C# 生成MD5代码示例

来自：

using System;

public string CreateMD5Hash (string input)
{
   // Use input string to calculate MD5 hash
   MD5 md5 = System.Security.Cryptography.MD5.Create();
   byte[] inputBytes = System.Text.Encoding.ASCII.GetBytes (input);
   byte[] hashBytes  = md5.ComputeHash (inputBytes);

   // Convert the byte array to hexadecimal string
   StringBuilder sb = new StringBuilder();
   for (int i = 0; i < hashBytes.Length; i++)
   {
       sb.Append (hashBytes[i].ToString ("X2"));
       // To force the hex string to lower-case letters instead of
       // upper-case, use he following line instead:
       // sb.Append(hashBytes[i].ToString("x2")); 
   }
   return sb.ToString();
}

用法：  (备注：1,000,000数据执行时间为：00:00:23.8906620)

string md5hash = CreateMD5Hash("abcdefghijklmnopqrstuvwxyz");

执行结果 

md5hash will contain this string: "C3FCD3D76192E4007DFB496CCA67E13B".

C#里也可以直接使用System.Web.Security 命名空间 生成MD5(备注：1,000,000数据执行时间为：00:00:21.2057591)

FormsAuthentication.HashPasswordForStoringInConfigFile (string, "MD5")