线程池提供了一个后台线程的池，独自管理线程，按需增加或减少线程池中的线程数。线程池中的线程用于执行一些动作后仍然返回线程池中。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
namespace TaskSamples
{
class Program
{
static void Main()
{
TasksUsingThreadPool();
Console.ReadLine();
}
static void TasksUsingThreadPool()
{
var tf = new TaskFactory();
Task t1 = tf.StartNew(TaskMethod, "using a task factory");
Task t2 = Task.Factory.StartNew(TaskMethod, "factory via a task");
var t3 = new Task(TaskMethod, "using a task constructor and Start");
t3.Start();
Task t4 = Task.Run(() => TaskMethod("using the Run method"));
}
static object taskMethodLock = new object();
static void TaskMethod(object title)
{
lock (taskMethodLock)
{
Console.WriteLine(title);
Console.WriteLine("Task id: {0}, thread: {1}",
Task.CurrentId == null ? "no task" : Task.CurrentId.ToString(),
Thread.CurrentThread.ManagedThreadId);
Console.WriteLine("is pooled thread: {0}", Thread.CurrentThread.IsThreadPoolThread);
Console.WriteLine("is background thread: {0}", Thread.CurrentThread.IsBackground);
Console.WriteLine();
}
}
}
}
实例化TaskFactory类，将要执行的方法作为参数传递给实例的StartNew方法
var tf = new TaskFactory(); Task t1 = tf.StartNew(TaskMethod, "using a task factory");
使用Task类的静态属性TaskFactory访问TaskFactory,并调用其StartNew方法
Task t2 = Task.Factory.StartNew(TaskMethod, "factory via a task");
使用Task类的构造函数实例化Task对象，并调用其Start方法
var t3 = new Task(TaskMethod, "using a task constructor and Start"); t3.Start();
调用Task类的静态方法Run,参数为一个Action委托
Task t4 = Task.Run(() => TaskMethod("using the Run method"));
