C#帮助类：MD5加密

     /// <summary>
     /// MD5加密
     /// </summary>
     public class Md5
     {
         /// <summary>
         /// MD5加密
         /// </summary>
         /// <param name="str">加密字符</param>
         /// <param name="code">加密位数16/32</param>
         /// <returns></returns>
         public static string md5(string str, int code)
         {
             string strEncrypt = string.Empty;
             if (code == )
             {
                 strEncrypt = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5").Substring(, );
             }

             if (code == )
             {
                 strEncrypt = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5");
             }

             return strEncrypt;
         }
     }