TPL 队列处理

本文介绍了TPL 队列处理的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我目前正在做一个项目，我需要排队处理一些工作，这是要求:

I'm currently working on a a project and I have a need to queue some jobs for processing, here's the requirement:

必须一次处理一个作业

必须能够等待排队的项目

所以我想要类似的东西:

So I want something akin to:

Task<result> QueueJob(params here) { /// Queue the job and somehow return a waitable task that will wait until the queued job has been executed and return the result. }

我尝试过一个后台运行任务，它只是将项目从队列中拉出并处理作业，但困难在于从后台任务到方法.

I've tried having a background running task that just pulls items off a queue and processes the job, but the difficulty is getting from a background task to the method.

如果需要，我可以只在 QueueJob 方法中请求完成回调，但如果我能得到一个透明的任务返回，让您等待作业被处理(即使队列中还有工作).

If need be I could go the route of just requesting a completion callback in the QueueJob method, but it'd be great if I could get a transparent Task back that allows you to wait on the job to be processed (even if there are jobs before it in the queue).

推荐答案

Func<T> 不带参数，返回一个T类型的值.作业一个一个运行，你可以等待在返回的任务上获取结果.

Func<T> takes no parameters and returns a value of type T. The jobs are run one by one and you can wait on the returned task to get the result.

public class TaskQueue { private Queue<Task> InnerTaskQueue; private bool IsJobRunning; public void Start() { Task.Factory.StartNew(() => { while (true) { if (InnerTaskQueue.Count > 0 && !IsJobRunning) { var task = InnerTaskQueue.Dequeue() task.Start(); IsJobRunning = true; task.ContinueWith(t => IsJobRunning = false); } else { Thread.Sleep(1000); } } } } public Task<T> QueueJob(Func<T> job) { var task = new Task<T>(() => job()); InnerTaskQueue.Enqueue(task); return task; } }