MD5函数（公共方法）

 1  #region MD5函数
 2         /// <summary>
 3         /// MD5函数
 4         /// </summary>
 5         /// <param name="str">原始字符串</param>
 6         /// <returns>MD5结果</returns>
 7         public static string MD5(string str)
 8         {
 9             byte[] b = encoding.GetBytes(str);
10             b = new System.Security.Cryptography.MD5CryptoServiceProvider().ComputeHash(b);
11             string ret = "";
12             for (int i = 0; i < b.Length; i++)
13             {
14                 ret += b[i].ToString("x").PadLeft(2, '0');
15             }
16             return ret;
17         }
18 #endregion