static readonly int totalThreads = 20;

//设置最小线程和最大线程数
ThreadPool.SetMinThreads(2, 2);
ThreadPool.SetMaxThreads(20, 20);for (int i = 0; i < totalThreads; i++)
{ThreadPool.QueueUserWorkItem(o =>{Thread.Sleep(1000);int a, b;ThreadPool.GetAvailableThreads(out a, out b);Console.WriteLine(string.Format("({0}/{1}) #{2} : {3}", a, b, Thread.CurrentThread.ManagedThreadId, DateTime.Now.ToString()));});
}
Console.WriteLine("主线程完成");

//最简单的线程示例
Task.Factory.StartNew(() =>
{Console.WriteLine("我是使用Factory属性创建的线程");
});

//简单的Task实例创建线程
Action<object> action = (object obj) =>
{Console.WriteLine("Task={0}, obj={1}, Thread={2}", Task.CurrentId, obj.ToString(), Thread.CurrentThread.ManagedThreadId);
};
Task t1 = new Task(action, "参数");
t1.Start();

//简写上面实例，并创建100个线程
System.Diagnostics.Stopwatch watch = System.Diagnostics.Stopwatch.StartNew();
int m = 100;
Task[] tasks = new Task[m];
for (int i = 0; i < m; i++)
{tasks[i] = new Task((object obj) =>{Thread.Sleep(200);Console.WriteLine("Task={0}, obj={1}, Thread={2},当前时间：{3}",Task.CurrentId, obj.ToString(),Thread.CurrentThread.ManagedThreadId,System.DateTime.Now.ToString());}, "参数" + i.ToString());tasks[i].Start();
}Task.WaitAll(tasks);
Console.WriteLine("线程耗时：{0}，当前时间：{1}" ,watch.ElapsedMilliseconds,System.DateTime.Now.ToString());

/// <summary>
/// 一个参数的方法
/// </summary>
/// <param name="parameter"></param>
static void MyMethod(string parameter)
{Console.WriteLine("{0}", parameter);
}

//Task传入一个参数
Task myTask = new Task((parameter) => MyMethod(parameter.ToString()), "aaa");
myTask.Start();

/// <summary>
/// 多个参数的方法
/// </summary>
/// <param name="parameter1"></param>
/// <param name="parameter2"></param>
/// <param name="parameter3"></param>
static void MyMethod(string parameter1,int parameter2,DateTime parameter3)
{Console.WriteLine("{0} {1} {2}", parameter1,parameter2.ToString(),parameter3.ToString());
}

//Task传入多个参数
for (int i = 1; i <= 20; i++)
{              new Task(() => { MyMethod("我的线程", i, DateTime.Now); }).Start();Thread.Sleep(200);
}

System.Diagnostics.Stopwatch watch = System.Diagnostics.Stopwatch.StartNew();
Task<int> myTask = new Task<int>(() =>
{int sum = 0;for (int i = 0; i < 10000; i++)sum += i;return sum;
});
myTask.Start();
Console.WriteLine("结果: {0} 耗时：{1}", myTask.Result,watch.ElapsedMilliseconds);

//使用Factory属性创建
System.Diagnostics.Stopwatch watchSecond = System.Diagnostics.Stopwatch.StartNew();
Task<int> myTaskSecond = Task.Factory.StartNew<int>(() =>
{int sum = 0;for (int i = 0; i < 10000; i++)sum += i;return sum;
});
Console.WriteLine("结果: {0} 耗时：{1}", myTaskSecond.Result, watchSecond.ElapsedMilliseconds);