使用 Task.ContinueWith 创建执行队列? [英] Creating a execution queue by using Task.ContinueWith?

问题描述

我想在后台执行多个操作，但它们必须一个接一个同步执行.

I have several actions that I want to execute in the background, but they have to be executed synchronously one after the other.

我想知道使用 Task.ContinueWith 方法来实现这一点是否是个好主意.你预见到这有什么问题吗?

I was wondering if it's a good idea to use the Task.ContinueWith method to achieve this. Do you foresee any problems with this?

我的代码如下所示:

private object syncRoot =new object();
private Task latestTask;

public void EnqueueAction(System.Action action)
{
    lock (syncRoot)
    {
        if (latestTask == null)
            latestTask = Task.Factory.StartNew(action);
        else
            latestTask = latestTask.ContinueWith(tsk => action());
    }
}

推荐答案

这应该按设计工作(使用事实，如果相应的任务已经完成，TPL 将立即安排继续).

This should work as designed (using the fact that TPL will schedule the continuation immediately if the corresponding task already has completed).

就个人而言，在这种情况下，我只会使用使用并发队列的专用线程 (ConcurrentQueue) 从中提取任务 - 这更明确但更容易解析阅读代码，特别是如果您想找出当前排队的任务数量等.

Personally in this case I would just use a dedicated thread using a concurrent queue (ConcurrentQueue) to draw tasks from - this is more explicit but easier to parse reading the code, especially if you want to find out i.e. how many tasks are currently queued etc.

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