UI 线程上的任务延续 [英] Task continuation on UI thread

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.

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