Uri.FromHex(Char) 方法

public:
 static int FromHex(char digit);

public static int FromHex(char digit);

static member FromHex : char -> int

Public Shared Function FromHex (digit As Char) As Integer

参数

返回

一个介于 0 到 15 之间的数字，对应于指定的十六进制数字。

例外

示例

以下示例确定字符是否为十六进制字符，如果是，则向控制台写入相应的十进制值。

char  testChar = 'e';
if (Uri.IsHexDigit(testChar))
    Console.WriteLine("'{0}' is the hexadecimal representation of {1}", testChar, Uri.FromHex(testChar));
else
    Console.WriteLine("'{0}' is not a hexadecimal character", testChar);

string returnString = Uri.HexEscape(testChar);
Console.WriteLine("The hexadecimal value of '{0}' is {1}", testChar, returnString);

let testChar = 'e'
if Uri.IsHexDigit testChar then
    printfn $"'{testChar}' is the hexadecimal representation of {Uri.FromHex testChar}"
else
    printfn $"'{testChar}' is not a hexadecimal character"

let returnString = Uri.HexEscape testChar
printfn $"The hexadecimal value of '{testChar}' is {returnString}"

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)

注解

该方法 FromHex 将表示十六进制数字（0-9、a-f、A-F）的字符转换为其十进制值（0 到 15）。 如果 digit 不是有效的十六进制数字， ArgumentException 则会引发异常。