webbrowser 设置cookie 以及清除cookie 例子，附源码

【核心代码】

先附上删除cookie例子

// 清除所有COOKIE
using System;
using System.IO; 

void clearIECache()
{
　　ClearFolder (new DirectoryInfo (Environment.GetFolderPath(Environment.SpecialFolder.InternetCache)));
}
 
void ClearFolder (DirectoryInfo folder)
{
　　foreach (FileInfo file in folder.GetFiles())
　　{
　　　　file.Delete(); 
　　}

　　foreach (DirectoryInfo subfolder in folder.GetDirectories())
　　{
　　　　ClearFolder(subfolder); 
　　}
}

下面是设置cookie方法                 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Text.RegularExpressions;
using Common;
using mshtml;

namespace spider
{
    public partial class WininetTest : Form
    {

        /// <summary>
        /// 获取cookie        

        /// </summary>
        [DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)]
        public static extern bool InternetGetCookie(string url, string name, StringBuilder data, ref int dataSize);
        /// <summary>   
        /// 设置cookie   
        /// </summary>   
        [DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)]
        public static extern bool InternetSetCookie(string lpszUrlName, string lbszCookieName, string lpszCookieData);


        public WininetTest()
        {
            InitializeComponent();
        }

        private void WininetTest_Load(object sender, EventArgs e)
        {
           //string url = "http://wenwen.soso.com/";
           string url = "http://zhidao.baidu.com/";
          // string url = "http://weibo.com/";

      
            this.webBrowser.Navigate(url);


        }

        private void btnGetCookie_Click(object sender, EventArgs e)
        {
            this.txtCookie.Text = GetCookie();

        }

        private void btnSetCookie_Click(object sender, EventArgs e)
        {
            ////删除旧的
            foreach (string fileName in System.IO.Directory.GetFiles(System.Environment.GetFolderPath(Environment.SpecialFolder.Cookies)))
            {

               if (fileName.ToLower().IndexOf("zhidao") > 0)
                {

                    System.IO.File.Delete("zhidao");

               }

              //  if (fileName.ToLower().IndexOf("soso") > 0)
               // {

                //    System.IO.File.Delete("soso");

              //  }

            }

            //生成新的  

            foreach (string c in GetCookie().Split(';'))
            {

                string[] item = c.Split('=');
                if (item.Length == 2)
                {
                    string name = item[0];
                    string value = item[1]   ";expires=Sun,22-Feb-2099 00:00:00 GMT";
                    InternetSetCookie(webBrowser.Url.ToString(), name, value);
                    this.txtNewCookie.Text  = name   "="   value   ";";
                }
                
            }
            
        }

        public string GetCookie()
        {
            //获取旧的  

            StringBuilder cookie = new StringBuilder(new String(' ', 2048));
           
            int datasize = cookie.Length;

            bool b = InternetGetCookie(webBrowser.Url.ToString(), null, cookie, ref datasize);
            if (b)
            {
                return webBrowser.Document.Cookie;
            }
            return null;
        }

        private void btnSave_Click(object sender, EventArgs e)
        {
            string cookie = this.txtNewCookie.Text;
        }

      }
}