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嵌套任務(wù)和子任務(wù)

 昵稱10504424 2013-06-14
public class Program
    {
       
static void Main(string[] args)
        {
            WaitForSimpleNestedTask();
            Console.WriteLine(
"=====================================================");
            SimpleNestedTask();
            Thread.SpinWait(
600000);//等待SimpleNestedTask結(jié)束 再運(yùn)行
            Console.WriteLine("=====================================================");
           
//SimpleNestedTaskAttachedToParent();
            Console.Read();
        }
       
static void WaitForSimpleNestedTask()
        {
           
var outer = Task<int>.Factory.StartNew(() =>
            {
                Console.WriteLine(
"Outer1 task executing.");

               
var nested = Task<int>.Factory.StartNew(() =>
                {
                    Console.WriteLine(
"Nested1 task starting.");
                    Thread.SpinWait(
5000000);
                    Console.WriteLine(
"Nested1 task completing.");
                   
return 42;
                });

               
// 父任務(wù)等待子任務(wù)完成
                return nested.Result;
               
// 父任務(wù)不等待子任務(wù)完成
               
//return 1;
            });
           
//輸出的時(shí)候使用了返回值outer.Result,所以自動(dòng)等待父任務(wù)完成
            Console.WriteLine("Outer1 has returned {0}.", outer.Result);
        }
       
static void SimpleNestedTask()
        {
           
var parent = Task.Factory.StartNew(() =>
            {
                Console.WriteLine(
"Outer2 task executing.");

               
var child = Task.Factory.StartNew(() =>
                {
                    Console.WriteLine(
"Nested2 task starting.");
                    Thread.SpinWait(
500000);
                    Console.WriteLine(
"Nested2 task completing.");
                });
            });
           
//等待父任務(wù)完成,再輸出字符串,如果沒有這個(gè)等待,這句話會(huì)先輸出
            parent.Wait();
            Console.WriteLine(
"Outer2 has completed.");
        }

       
static void SimpleNestedTaskAttachedToParent()
        {
           
var parent = Task.Factory.StartNew(() =>
            {
                Console.WriteLine(
"Outer3 task executing.");

               
var child = Task.Factory.StartNew(() =>
                {
                    Console.WriteLine(
"Nested3 task starting.");
                    Thread.SpinWait(
500000);
                    Console.WriteLine(
"Nested3 task completing.");
                }, TaskCreationOptions.AttachedToParent);
               
//增加參數(shù)TaskCreationOptions.AttachedToParent,將子任務(wù)附加進(jìn)父任務(wù),這樣子任務(wù)完成后,父任務(wù)才算完成。
            });
           
           
//等待父任務(wù)完成,再輸出字符串,如果沒有這個(gè)等待,這句話會(huì)先輸出
            parent.Wait();
            Console.WriteLine(
"Outer has completed.");
        }

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