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

问题描述

您好，我将 _noOfThreads 作为定义的任务一次运行.所以我继续使用 % 操作符继续任务，在循环结束时我有 Tasks.WaitAll.这是代码片段.

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);

但是，我注意到它不会等待子任务完成.一旦父任务完成，Task.WaitAll 之后的下一行就会被执行.如何更改此代码以等待子任务?

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

我认为您将任务分配为:

I think you are allocating your Tasks as:

Tasks[] tasks = new Task[ _noOfThreads];

将您的代码更改为:

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！祝你好运:)

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