MD5加密

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

namespace Infrastructure
{
public class Md5
{
public static string Encrypt(string str)
{

string pwd = String.Empty;

MD5 md5 = MD5.Create();

// 编码UTF8/Unicode　
byte[] s = md5.ComputeHash(Encoding.UTF8.GetBytes(str));

// 转换成字符串
for (int i = 0; i < s.Length; i++)
{
//格式后的字符是小写的字母
//如果使用大写（X）则格式后的字符是大写字符
pwd = pwd + s[i].ToString("X");

}

return pwd;
}
}
}