C# Web开发 标准读写Cookies的方法 支持跨二级域和虚拟目录

  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

 

    /// <summary>
    /// 添加/更新 Cookies
    /// </summary>
    /// <param name="_domain"></param>
    /// <param name="_cookiepath"></param>
    /// <param name="_key"></param>
    /// <param name="_cookiename"></param>
    /// <param name="_value"></param>
    public static void SetUserCookies(string _domain, string _cookiepath, string _key, string _cookiename, string _value, DateTime _expires)
    {

        HttpCookie cookie = HttpContext.Current.Request.Cookies[_key];
        
        //防止中文乱码
        _value = System.Web.HttpUtility.UrlEncode(_value);
        //加密
        _value = DESEncrypt.Encrypt(_value);

        if (cookie == null)
        {
            cookie = new HttpCookie(_key);
            cookie.Domain = _domain;
            cookie.Path = _cookiepath;
            cookie.Expires = _expires;

            cookie.Values.Add(_cookiename, _value);                
            HttpContext.Current.Response.AppendCookie(cookie);

        }
        else
        {

            cookie.Domain = _domain;
            cookie.Path = _cookiepath;
            cookie.Expires = _expires;

            if (cookie.Values[_cookiename] != null)
            {  
                cookie.Values.Set(_cookiename, _value);
            }
            else
            {

                cookie.Values.Add(_cookiename, _value);
            }
            HttpContext.Current.Response.SetCookie(cookie);
            
        }

    }
    /// <summary>
    /// 读取Cookies
    /// </summary>
    /// <param name="_key"></param>
    /// <param name="_cookiename"></param>
    /// <returns></returns>
    public static string GetUserCookies(string _key, string _cookiename)
    {

        HttpCookie cookie = HttpContext.Current.Request.Cookies[_key];
        
        if (cookie != null)
        {

            string _value = cookie.Values.Get(_cookiename);

            if (!string.IsNullOrEmpty(_value))
            {
                //防止中文乱码
                _value = System.Web.HttpUtility.UrlDecode(_value);
                //解密
                _value = DESEncrypt.Decrypt(_value);
                return _value;
            }
            else
            {
                return "";
            }
        }
        else
        {
            return "";
        }

    }
    /// <summary>
    /// 清除Cookies
    /// </summary>
    /// <param name="_domain"></param>
    /// <param name="_cookiepath"></param>
    /// <param name="key"></param>
    public static void ClearUserCookies(string _domain, string _cookiepath, string _key)
    {
        HttpCookie cookie = HttpContext.Current.Request.Cookies[_key];
        if (cookie != null)
        {
            cookie.Values.Clear();

            cookie.Domain = _domain;
            cookie.Path = _cookiepath;
            cookie.Expires = DateTime.Now.AddDays(-1);

            HttpContext.Current.Response.SetCookie(cookie);
        }

    }

加密Cookies和解密Cookies方法：

    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：

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

//------------------------------------------------------------------------
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";