代码：

using System;using System.Collections.Generic;using System.Linq;using System.Security.Cryptography;using System.Text;using System.Threading.Tasks;namespace MessageReminder.Utils{    /// 
    /// MD5加密    /// 
    public class MD5Helper    {        /// 
        /// MD5加密        /// 
        /// 原文        public static string Encrypt(string text)        {            MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();            byte[] bArr = md5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(text));            StringBuilder sb = new StringBuilder();            foreach (byte b in bArr)            {                sb.Append(b.ToString("x2"));            }            return sb.ToString();        }    }}