UI 线程上的任务延续 | 线程上的任务延续

本文介绍了UI 线程上的任务延续的处理方法，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

是否有一种标准"的方式来指定任务延续应该在创建初始任务的线程上运行?

Is there a 'standard' way to specify that a task continuation should run on the thread from which the initial task was created?

目前我有下面的代码 - 它正在工作，但跟踪调度程序并创建第二个操作似乎是不必要的开销.

Currently I have the code below - it is working but keeping track of the dispatcher and creating a second Action seems like unnecessary overhead.

dispatcher = Dispatcher.CurrentDispatcher;
Task task = Task.Factory.StartNew(() =>
{
    DoLongRunningWork();
});

Task UITask= task.ContinueWith(() =>
{
    dispatcher.Invoke(new Action(() =>
    {
        this.TextBlock1.Text = "Complete";
    }
});

推荐答案

用TaskScheduler.FromCurrentSynchronizationContext()调用continuation:

Call the continuation with TaskScheduler.FromCurrentSynchronizationContext():

    Task UITask= task.ContinueWith(() =>
    {
     this.TextBlock1.Text = "Complete";
    }, TaskScheduler.FromCurrentSynchronizationContext());

这仅适用于当前执行上下文在 UI 线程上的情况.

This is suitable only if the current execution context is on the UI thread.

这篇关于UI 线程上的任务延续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！