我应该如何从Task更新UI线程？ [英] How should I update from Task the UI Thread?

问题描述

我的任务是执行一些繁重的工作。
我需要将其结果路径为 LogContent

I have a task that performing some heavy work. I need to path it's result to LogContent

Task<Tuple<SupportedComunicationFormats, List<Tuple<TimeSpan, string>>>>.Factory
    .StartNew(() => DoWork(dlg.FileName))
    .ContinueWith(obj => LogContent = obj.Result);

这是属性：

public Tuple<SupportedComunicationFormats, List<Tuple<TimeSpan, string>>> LogContent
{
    get { return _logContent; }
    private set
    {
        _logContent = value;
        if (_logContent != null)
        {
            string entry = string.Format("Recognized {0} log file",_logContent.Item1);
            _traceEntryQueue.AddEntry(Origin.Internal, entry);
        }
    }
}

问题是 _traceEntryQueue 是绑定到UI的数据，原因是我在这样的代码上会有异常。

Problem is that _traceEntryQueue is data bound to UI, and of cause I will have exception on code like this.

所以，我的问题是使其正常工作？

So, my question is how to make it work correctly?

推荐答案

您需要在UI线程上运行ContinueWith -task。可以使用UI线程的TaskScheduler和 ContinueWith的重载版本来完成-方法，即。

You need to run the ContinueWith -task on the UI thread. This can be accomplished using the TaskScheduler of the UI thread with the overloaded version of the ContinueWith -method, ie.

TaskScheduler scheduler = TaskScheduler.Current;
...ContinueWith(obj => LogContent = obj.Result), CancellationToken.None, TaskContinuationOptions.None, scheduler)

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