关于c#:chap03使用线程池

1、
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;

namespace DataReport
{

class Class1
{static void Main(string[] args)
    {
        int threadId = 0;
        RunOnThreadPool poolDelegate = Test;

        var t = new Thread(() => Test(out threadId));
        t.Start();
        t.Join();
        Console.WriteLine("Thread id :{0}", threadId);
        IAsyncResult r = poolDelegate.BeginInvoke(out threadId, Callback, "a delegate asynchronous call");
        r.AsyncWaitHandle.WaitOne();

        string result = poolDelegate.EndInvoke(out threadId, r);
        Console.WriteLine("Thread pool worker thread id:{0}", threadId);
        Console.WriteLine(result);

        Thread.Sleep(TimeSpan.FromSeconds(2));
    }

    private delegate string RunOnThreadPool(out int threadId);

    private static void Callback(IAsyncResult ar)
    {Console.WriteLine("Starting a callback...");
        Console.WriteLine("State passed to a callback: {0}", ar.AsyncState);
        Console.WriteLine("Is thread pool thread:{0}", Thread.CurrentThread.IsThreadPoolThread);
        Console.WriteLine("Thread pool worker thread id: {0}", Thread.CurrentThread.ManagedThreadId);
    }

    private static string Test(out int threadId)
    {Console.WriteLine("Starting...");
        Console.WriteLine("Is thread pool thread:{0}", Thread.CurrentThread.IsThreadPoolThread);
        Thread.Sleep(TimeSpan.FromSeconds(2));
        threadId = Thread.CurrentThread.ManagedThreadId;
        return string.Format("Thread pool worker thread id was {0}", threadId);
    }
}

}

3、向线程池中放入异步操作
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;

namespace DataReport
{

class Class1
{static void Main(string[] args)
    {
        int threadId = 0;
        RunOnThreadPool poolDelegate = Test;

        var t = new Thread(() => Test(out threadId));
        t.Start();
        t.Join();
        Console.WriteLine("Thread id :{0}", threadId);
        IAsyncResult r = poolDelegate.BeginInvoke(out threadId, Callback, "a delegate asynchronous call");
        r.AsyncWaitHandle.WaitOne();

        string result = poolDelegate.EndInvoke(out threadId, r);
        Console.WriteLine("Thread pool worker thread id:{0}", threadId);
        Console.WriteLine(result);

        Thread.Sleep(TimeSpan.FromSeconds(2));
    }

    private delegate string RunOnThreadPool(out int threadId);

    using System;

using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;

namespace DataReport

{
    class Class1
    {static void Main(string[] args)
        {
            const int x = 1;
            const int y = 2;
            const string lambdaState = "lambda state 2";

            ThreadPool.QueueUserWorkItem(AsyncOperation);
            Thread.Sleep(TimeSpan.FromSeconds(1));
            ThreadPool.QueueUserWorkItem(AsyncOperation, "async state");
            Thread.Sleep(TimeSpan.FromSeconds(1));

            ThreadPool.QueueUserWorkItem(state =>
            {Console.WriteLine("Operation state:{0}", state);
                Console.WriteLine("Worker thread id: {0}", Thread.CurrentThread.ManagedThreadId);
                Thread.Sleep(TimeSpan.FromSeconds(2));
            }, "lambda state");

            ThreadPool.QueueUserWorkItem(_ =>
            {Console.WriteLine("Operation state:{0},{1}", x+y,lambdaState);
                Console.WriteLine("Worker thread id: {0}", Thread.CurrentThread.ManagedThreadId);
                Thread.Sleep(TimeSpan.FromSeconds(2));
            }, "lambda state");

            Thread.Sleep(TimeSpan.FromSeconds(2));
        }
        

        private static void AsyncOperation(object state)
        {Console.WriteLine("Operation state: {0}", state??"(null)");
            Console.WriteLine("Worker thread id:{0}", Thread.CurrentThread.ManagedThreadId);
            Thread.Sleep(TimeSpan.FromSeconds(2));
        }

    }
}

}

4、