C#发送HTTP请求自动登录Web网站

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;

namespace WebNET
{
    class LoginWeb
    {
        static void Main(string[] args)
        {
            string loginUrl = "http://202.114.74.218/web3/login_gr.aspx";
            string loginData = "uid=******&pwd=******";
            CookieContainer cookies = new CookieContainer();
            string loginResult = LoginWeb.HttpPost(loginUrl, loginData, cookies);
            Console.WriteLine("这是登陆后的界面信息！");
            Console.WriteLine(loginResult);

            //预约明天的票
            string checkUrl =
                "http://202.114.74.218/web3/baobiao/Queue/QueueSystem.aspx";
            string checkData = "ImageButton2.x=167&ImageButton2.y=20&deptID=3&dateType=NextDday&timeType=AM";
            string checkResult = LoginWeb.HttpPost(checkUrl, checkData, cookies);
            Console.WriteLine("这是取票结果");
            Console.WriteLine(checkResult);
            Console.ReadKey();
        }

        /************************************************************************/
        /* Http Get请求
         * url为请求的网址
         * data为GET请求参数（格式为：key1=value1&key2=value2）
         */
        /************************************************************************/
        public static string HttpGet(string url, string data)
        {
            url = url + "?" + data;
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "GET";
            request.ContentType = "text/hmtl;charset=UTF-8";
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream responseStream = response.GetResponseStream();
            StreamReader streamReader = new StreamReader(responseStream);
            string result = streamReader.ReadToEnd();
            streamReader.Close();
            responseStream.Close();
            return result;
        }

        /************************************************************************/
        /* Http Post 请求
         * url为请求的网址
         * data为POST请求参数（格式为：key1=value1&key2=value2）
         * cookie为存储Cookie的容器CookieContainer
         */
        /************************************************************************/
        public static string HttpPost(string url, string data, CookieContainer cookies)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "POST";
            //FORM元素的enctype属性指定了表单数据向服务器提交时所采用的编码类型，默认的缺省值是“application/x-www-form-urlencoded”
            request.ContentType = "application/x-www-form-urlencoded";
            request.ContentLength = Encoding.UTF8.GetByteCount(data);
            request.CookieContainer = cookies;
            Stream requetStream = request.GetRequestStream();
            StreamWriter streamWriter = new StreamWriter(requetStream);
            streamWriter.Write(data);
            streamWriter.Close();

            request.CookieContainer = cookies;

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            response.Cookies = cookies.GetCookies(response.ResponseUri);
            cookies.Add(response.Cookies);
            Stream responseStream = response.GetResponseStream();
            StreamReader streamReader = new StreamReader(responseStream, Encoding.GetEncoding("GB2312"));
            string result = streamReader.ReadToEnd();
            streamReader.Close();
            responseStream.Close();
            return result;
        }
    }
}