.NET MD5 加密（备忘）

// CODE1  建立MD5加密主函数

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Security.Cryptography;
using System.Text;

namespace Ts.BusinessRules
{
    /// <summary>
    /// 公共方法类
    /// </summary>
    public class Utitly
    {
        /// <summary>
        /// 使用MD5加密字符串
        /// </summary>
        /// <param name="str">待加密的字符</param>
        /// <returns></returns>
        public static string GetStrUseMD5(string str)
        {
            if(str.IsNullOrEmpty())
            {
                return string.Empty;
            }
            MD5CryptoServiceProvider md5=new MD5CryptoServiceProvider();
            byte[] arr = UTF8Encoding.Default.GetBytes(str);
            byte[] bytes = md5.ComputeHash(arr);
            str = BitConverter.ToString(bytes);
            str=str.Replace("-", "");
            return str;
        }
    }
}

 

// CODE2 建立 string 类型的扩展方法

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace Ts.BusinessRules
{
    /// <summary>
    /// 扩展方法
    /// </summary>
    public static class ExtendMethod
    {
        /// <summary>
        /// 判断字符串是否为空或Null
        /// </summary>
        /// <param name="str">字符串</param>
        /// <returns></returns>
        /// <remarks>创建人员(日期):★ben★(101029 13:41)</remarks>
        public static bool IsNullOrEmpty(this string str)
        {
            return string.IsNullOrEmpty(str);
        }
        /// <summary>
        /// 得到MD5加密后的字符
        /// </summary>
        /// <param name="str">待转换字符</param>
        /// <returns></returns>
        public static string ToMD5(this string str)
        {
            return Utitly.GetStrUseMD5(str);
        }
    }
}

 

 

// CODE3  字符串加密的使用方法

namespace Ts.BusinessRules
{
    /// <summary>
    /// 公共方法类
    /// </summary>
    public class Utitly
    {

        public string Test(string str)
        {
             string md5=str.ToMD5();

             return md5;
        }

    }

}