C#：使用MD5对密码进行加密！

using System;
using System.Security.Cryptography;
using System.IO;
using System.Text;

public string MD5(Stream stream)
{
const string HEX_TABLE = "0123456789ABCDEF";
MD5 md5 = new MD5CryptoServiceProvider();
//Calculate MD5 Checksum
byte[]data = md5.ComputeHash(stream);
//convert to string
StringBuilder sb=new StringBuilder();
sb.Length =data.Length *2;
for(int i=0;i<data.Length ;i++)
{
sb[i*2]=HEX_TABLE[data[i]>>4];
sb[i*2+1]=HEX_TABLE[data[i] & 0xF];
}
return sb.ToString();
}

public string MD5(string s)
{
byte[] data=ASCIIEncoding.ASCII.GetBytes(s);
MemoryStream stream=new MemoryStream(data);
//stream.Write(data,0,data.Length);
return MD5(stream);
}

如果大家有更好的方法，不妨交流一下！