C# Web开发 标准读写Cookies的方法 支持跨二级域和虚拟目录

加密Cookies和解密Cookies方法：


加密/解密方法 DESEncrypt
    public class DESEncrypt
     {
        #region ========加密========

        /// <summary>
        /// 加密
        /// </summary>
        /// <param name="Text"></param>
        /// <returns></returns>
        public static string Encrypt(string Text)
         {
            return Encrypt(Text, "lixyvip");
         }
        /// <summary> 
        /// 加密数据 
        /// </summary> 
        /// <param name="Text"></param> 
        /// <param name="sKey"></param> 
        /// <returns></returns> 
        public static string Encrypt(string Text, string sKey)
         {
             DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray;
             inputByteArray = Encoding.Default.GetBytes(Text);
             des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
             des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
             System.IO.MemoryStream ms = new System.IO.MemoryStream();
             CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
             cs.Write(inputByteArray, 0, inputByteArray.Length);
             cs.FlushFinalBlock();
             StringBuilder ret = new StringBuilder();
            foreach (byte b in ms.ToArray())
             {
                 ret.AppendFormat("{0:X2}", b);
             }
            return ret.ToString();
         }

        #endregion

        #region ========解密========


        /// <summary>
        /// 解密
        /// </summary>
        /// <param name="Text"></param>
        /// <returns></returns>
        public static string Decrypt(string Text)
         {
            return Decrypt(Text, "lixyvip");
         }
        /// <summary> 
        /// 解密数据 
        /// </summary> 
        /// <param name="Text"></param> 
        /// <param name="sKey"></param> 
        /// <returns></returns> 
        public static string Decrypt(string Text, string sKey)
         {
            try
             {
                 DESCryptoServiceProvider des = new DESCryptoServiceProvider();
                int len;
                 len = Text.Length / 2;
                byte[] inputByteArray = new byte[len];
                int x, i;
                for (x = 0; x < len; x++)
                 {
                     i = Convert.ToInt32(Text.Substring(x * 2, 2), 16);
                     inputByteArray[x] = (byte)i;
                 }
                 des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
                 des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
                 System.IO.MemoryStream ms = new System.IO.MemoryStream();
                 CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
                 cs.Write(inputByteArray, 0, inputByteArray.Length);
                 cs.FlushFinalBlock();
                return Encoding.Default.GetString(ms.ToArray());
             }
            catch 
             {
                return Text;
             }
         }

        #endregion
     }


读取当前客户机器所有的Cookies代码：


            string[] keyArr = HttpContext.Current.Request.Cookies.AllKeys;
            for (int c = 0; c < keyArr.Length; c++)
             {
                 Response.Write(HttpContext.Current.Request.Cookies[keyArr[c]].Name);
                 Response.Write("<br />");
                 Response.Write(HttpContext.Current.Request.Cookies[keyArr[c]].Expires.ToString());
                 Response.Write("<br />");
                 Response.Write(HttpContext.Current.Request.Cookies[keyArr[c]].Value);
                 Response.Write("<br />");
                 Response.Write("<br />");
             }



使用或自己写重载方法参考示例：Cookie有三个属性需要注意一下：
1. Domain 域
2. Path       路径
3. Expires 过期时间

跨域操作需要设置域属性:
Response.Cookies("MyCookie").Domain = "cnblogs.com"; (这里指的是泛域名)
这样在其它二级域名下就都可以访问到了， ASP 和 ASP.NET 测试通过

虚拟目录下访问：
我在ASP端做了下测试，.NET的没试, 如果不指定Path属性， 不同虚拟目录下Cookie无法共享
将Response.Cookies("MyCookie").Path = "/" 就可以了

总的写法:
Response.Cookies("MyCookie").Domain = "cnblogs.com";
Response.Cookies("MyCookie").Path = "/"
Response.Cookies("MyCookie").Expires = Now + 365;
Response.Cookies("MyCookie")("Test") = "test";

SetUserCookies(SiteInfo.DomainName, "/", "hnce", name, str, DateTime.Now.AddMinutes(miniute));

return GetUserCookies("hnce", name);

ClearUserCookies(SiteInfo.DomainName, "/", "hnce");


另外提醒一下，cookie.Values.Add(_cookiename, _value); 跟 cookie.Values[_cookiename] = _value; 这两种方式都可以设置Cookies的值，但是Add和Set方法后，读取要使用Get方法，而Values[]赋值方式，读取要使用HttpContext.Current.Request.Cookies[_key][_cookiename].ToString() 

否则有Cookies读取不了的情况。


//下面附参考文章的部分内容说明

//------------------------------------------------------------------------


在博客园看到另外一个朋友的可跨二级域操作Cookies方法，在它基础上完善了一下，现发出来

我参考的哪位朋友的文章地址是：http://www.cnblogs.com/voswin/articles/1281520.html 

如果无法使用：

请导入命名空间

using System.Security.Cryptography;
using System.Text