我该如何继续在UI线程任务？ [英] How do I continue a Task on the UI thread?

问题描述

有没有标准的方式来指定的任务应该继续运行从最初的任务是创建的线程上？

目前我有以下的code - 这是工作，但跟踪调度和创建第二个动作似乎是不必要的开销

 调度= Dispatcher.CurrentDispatcher;
任务task = Task.Factory.StartNew（（）=＆GT;
{
    DoLongRunningWork（）;
}）;

任务UITask = task.ContinueWith（（）=＆GT;
{
    dispatcher.Invoke（新动作（（）=＆GT;
    {
        this.TextBlock1.Text =完成;
    }
}）;
 

解决方案

通话的延续与 TaskScheduler.FromCurrentSynchronizationContext（）：

 任务UITask = task.ContinueWith（（）=＆GT;
    {
     this.TextBlock1.Text =完成;
    }，TaskScheduler.FromCurrentSynchronizationContext（））;
 

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

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"; 
    }
});

解决方案

Call the continuation with TaskScheduler.FromCurrentSynchronizationContext():

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

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