简单md5加密

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Security.Cryptography;
 using System.Text;
 using System.Threading.Tasks;

 namespace ConsoleApplication1
 {
     class Program
     {
         static void Main(string[] args)
         {
             string s = getMD5("");
             Console.WriteLine("{0}",s);
             Console.ReadKey();
         }
         public static string getMD5(string str)
         {
             MD5 md = MD5.Create();
            //将字符转换成字节数组
             byte[] buffer=Encoding.Default.GetBytes(str);
             //返回加密好的字节数组
             byte[] mdbuffer=md.ComputeHash(buffer);
             //转换字节数组为字符串
             //1、将字节数组的每个元素按照指定编码格式解析成字符串
             //Encoding.GetEncoding("utf-8").GetString(mdbuffer);
             //2.将每个元素都Tostring
             string Tostr = "";
             for (int i = ; i < mdbuffer.Length; i++)
             {
                 //将十进制转换成16进制
                 Tostr += mdbuffer[i].ToString("x");
             }
             return Tostr;
         }     

     }
 }