C#实现异步GET的方法

using System;
using System.Collections.Generic;
using System.Configuration;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
namespace WebClientAsynProject
{
public class Program
{
#region HttpWebRequest异步GET
public static void AsyncGetWithWebRequest(string url)
{
var request = (HttpWebRequest) WebRequest.Create(new Uri(url));
request.BeginGetResponse(new AsyncCallback(ReadCallback), request);
}
private static void ReadCallback(IAsyncResult asynchronousResult)
{
var request = (HttpWebRequest) asynchronousResult.AsyncState;
var response = (HttpWebResponse) request.EndGetResponse(asynchronousResult);
using (var streamReader = new StreamReader(response.GetResponseStream()))
{
var resultString = streamReader.ReadToEnd();
Console.WriteLine(resultString);
}
}
#endregion
#region WebClient异步GET
public static void AsyncGetWithWebClient(string url)
{
var webClient = new WebClient();
webClient.DownloadStringCompleted += new DownloadStringCompletedEventHandler(client_DownloadStringCompleted);
webClient.DownloadStringAsync(new Uri(url));
}
private static void client_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
//Console.WriteLine(e.Cancelled);
Console.WriteLine(e.Error != null ? "WebClient异步GET发生错误！" : e.Result);
}
#endregion
#region WebClient的OpenReadAsync测试
public static void TestGetWebResponseAsync(string url)
{
var webClient = new WebClient();
webClient.OpenReadCompleted += new OpenReadCompletedEventHandler(webClient_OpenReadCompleted);
webClient.OpenReadAsync(new Uri(url));
}
private static void webClient_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
if(e.Error == null)
{
var streamReader = new StreamReader(e.Result);
var result = streamReader.ReadToEnd();
Console.WriteLine(result);
}
else
{
Console.WriteLine("执行WebClient的OpenReadAsync出错：" + e.Error);
}
}
#endregion
public static void Main(string[] args)
{
AsyncGetWithWebRequest("http://baidu.com");
Console.WriteLine("hello");
AsyncGetWithWebClient("http://baidu.com");
Console.WriteLine("world");
TestGetWebResponseAsync("http://baidu.com");
Console.WriteLine("jxqlovejava");
Console.Read();
}
}
}