Uri.IsHexDigit Method

Determines whether a specified character is a valid hexadecimal digit.

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

'Declaration
Public Shared Function IsHexDigit ( _
	character As Char _
) As Boolean

Parameters

character
Type: System.Char

The character to validate.

Return Value

Type: System.Boolean
A Boolean value that is true if the character is a valid hexadecimal digit; otherwise false.

Hexadecimal digits are the digits 0 to 9 and the letters A-F or a-f.

The following example determines whether a character is a hexadecimal character and, if it is, writes the corresponding decimal value to the console.

Dim testChar As Char = "e"c
If Uri.IsHexDigit(testChar) = True Then
    Console.WriteLine("'{0}' is the hexadecimal representation of {1}", testChar, Uri.FromHex(testChar))
Else
    Console.WriteLine("'{0}' is not a hexadecimal character", testChar)
End If  
Dim returnString As String = Uri.HexEscape(testChar)
Console.WriteLine("The hexadecimal value of '{0}' is {1}", testChar, returnString)

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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