[C#]如何使用ThreadPool

<span style="color: #0000ff;">namespace<span style="color: #000000;"> ThreadPoolDemo
{
<span style="color: #0000ff;">class<span style="color: #000000;"> Program
{
<span style="color: #0000ff;">static <span style="color: #0000ff;">void Main(<span style="color: #0000ff;">string<span style="color: #000000;">[] args)
{
<span style="color: #0000ff;">const <span style="color: #0000ff;">int FibonacciCalculations = <span style="color: #800080;">10<span style="color: #000000;">;
ManualResetEvent[] doneEvents = <span style="color: #0000ff;">new<span style="color: #000000;"> ManualResetEvent[FibonacciCalculations];
Fibonacci[] fibArray = <span style="color: #0000ff;">new<span style="color: #000000;"> Fibonacci[FibonacciCalculations];
Random r = <span style="color: #0000ff;">new<span style="color: #000000;"> Random();
Console.WriteLine(<span style="color: #800000;">"<span style="color: #800000;">launching {0} tasks...<span style="color: #800000;">"<span style="color: #000000;">,FibonacciCalculations);
<span style="color: #0000ff;">for (<span style="color: #0000ff;">int i = <span style="color: #800080;">0; i < FibonacciCalculations; i++<span style="color: #000000;">)
{
doneEvents[i] = <span style="color: #0000ff;">new ManualResetEvent(<span style="color: #0000ff;">false<span style="color: #000000;">);
Fibonacci f = <span style="color: #0000ff;">new Fibonacci(r.Next(<span style="color: #800080;">20,<span style="color: #800080;">40<span style="color: #000000;">),doneEvents[i]);
fibArray[i] =<span style="color: #000000;"> f;
ThreadPool.QueueUserWorkItem(f.ThreadPoolCallback,i);
}
<span style="color: #008000;">//<span style="color: #008000;">wait for all threads in pool to calculate
<span style="color: #000000;"> WaitHandle.WaitAll(doneEvents);
<span style="color: #0000ff;">for (<span style="color: #0000ff;">int i = <span style="color: #800080;">0; i < FibonacciCalculations; i++<span style="color: #000000;">)
{
Fibonacci f =<span style="color: #000000;"> fibArray[i];
Console.WriteLine(<span style="color: #800000;">"<span style="color: #800000;">Fibonacci({0})={1}<span style="color: #800000;">"<span style="color: #000000;">,f.N,f.FibofN);
}
Console.Read();
}
}
<span style="color: #0000ff;">public <span style="color: #0000ff;">class<span style="color: #000000;"> Fibonacci
{
<span style="color: #0000ff;">private <span style="color: #0000ff;">int<span style="color: #000000;"> _n;
<span style="color: #0000ff;">private <span style="color: #0000ff;">int<span style="color: #000000;"> _fibofN;
<span style="color: #0000ff;">private<span style="color: #000000;"> ManualResetEvent _doneEvent;
<span style="color: #0000ff;">public <span style="color: #0000ff;">int N { <span style="color: #0000ff;">get { <span style="color: #0000ff;">return<span style="color: #000000;"> _n; } }
<span style="color: #0000ff;">public <span style="color: #0000ff;">int FibofN { <span style="color: #0000ff;">get { <span style="color: #0000ff;">return<span style="color: #000000;"> _fibofN; } }
<span style="color: #0000ff;">public Fibonacci(<span style="color: #0000ff;">int<span style="color: #000000;"> n,ManualResetEvent doneEvent)
{
_n =<span style="color: #000000;"> n;
_doneEvent =<span style="color: #000000;"> doneEvent;
}
<span style="color: #0000ff;">public <span style="color: #0000ff;">void ThreadPoolCallback(<span style="color: #0000ff;">object<span style="color: #000000;"> threadContext)
{
<span style="color: #0000ff;">int threadIndex = (<span style="color: #0000ff;">int<span style="color: #000000;">)threadContext;
Console.WriteLine(<span style="color: #800000;">"<span style="color: #800000;">thread {0} started....<span style="color: #800000;">"<span style="color: #000000;">,threadIndex);
_fibofN =<span style="color: #000000;"> Calculate(_n);
Console.WriteLine(<span style="color: #800000;">"<span style="color: #800000;">thread {0} result calculated...<span style="color: #800000;">"<span style="color: #000000;">,threadIndex);
_doneEvent.Set();
}
<span style="color: #0000ff;">public <span style="color: #0000ff;">int Calculate(<span style="color: #0000ff;">int<span style="color: #000000;"> n)
{
<span style="color: #0000ff;">if (n <= <span style="color: #800080;">1<span style="color: #000000;">)
{
<span style="color: #0000ff;">return<span style="color: #000000;"> n;
}
<span style="color: #0000ff;">return Calculate(n - <span style="color: #800080;">1) + Calculate(n - <span style="color: #800080;">2<span style="color: #000000;">);
}
}
}