一、加密解密方法

using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Security.Cryptography;using System.Text;using System.Web;namespace MvcApplication1.Helper{    public class CryptoSecurity    {        /// 
        /// 对地址加密        /// 
        ///         /// 
             public static string UrlEncode(string url)        {            string[] str = url.Split('?');            return str[0] + "?" + Encode(str[1]) + ".shtml";        }        /// 
        /// 对地址解密        /// 
        ///         /// 
             public static string[] UrlDecode(string url)        {            string[] urls = new string[2];            try            {                string[] str = url.Split('?');                urls[0] = str[0];                urls[1] = Decode(str[1].Split('.')[0]);                return urls;            }            catch            {                urls[0] = "/Home/Error";                urls[1] = "";                return urls;            }        }        private static string key = DateTime.Now.ToString(yyMMdd) + "1jjqsd789";        /// 
        /// 加密        /// 
        ///         /// 
             public static string Encode(string str)        {            DESCryptoServiceProvider provider = new DESCryptoServiceProvider();            provider.Key = Encoding.ASCII.GetBytes(key.Substring(0, 8));            provider.IV = Encoding.ASCII.GetBytes(key.Substring(0, 8));            byte[] bytes = Encoding.GetEncoding("GB2312").GetBytes(str);            MemoryStream stream = new MemoryStream();            CryptoStream stream2 = new CryptoStream(stream, provider.CreateEncryptor(), CryptoStreamMode.Write);            stream2.Write(bytes, 0, bytes.Length);            stream2.FlushFinalBlock();            StringBuilder builder = new StringBuilder();            foreach (byte num in stream.ToArray())            {                builder.AppendFormat("{0:X2}", num);            }            stream.Close();            return builder.ToString();        }        /// 
        /// Des 解密 GB2312         /// 
        /// Desc string        /// 
             public static string Decode(string str)        {            DESCryptoServiceProvider provider = new DESCryptoServiceProvider();            provider.Key = Encoding.ASCII.GetBytes(key.Substring(0, 8));            provider.IV = Encoding.ASCII.GetBytes(key.Substring(0, 8));            byte[] buffer = new byte[str.Length / 2];            for (int i = 0; i < (str.Length / 2); i++)            {                int num2 = Convert.ToInt32(str.Substring(i * 2, 2), 0x10);                buffer[i] = (byte)num2;            }            MemoryStream stream = new MemoryStream();            CryptoStream stream2 = new CryptoStream(stream, provider.CreateDecryptor(), CryptoStreamMode.Write);            stream2.Write(buffer, 0, buffer.Length);            stream2.FlushFinalBlock();            stream.Close();            return Encoding.GetEncoding("GB2312").GetString(stream.ToArray());        }    }} 二、global.aspx文件

public void URLRewriting()        {            string AllUrl = Request.RawUrl.ToString();            if (AllUrl.Contains(".shtml"))            {                string[] urls = CryptoSecurity.UrlDecode(AllUrl);                Context.RewritePath(urls[0], String.Empty, urls[1]);            }        }        public void Application_BeginRequest(Object sender, EventArgs e)        {            URLRewriting();        }