Cookies操作类

using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

/// <summary>
///Cookies 的摘要说明
/// </summary>
public class Cookies
{
 public Cookies()
 {
  //
  //TODO: 在此处添加构造函数逻辑
  //
 }
    /// <summary>
    /// 判断cookie是否存在
    /// </summary>
    /// <param name="strName">cookie名称</param>
    public static bool IsExists(String strName)
    {
        return (System.Web.HttpContext.Current.Request.Cookies[strName] == null) ? false : true;
    }
    /// <summary>
    /// 判断cookie是否存在
    /// </summary>
    /// <param name="strName">cookie名称</param>
    /// <param name="strKey">键</param>
    public static bool IsExists(String strName, String strKey)
    {
        if (System.Web.HttpContext.Current.Request.Cookies[strName] == null)
            return false;
        else
            return (String.IsNullOrEmpty(System.Web.HttpContext.Current.Request.Cookies[strName][strKey])) ? false : true;
    }
    /// <summary>
    /// 写入cookie
    /// </summary>
    /// <param name="strName">cookie名称</param>
    /// <param name="strValue">值</param>
    public static void WriteCookie(String strName, String strValue)
    {
        System.Web.HttpCookie cookie = System.Web.HttpContext.Current.Request.Cookies[strName];
        if (cookie == null)
            cookie = new System.Web.HttpCookie(strName);

        cookie.Value = HttpUtility.UrlEncode(strValue);

        System.Web.HttpContext.Current.Response.AppendCookie(cookie);
    }
    /// <summary>
    /// 写入cookie
    /// </summary>
    /// <param name="strName">cookie名称</param>
    /// <param name="strKey">键</param>
    /// <param name="strValue">值</param>
    public static void WriteCookie(String strName, String strKey, String strValue)
    {
        System.Web.HttpCookie cookie = System.Web.HttpContext.Current.Request.Cookies[strName];
        if (cookie == null)
            cookie = new System.Web.HttpCookie(strName);

        cookie[strKey] = strValue;
        System.Web.HttpContext.Current.Response.AppendCookie(cookie);
    }
    /// <summary>
    /// 写入cookie
    /// </summary>
    /// <param name="strName">cookie名称</param>
    /// <param name="strKey">键</param>
    /// <param name="strValue">值</param>
    /// <param name="expires">cookie到期时间（分钟）</param>
    public static void WriteCookie(String strName, String strKey, String strValue, Int32 expires)
    {
        System.Web.HttpCookie cookie = System.Web.HttpContext.Current.Request.Cookies[strName];
        if (cookie == null)
            cookie = new System.Web.HttpCookie(strName);

        cookie[strKey] = strValue;
        cookie.Expires = DateTime.Now.AddMinutes(expires);
        System.Web.HttpContext.Current.Response.AppendCookie(cookie);
    }
    /// <summary>
    /// 写入cookie
    /// </summary>
    /// <param name="strName">cookie名称</param>
    /// <param name="strValue">值</param>
    /// <param name="expires">cookie到期时间（分钟）</param>
    public static void WriteCookie(String strName, String strValue, Int32 expires)
    {
        System.Web.HttpCookie cookie = System.Web.HttpContext.Current.Request.Cookies[strName];
        if (cookie == null)
            cookie = new System.Web.HttpCookie(strName);

        cookie.Value = strValue;
        cookie.Expires = DateTime.Now.AddMinutes(expires);
        System.Web.HttpContext.Current.Response.AppendCookie(cookie);
    }
    /// <summary>
    /// 获取cookie值
    /// </summary>
    /// <param name="strName">cookie名称</param>
    public static String GetCookie(String strName)
    {
        //return (System.Web.HttpContext.Current.Request.Cookies == null || System.Web.HttpContext.Current.Request.Cookies[strName] == null) ?
        //    String.Empty : System.Web.HttpContext.Current.Request.Cookies[strName].Value;

        return (System.Web.HttpContext.Current.Request.Cookies == null || System.Web.HttpContext.Current.Request.Cookies[strName] == null) ?
          String.Empty : HttpUtility.UrlDecode(System.Web.HttpContext.Current.Request.Cookies[strName].Value);
    }
    /// <summary>
    /// 获取cookie值
    /// </summary>
    /// <param name="strName">cookie名称</param>
    /// <param name="strKey">键</param>
    public static String GetCookie(String strName, String strKey)
    {
        return (System.Web.HttpContext.Current.Request.Cookies == null ||
            System.Web.HttpContext.Current.Request.Cookies[strName] == null ||
            String.IsNullOrEmpty(System.Web.HttpContext.Current.Request.Cookies[strName][strKey])) ?
            String.Empty : System.Web.HttpContext.Current.Request.Cookies[strName][strKey];
    }
    /// <summary>
    /// 清空cookie
    /// </summary>
    /// <param name="strName">cookie名称</param>
    public static void ClearCookie(String strName)
    {
        System.Web.HttpCookie cookie = System.Web.HttpContext.Current.Request.Cookies[strName];
        if (cookie == null)
            cookie = new System.Web.HttpCookie(strName);

        cookie.Expires = DateTime.Now.AddSeconds(-1);
        System.Web.HttpContext.Current.Response.AppendCookie(cookie);
    }

}