Task.WaitAll不会等待子任务？ [英] Task.WaitAll doesn't wait for child task?

问题描述

您好我有 _noOfThreads 定义任务同时运行。所以我一直用％运营商，在循环我有 Tasks.WaitAll 的一端延续的任务。这是code段。

Hello I have _noOfThreads as defined tasks to run at a time. So I keep continuing the Tasks by using % operator and at the end of the loop I have Tasks.WaitAll. This is the code snippet.

for (int index = 0; index < count; index++)
{

                if (index < _noOfThreads)
                    tasks[index] = Task.Factory.StartNew(somedelegate);
                else
                    tasks[index % _noOfThreads].ContinueWith(task => { foo.bar(); }, 
                            TaskContinuationOptions.AttachedToParent);
 }
  Task.WaitAll(tasks);

不过，我注意到它没有等待子任务的完成。只要父任务完成后， Task.WaitAll 的下一行被执行。我要如何改变这种code，以等待子任务还？

However, I notice it doesn't wait for child tasks to complete. As soon as the parent tasks complete, the next line after Task.WaitAll gets executed. How do I change this code to wait for child tasks also?

推荐答案

我觉得你分配你的任务：

I think you are allocating your Tasks as:

Tasks[] tasks = new Task[ _noOfThreads];

更改code是：

Change your code to be:

Tasks[] tasks = new Task[count];

for (int index = 0; index < count; index++)
{

    if (index < _noOfThreads)
         tasks[index] = Task.Factory.StartNew(somedelegate);
    else
         tasks[index] = tasks[index % _noOfThreads].ContinueWith(task => { foo.bar(); }, 
                            TaskContinuationOptions.AttachedToParent);
}
Task.WaitAll(tasks);

试试看吧！好运：）

Give it a try! Good Luck :)

这篇关于Task.WaitAll不会等待子任务？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！