C# WebRequest WebResponse的使用

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;


namespace WebExam
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            WebRequest request = WebRequest.Create("http://www.163.com");


            //request.BeginGetResponse(new AsyncCallback(OnResponse), request);异步页面请求


            NetworkCredential cred = new NetworkCredential("admin", "admin");
            //request.Credentials = cred;//验证


            //WebProxy wp = new WebProxy("192.168.1.100", true);//代理
            //wp.Credentials = cred;


            HttpWebRequest httpRequest = (HttpWebRequest)request;
            listBox1.Items.Add("Request time out(ms):" + request.Timeout);
            listBox1.Items.Add("Request keep alive:" + httpRequest.KeepAlive);
            listBox1.Items.Add("Request AllowAutoRedirect:" + httpRequest.AllowAutoRedirect);


            WebResponse response = request.GetResponse();
            WebHeaderCollection headers = response.Headers;
            for (int i = 0; i < headers.Count; i++)
            {
                listBox1.Items.Add(string.Format("{0}:{1}",headers.GetKey(i),headers[i]));
            }
        }


        //异步页面请求
        //private void OnResponse(IAsyncResult ar)
        //{
        //    WebRequest request = (WebRequest)ar.AsyncState;
        //    WebResponse response = request.EndGetResponse(ar);
        //    //read response
        //}
    }
}