blocks|key|4775453|text|这有点奇怪，因为它不会出现在intellisense中，但你可以使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4775454|var+dispatcher+=+myDispatcherObject.Dispatcher;
if+(dispatcher.CheckAccess())+{+/*+...+*/+}|code-block|syntax|javascript|4775455|因为所有UI组件都继承自DispatcherObject，所以这应该可以解决您的特定问题，但它不是特定于UI线程的-它可以用于任何dispatcher。|offset|length|style|CODE|4775456|entityMap^0|0|0|C|G|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

This is slightly odd as it doesn't appear in intellisense, but you can use:

<pre><code>var dispatcher = myDispatcherObject.Dispatcher;
if (dispatcher.CheckAccess()) { /* ... */ }
</code></pre>

As all UI components inherit from <code>DispatcherObject</code> this should solve your specific problem, but it is not specific to the UI thread - it can be used for any dispatcher.

blocks|key|4775461|text|等同的是Dispatcher.CheckAccess。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4775462|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.windows.threading.dispatcher.checkaccess.aspx^0|4|M|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

The equivalent is <a href="http://msdn.microsoft.com/en-us/library/system.windows.threading.dispatcher.checkaccess.aspx" rel="nofollow">Dispatcher.CheckAccess</a>.

blocks|key|2877808|text|我想到的一种可能的解决方案是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2877809|if+(+Dispatcher.Thread.Equals(+Thread.CurrentThread+)+)
{
++++Action(+);
}
else
{
++++Dispatcher.Invoke(+Action+);
}|code-block|syntax|javascript|2877810|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

A possible solution that came to mind is:

<pre><code>if ( Dispatcher.Thread.Equals( Thread.CurrentThread ) )
{
 Action( );
}
else
{
 Dispatcher.Invoke( Action );
}
</code></pre>

blocks|key|668600|text|如果您正在构建Windows应用商店应用程序，则上面的示例将不起作用。这里有一个确实有效的例子。当然，可以根据需要进行修改:)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|668601|///+<summary>
///+Updates+the+UI+after+the+albums+have+been+retrieved.+This+prevents+the+annoying+delay+when+receiving+the+albums+list.
///+</summary>
///+<param+name="albums"></param>
public+void+UpdateUiAfterAlbumsRetrieved(System.Collections.ObjectModel.ObservableCollection<PhotoAlbum>+albums)
{
++++if+(!Dispatcher.HasThreadAccess)
++++{
++++++++Dispatcher.RunAsync(CoreDispatcherPriority.Normal,+()+=>
++++++++{
++++++++++++ddlAlbums.DataContext+=+albums;
++++++++++++ddlAlbums.IsEnabled+=+true;
++++++++++++tbxProgress.Text+=+String.Empty;
++++++++++++ProgressBar.IsIndeterminate+=+false;
++++++++++++ProgressBar.Visibility+=+Windows.UI.Xaml.Visibility.Collapsed;
++++++++});
++++}
++++else
++++{
++++++++ddlAlbums.DataContext+=+albums;
++++++++ddlAlbums.IsEnabled+=+true;
++++++++tbxProgress.Text+=+String.Empty;
++++++++ProgressBar.IsIndeterminate+=+false;
++++}
}|code-block|syntax|javascript|668602|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you're building a Windows Store app, the above example won't work. Here's an example that does work. Modify as needed, of course :)

<pre><code>/// &lt;summary&gt;
/// Updates the UI after the albums have been retrieved. This prevents the annoying delay when receiving the albums list.
/// &lt;/summary&gt;
/// &lt;param name="albums"&gt;&lt;/param&gt;
public void UpdateUiAfterAlbumsRetrieved(System.Collections.ObjectModel.ObservableCollection&lt;PhotoAlbum&gt; albums)
{
 if (!Dispatcher.HasThreadAccess)
 {
 Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =&gt;
 {
 ddlAlbums.DataContext = albums;
 ddlAlbums.IsEnabled = true;
 tbxProgress.Text = String.Empty;
 ProgressBar.IsIndeterminate = false;
 ProgressBar.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
 });
 }
 else
 {
 ddlAlbums.DataContext = albums;
 ddlAlbums.IsEnabled = true;
 tbxProgress.Text = String.Empty;
 ProgressBar.IsIndeterminate = false;
 }
}
</code></pre>

Is there an equivalent to Form.InvokeRequired in WPF, e.g. Dispatcher.InvokeRequired?

Equivalent to InvokeRequired in WPF

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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在WPF中有没有等同于Form.InvokeRequired的东西，比如Dispatcher.InvokeRequired？

问等效于WPF中的InvokeRequired
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