.net 在 WinRT 中的 UI 线程上运行代码
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/10579027/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Run code on UI thread in WinRT
提问by ofer
How can I run code on the UI thread in WinRT (Windows 8 Metro)?
如何在 WinRT (Windows 8 Metro) 的 UI 线程上运行代码？
The Invokemethod does not exist.
该Invoke方法不存在。
回答by C?ur
It's easier to directly get the CoreWindowfrom the non-UI thread. The following code will work everywhere, even when GetForCurrentThread()or Window.Currentreturns null.
从非 UI 线程直接获取CoreWindow更容易。以下代码适用于任何地方，即使在GetForCurrentThread()orWindow.Current返回null 时也是如此。
CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(CoreDispatcherPriority.Normal,
<lambda for your code which should run on the UI thread>);
for example:
例如：
CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(CoreDispatcherPriority.Normal,
() =>
{
// Your UI update code goes here!
});
You'll need to reference Windows.ApplicationModel.Corenamespace:
您需要引用Windows.ApplicationModel.Core命名空间：
using Windows.ApplicationModel.Core;
回答by ReinstateMonica Larry Osterman
Use:
用：
From your UI thread, execute:
从您的 UI 线程，执行：
var dispatcher = Windows.UI.Core.CoreWindow.GetForCurrentThread().Dispatcher;
From your background (non UI thread)
从你的背景（非 UI 线程）
dispatcher.RunAsync(DispatcherPriority.Normal,
<lambda for your code which should run on the UI thread>);
That should work on both CP and later builds.
这应该适用于 CP 和更高版本的构建。
回答by Mangesh Ozardekar
Use:
用：
this.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => Frame.Navigate(typeof(Welcome), this));
It works for me.
这个对我有用。
回答by Deeb
This is a much easier way in my opinion.
在我看来，这是一种更简单的方法。
Get the TaskScheduler associated with the UI.
获取与 UI 关联的 TaskScheduler。
var UISyncContext = TaskScheduler.FromCurrentSynchronizationContext();
Then start a new Task and on the above UISyncContext.
然后在上面的 UISyncContext 上启动一个新的 Task。
Task.Factory.StartNew(() => { /* Do your UI stuff here; */}, new System.Threading.CancellationToken(), TaskCreationOptions.PreferFairness, UISyncContext);
回答by David Rettenbacher
DispatcherTimeris also an option.
DispatcherTimer也是一个选项。
I used it for code that must be run in Xaml-designer (CoreWindow.Dispatcher,... are not available in UWP-designer)
我将它用于必须在 Xaml-designer 中运行的代码（CoreWindow.Dispatcher，...在 UWP-designer 中不可用）
var localTimer = new DispatcherTimer
{
Interval = TimeSpan.FromMilliseconds(0)
};
localTimer.Tick += (timer, e) =>
{
(timer as DispatcherTimer).Stop();
action();
};
localTimer.Start();
Disclaimer:
I should note that this should be a last-resort option if every other fails.
免责声明：
我应该注意，如果其他方法都失败了，这应该是最后的选择。
回答by George Birbilis
On UWP, I was having problem trying to set the Source property of CaptureElement control (that is defined in XAML), it was complaining about being prepared at different thread, even though I was trying to set it from code that was invoked via a Page_Loaded event handler. I ended up using this to work around it:
在 UWP 上，我在尝试设置 CaptureElement 控件的 Source 属性（在 XAML 中定义）时遇到问题，它抱怨在不同的线程上准备，即使我试图从通过 Page_Loaded 调用的代码设置它事件处理程序。我最终使用它来解决它：
previewControl.Dispatcher.TryRunAsync(CoreDispatcherPriority.Normal, () => {
previewControl.Source = _mediaCapture;
}).GetAwaiter().GetResult();
