线程
今天师傅教了一个线程入门知识点,以备后面使用:
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1 class Program 2 { 3 static void Main(string[] args) 4 { 5 Stopwatch watch = Stopwatch.StartNew(); 6 7 ////业务1 拿到起返回值 8 //var t1 = T1(); 9 //Console.WriteLine("hhh"); 10 ////业务2 拿到返回值 11 //var t2 = T2(); 12 //Console.WriteLine("hhh2"); 13 //string t = t1 + t2; 14 15 var task1 = Task.Run(() => 16 { 17 return T1(); 18 }); 19 Console.WriteLine("hhh"); 20 21 var task2 = Task.Run(() => 22 { 23 return T2(); 24 }); 25 Console.WriteLine("hhh2"); 26 27 Task.WhenAll(task1, task2); 28 29 string t = task1.Result + task2.Result; 30 31 32 //要把业务1的返回值和业务2的返回值拼接起来,输出 33 34 35 watch.Stop(); 36 var time = watch.ElapsedMilliseconds; 37 38 Console.WriteLine(t); 39 Console.WriteLine("耗时:{0}", watch.ElapsedMilliseconds); 40 41 Console.ReadKey(); 42 43 } 44 45 public static string T1() 46 { 47 Thread.Sleep(3000); 48 49 return "Msg1"; 50 } 51 52 public static string T2() 53 { 54 Thread.Sleep(5000); 55 56 return "Msg2"; 57 } 58 } 59
输入结果:
task1和task2都为子线程。而直接输出hhh和hhh2,分别占用的是task1和task2子线程的时间。主线程走到task1和task2只是执行了开启(秒开)。
执行到 Task.WhenAll(task1, task2);的时候,才输出共消耗的时间(等待所有任务结束使用)
格式化显示时间:
1 { //格式化显示时间 2 TimeSpan ts = watch.Elapsed; 3 // Format and display the TimeSpan value. 4 string elapsedTime = String.Format("{0:00}:{1:00}:{2:00}.{3:00}", 5 ts.Hours, ts.Minutes, ts.Seconds, 6 ts.Milliseconds / 10); 7 Console.WriteLine("RunTime " + elapsedTime); 8 }
task1 和 task2 两个任务在定义之后就已经马不停蹄的在子线程中运行了,Task.WaitAll 是一个等待的过程,参数就是Task参数,一旦全部执行完毕了,就继续往下执行,这里是阻塞的,还是比较好理解的。
这样的话WaitAny就很好理解了,就是参数里面的Task 有任意一个执行完成,就继续执行后面的逻辑
WhenAll
WhenAll其实跟WaitAll是为了实现一样的功能,只是在WaitAll基础上又做了一层包装,
Task.WhenAll(task1, task2).ContinueWith(p =>
{
}, TaskContinuationOptions.OnlyOnRanToCompletion);
1.WaitAny(执行的线程等待其中任何一个线程执行完毕即可执行)
2.WaitAll(执行的线程等待其中所有线程执行完毕方可执行)
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1 var t1=Task.Run(() => 2 { 3 Console.WriteLine("demo1,当前线程id为:" + Thread.CurrentThread.ManagedThreadId + ",当前时间为" + watch.ElapsedMilliseconds); 4 }); 5 var t2 = Task.Run(() => 6 { 7 Console.WriteLine("demo2,当前线程id为:" + Thread.CurrentThread.ManagedThreadId + ",当前时间为" + watch.ElapsedMilliseconds); 8 }); 9 var t3 = Task.Run(() => 10 { 11 Console.WriteLine("demo3,当前线程id为:" + Thread.CurrentThread.ManagedThreadId + ",当前时间为" + watch.ElapsedMilliseconds); 12 }); 13 var t4 = Task.Run(() => 14 { 15 Console.WriteLine("demo4,当前线程id为:" + Thread.CurrentThread.ManagedThreadId + ",当前时间为" + watch.ElapsedMilliseconds); 16 }); 17 var t5 = Task.Run(() => 18 { 19 Console.WriteLine("demo5,当前线程id为:" + Thread.CurrentThread.ManagedThreadId + ",当前时间为" + watch.ElapsedMilliseconds); 20 }); 21 var t6= Task.Run(() => 22 { 23 Console.WriteLine("demo6,当前线程id为:" + Thread.CurrentThread.ManagedThreadId + ",当前时间为" + watch.ElapsedMilliseconds); 24 }); 25 Task.WaitAll(t1,t2,t3,t4,t5,t6); 26 Console.WriteLine("执行完毕,WaitAll,线程id为:" + Thread.CurrentThread.ManagedThreadId + "耗时为:" + watch.ElapsedMilliseconds); 27 Console.ReadKey();
作者:chenze 出处:https://www.cnblogs.com/chenze-Index/ 本文版权归作者和博客园共有,欢迎转载,但未经作者同意必须保留此段声明,且在文章页面明显位置给出原文连接,否则保留追究法律责任的权利。 如果文中有什么错误,欢迎指出。以免更多的人被误导。 |