
true if c is a decimal digit; otherwise, false.

This method determines if a Char is a radix-10 digit. This contrasts with the IsNumber method, which determines if a Char is of any numeric Unicode category. Numbers include characters such as fractions, subscripts, superscripts, Roman numerals, currency numerators, encircled numbers, and script-specific digits.

Valid digits are members of the UnicodeCategory.DecimalDigitNumber category.

The following example demonstrates IsDigit.



Module Example

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

      Dim ch8 As Char
      ch8 = "8"c

      outputBlock.Text &= Char.IsDigit(ch8) & vbCrLf                    ' Output: "True"
      outputBlock.Text += String.Format(Char.IsDigit("sample string", 6)) & vbCrLf     ' Output: "False"

   End Sub

End Module


Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

Show:
© 2017 Microsoft