public string Get_MD5_Method1(string strSource)        {            System.Security.Cryptography.MD5 md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();            //获取密文字节数组             byte[] bytResult = md5.ComputeHash(System.Text.Encoding.Default.GetBytes(strSource));            //转换成字符串，并取9到25位             string strResult = BitConverter.ToString(bytResult, 4, 8);            //转换成字符串，32位             //string strResult = BitConverter.ToString(bytResult);             //BitConverter转换出来的字符串会在每个字符中间产生一个分隔符，需要去除掉             strResult = strResult.Replace("-", "");            return strResult;         }--------------------------------------------第二种  public string Get_MD5_Method2(string strSource)        {            string strResult = "";            //Create             System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create();            //注意编码UTF8、UTF7、Unicode等的选择             byte[] bytResult = md5.ComputeHash(System.Text.Encoding.UTF8.GetBytes(strSource));            //字节类型的数组转换为字符串             for (int i = 0; i < bytResult.Length; i++)            {                //16进制转换                 strResult = strResult + bytResult[i].ToString("X");            }            return strResult;        } -------------------------简写--------------public string Get_MD5_Method3(string strSource) { 　return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(strSource, "MD5"); }