C#操作Cookie的代碼

namespace Net.String.ConsoleApplication
{
    using System;
    using System.Web;


public static class CookieHelper
{
    /// <summary>
    /// 添加cookie
    /// </summary>
    public static void AddCookie(this HttpContext h,string name, string value)
    {
        HttpCookie cookieName = new HttpCookie(name, System.Web.HttpUtility.UrlEncode(value, System.Text.Encoding.GetEncoding(65001)));
        h.Response.Cookies.Add(cookieName);
    }

    /// <summary>
    /// 添加cookie
    /// </summary>
    public static void AddCookie(this HttpContext h,string name, string value, TimeSpan span)
    {
        HttpCookie cookieName = new HttpCookie(name, System.Web.HttpUtility.UrlEncode(value, System.Text.Encoding.GetEncoding(65001)));

        cookieName.Expires = DateTime.Now.Add(span);

        h.Response.Cookies.Add(cookieName);
    }

    /// <summary>
    /// 得到cookie
    /// </summary>
    public static string GetCookie(this HttpContext h, string name)
    {
        if (h.Request.Cookies[name] != null)
        {
            if (h.Response.Cookies.Count > 0 && h.Response.Cookies[name] != null)
            {
                return System.Web.HttpUtility.UrlDecode(h.Response.Cookies[name].Value, System.Text.Encoding.GetEncoding(65001));
            }
            return System.Web.HttpUtility.UrlDecode(h.Request.Cookies[name].Value, System.Text.Encoding.GetEncoding(65001));
        }
        else
        { return string.Empty; }
    }

    /// <summary>
    /// 刪除cookie
    /// </summary>
    public static void RemoveCookie(this HttpContext h,string name)
    {
        h.Response.Cookies[name].Value = null;
        h.Response.Cookies[name].Expires = DateTime.Now.AddDays(-1);
    }

    /// <summary>
    /// 清空cookie
    /// </summary>
    public static void ClearCookie(this HttpContext h)
    {
        try
        {
            foreach (HttpCookie hc in h.Response.Cookies)
            {
                hc.Value = null;
                hc.Expires = DateTime.Now.AddDays(-1);
            }
        }
        catch { }
    }
}

}</pre>