在多线程环境下使用HttpWebRequest或者调用Web Service

using System;
using System.Diagnostics;
using System.Threading;
using System.Net;

namespace MultiThread
{
/// <summary>
/// Class1 的摘要说明。
/// </summary>
class Class1
{
/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main(string[] args)
{
Thread thread = new Thread(new ThreadStart(MakeThread));
thread.Start();
Console.ReadLine();
}

private static int count = 30;
private static int max = 10;
private static int x = 0;
private static int y = 0;

private static void MakeThread()
{
while (x < count)
{
if (y < max)
{
HttpWebRequest req = (HttpWebRequest)WebRequest.Create ("http://www.google.com");
req.Timeout = 100000;
ThreadPool.QueueUserWorkItem(new WaitCallback(MakeWebRequest), req);
Interlocked.Increment(ref y);
}
Thread.Sleep(0);
}
Console.WriteLine("=======================================");
}

private static void MakeWebRequest (object obj)
{
HttpWebRequest req = obj as HttpWebRequest;
HttpWebResponse res = null;
try
{
Console.WriteLine ("\nConnecting to " + req.RequestUri);
res = (HttpWebResponse) req.GetResponse ();
Console.WriteLine("[" + AppDomain.GetCurrentThreadId() + "] ContentLength:" + res.ContentLength);
Console.WriteLine ("Connected.\n");
}
catch (Exception e)
{
if (res != null)
{
res.Close ();
Interlocked.Increment(ref x);
Interlocked.Decrement(ref y);
res = null;
}
Console.WriteLine ("Source : " + e.Source);
Console.WriteLine ("Message : " + e.Message);
Console.WriteLine(e.ToString());
Debug.WriteLine(e.ToString());
}
finally
{
if (res != null)
{
res.Close ();
Interlocked.Increment(ref x);
Interlocked.Decrement(ref y);
}
}
}
}
}