IdnMapping.GetHashCode 方法

定义

命名空间:

System.Globalization

程序集:

System.Runtime.dll

Source:

IdnMapping.cs

返回此 IdnMapping 对象的哈希代码。

public:
 override int GetHashCode();

public override int GetHashCode ();

override this.GetHashCode : unit -> int

Public Overrides Function GetHashCode () As Integer

返回

Int32

从 IdnMapping 对象的属性派生的四个 32 位常量中的一个。 返回值没有特殊意义，不适合在哈希代码算法中使用。

示例

以下示例假定单个字符串可以包含多个用空格分隔的电子邮件地址。 它从每个电子邮件地址中删除本地部分和 @ 字符，并将生成的域名传递给 GetAscii(String, Int32) 或 GetAscii(String, Int32, Int32) 方法以创建 Punycode 域名。 然后， GetUnicode(String, Int32, Int32) 方法将 Punycode 域名转换回原始域名。

using System;
using System.Globalization;

public class Example
{
   public static void Main()
   {
      string email = "johann_doe@bücher.com john_doe@hotmail.com иван@мойдомен.рф";
      IdnMapping idn = new IdnMapping();
      int start = 0, end = 0;

      while (end >= 0) {
         start = email.IndexOf("@", end);
         end = email.IndexOf(" ", start);
         string domain = String.Empty;

         try {
            string punyCode = String.Empty;
            if (start >= 0 && end >= 0) {
               domain = email.Substring(start + 1, end - start - 1);
               punyCode = idn.GetAscii(email, start + 1, end - start - 1);
            }
            else {
               domain = email.Substring(start + 1);
               punyCode = idn.GetAscii(email, start + 1);
            }
            string name2 = idn.GetUnicode(punyCode);
            Console.WriteLine("{0} --> {1} --> {2}", domain, punyCode, name2);
         }
         catch (ArgumentException) {
            Console.WriteLine("{0} is not a valid domain name.", domain);
         }
         Console.WriteLine();
      }
   }
}
// The example displays the following output:
//       bücher.com --> xn--bcher-kva.com --> bücher.com
//
//       hotmail.com --> hotmail.com --> hotmail.com
//
//       мойдомен.рф --> xn--d1acklchcc.xn--p1ai --> мойдомен.рф

Imports System.Globalization

Module Example
   Public Sub Main()
      Dim email As String = "johann_doe@bücher.com john_doe@hotmail.com иван@мойдомен.рф"
      Dim idn As New IdnMapping()
      Dim start, [end] As Integer
      
      Do While [end] >= 0
         start = email.IndexOf("@", [end])
         [end] = email.IndexOf(" ", start)
         Dim domain As String = String.Empty
         
         Try
            Dim punyCode As String = String.Empty
            If start >= 0 And [end] >= 0 Then 
               domain = email.Substring(start + 1, [end] - start - 1)
               punyCode = idn.GetAscii(email, start + 1, [end] - start - 1)
            Else
               domain = email.Substring(start + 1)
               punyCode = idn.GetAscii(email, start + 1)
            End If
            Dim name2 As String = idn.GetUnicode(punyCode)
            Console.WriteLine("{0} --> {1} --> {2}", domain, punyCode, name2) 
         Catch e As ArgumentException 
            Console.WriteLine("{0} is not a valid domain name.", domain)
         End Try
         Console.WriteLine()
      Loop   
   End Sub
End Module
' The example displays the following output:
'       bücher.com --> xn--bcher-kva.com --> bücher.com
'       
'       hotmail.com --> hotmail.com --> hotmail.com
'       
'       мойдомен.рф --> xn--d1acklchcc.xn--p1ai --> мойдомен.рф

注解

如果应用程序需要实现有意义的哈希代码算法， GetHashCode 请重写 方法。