HttpWebRequest 以及WebRequest的使用

1.WebRequest的发送数据以及接收数据

class Program
    {
        static void Main(string[] args)
        {
            //创建一个实例并发送请求
            HttpWebRequest we = (HttpWebRequest)WebRequest.Create("http://hao.360.cn/?src=360c");
            we.Method = "Get";
            we.KeepAlive = true;
            //设置返回数据超时的时间30s
            we.Timeout = 30000;
            //开始异步获得发过来的数据
            we.BeginGetResponse(new AsyncCallback(Callback), we);


            Console.ReadKey();
        }

        static void Callback(IAsyncResult result)
        {
            HttpWebRequest we = (HttpWebRequest)result.AsyncState;
            //结束获得的数据
            WebResponse web = we.EndGetResponse(result);
            //读取返回来的数据
            using (Stream stream = web.GetResponseStream())
            {
                StreamReader streamReader = new StreamReader(stream);
                string ss = streamReader.ReadToEnd();
                Console.Write(ss);
            }
        }
    }

 2.HttpWebRequest的使用

 class Program
    {
        static void Main(string[] args)
        {
            //创建一个请求实例
            WebRequest web = (HttpWebRequest)HttpWebRequest.Create("http://www.baidu.com");
            web.Method = "Post";
            //开始异步发送请求数据
            web.BeginGetRequestStream(new AsyncCallback(AsyncCallback), web);
            Console.ReadKey();
        }

        //发送数据  可以考虑发送登录的密码以及账号信息等
       static  void AsyncCallback(IAsyncResult result)
        {
            HttpWebRequest web = (HttpWebRequest)result.AsyncState;
            using (Stream stream = web.EndGetRequestStream(result))
            {
                byte[] postData = Encoding.UTF8.GetBytes("你好");
                stream.Write(postData, 0, postData.Length);
            }
           //开始异步接收数据
            web.BeginGetResponse(new AsyncCallback(CallbackResponse), web);

        }

        //接收服务器返回的数据
       static  void CallbackResponse(IAsyncResult result)
        {
            HttpWebRequest web = (HttpWebRequest)result.AsyncState;
           //结束返回的请求数据
            HttpWebResponse response = (HttpWebResponse)web.EndGetResponse(result);
           //输出返回的数据
            using (Stream stream = response.GetResponseStream())
            {
                StreamReader streamReader = new StreamReader(stream);
                //Console.WriteLine(streamReader.ReadToEnd());

                File.WriteAllText(@"C:/12e.txt", streamReader.ReadToEnd(),Encoding.UTF8);
            }
        }

    }