ThreadPool 的用法示例：
using System;
using System.Collections;
using System.Threading;
namespace ThreadExample
{
//這是用來保存信息的數據結構，將作為參數被傳遞
public class SomeState
{
public int CookIE;
public SomeState(int iCookIE)
{
Cookie = iCookIE;
}
}
public class Alpha
{
public Hashtable HashCount;
public ManualResetEvent eventX;
public static int iCount = 0;
public static int iMaxCount = 0;
public Alpha(int MaxCount)
{
HashCount = new Hashtable(MaxCount);
iMaxCount = MaxCount;
}
//線程池裡的線程將調用Beta()方法
public void Beta(Object state)
{
//輸出當前線程的hash編碼值和CookIE的值
Console.WriteLine(" {0} {1} :", Thread.CurrentThread.GetHashCode(),((SomeState)state).CookIE);
Console.WriteLine("HashCount.Count=={0}, Thread.CurrentThread.GetHashCode()=={1}", HashCount.Count, Thread.CurrentThread.GetHashCode());
lock (HashCount)
{
//如果當前的Hash表中沒有當前線程的Hash值，則添加之
if (!HashCount.ContainsKey(Thread.CurrentThread.GetHashCode()))
HashCount.Add (Thread.CurrentThread.GetHashCode(), 0);
HashCount[Thread.CurrentThread.GetHashCode()] =
((int)HashCount[Thread.CurrentThread.GetHashCode()])+1;
}
int iX = 2000;
Thread.Sleep(iX);
//Interlocked.Increment()操作是一個原子操作，具體請看下面說明
Interlocked.Increment(ref iCount);
if (iCount == iMaxCount)
{
Console.WriteLine();
Console.WriteLine("Setting eventX ");
eventX.Set();
}
}
}
public class SimplePool
{
public static int Main(string[] args)
{
Console.WriteLine("Thread Pool Sample:");
bool W2K = false;
int MaxCount = 10;//允許線程池中運行最多10個線程
//新建ManualResetEvent對象並且初始化為無信號狀態
ManualResetEvent eventX = new ManualResetEvent(false);
Console.WriteLine("Queuing {0} items to Thread Pool", MaxCount);
Alpha oAlpha = new Alpha(MaxCount);
//創建工作項
//注意初始化oAlpha對象的eventX屬性
oAlpha.eventX = eventX;
Console.WriteLine("Queue to Thread Pool 0");
try
{
//將工作項裝入線程池
//這裡要用到Windows 2000以上版本才有的API，所以可能出現NotSupportException異常
ThreadPool.QueueUserWorkItem(new WaitCallback(oAlpha.Beta), new SomeState(0));
W2K = true;
}
catch (NotSupportedException)
{
Console.WriteLine("These API's may fail when called on a non-Windows 2000 system.");
W2K = false;
}
if (W2K)//如果當前系統支持ThreadPool的方法.
{
for (int iItem=1;iItem < MaxCount;iItem++)
{
//插入隊列元素
Console.WriteLine("Queue to Thread Pool {0}", iItem);
ThreadPool.QueueUserWorkItem(new WaitCallback(oAlpha.Beta), new SomeState(iItem));
}
Console.WriteLine("Waiting for Thread Pool to drain");
//等待事件的完成，即線程調用ManualResetEvent.Set()方法
eventX.WaitOne(Timeout.Infinite,true);
//WaitOne()方法使調用它的線程等待直到eventX.Set()方法被調用
Console.WriteLine("Thread Pool has been drained (Event fired)");
Console.WriteLine();
Console.WriteLine("Load across threads");
foreach(object o in oAlpha.HashCount.Keys)
Console.WriteLine("{0} {1}", o, oAlpha.HashCount[o]);
}
Console.ReadLine();
return 0;
}
}
}
}
