blocks|key|504561|text|WPF支持两种不同风格的焦点：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|504562|504563|键盘焦点|ordered-list-item|504564|Logical+focus|504565|504566|FocusedElement属性获取或设置焦点范围内的逻辑焦点。我怀疑您的TextBox确实有逻辑焦点，但它包含的焦点范围不是活动焦点范围。因此，它没有键盘焦点。|offset|length|style|CODE|504567|所以问题是，你的视觉树中有多个焦点范围吗？|504568|entityMap^0|0|0|0|0|0|0|E|11|7|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|T|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|U|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|V|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|X|8|@$K|Y|L|Z|M|N]|$K|10|L|11|M|N]]|9|@]|A|$]]|$1|O|3|P|5|6|7|12|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|R|$]]

WPF supports two different flavors of focus:

<ol>
<li>Keyboard focus</li>
<li>Logical focus</li>
</ol>

The <code>FocusedElement</code> property gets or sets logical focus within a focus scope. I suspect your <code>TextBox</code> does have logical focus, but its containing focus scope is not the active focus scope. Ergo, it does not have keyboard focus.

So the question is, do you have multiple focus scopes in your visual tree?

blocks|key|3724752|text|就在最近，我有一个列表框，里面有一些TextBlocks。我希望能够双击文本块并将其转换为TextBox，然后专注于它并选择所有文本，这样用户就可以开始键入新名称(Akin+to+Adobe+Layers)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3724753|不管怎么说，我在做这件事的时候，它就是不起作用。对我来说，这里的神奇之处在于确保我将事件设置为已处理。我认为它是在设置焦点，但一旦事件沿着这条道路走下去，它就切换了逻辑焦点。|3724754|这个故事的寓意是，确保将事件标记为已处理，这可能是您的问题。|3724755|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Just recently I had a list-box that housed some TextBlocks. I wanted to be able to double click on the text block and have it turn into a TextBox, then focus on it and select all the text so the user could just start typing the new name (Akin to Adobe Layers)

Anyway, I was doing this with an event and it just wasn't working. The magic bullet for me here was making sure that I set the event to handled. I figure it was setting focus, but as soon as the event went down the path it was switching the logical focus.

The moral of the story is, make sure you're marking the event as handled, that might be your issue.

blocks|key|1113122|text|我已经注意到一个焦点问题，它特别与在ElementHosts中托管WPF+UserControls有关，它包含在一个通过MdiParent属性设置为MDI子对象的表单中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1113123|我不确定这是否是其他人正在经历的相同问题，但您可以通过下面的链接深入了解详细信息。|1113124|Issue+with+setting+focus+within+a+WPF+UserControl+hosted+within+an+ElementHost+in+a+WindowsForms+child+MDI+form|offset|length|1113125|entityMap|0|LINK|mutability|MUTABLE|url|http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/7d41218e-c2bb-4957-b0b4-aa24efc4d8c2^0|0|0|0|33|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@$F|S|G|T|1|U]]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

I've noticed a focus issue specifically related to hosting WPF UserControls within ElementHosts which are contained within a Form that is set as an MDI child via the MdiParent property.

I'm not sure if this is the same issue others are experiencing but you dig into the details by following the link below.

<a href="http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/7d41218e-c2bb-4957-b0b4-aa24efc4d8c2" rel="nofollow noreferrer">Issue with setting focus within a WPF UserControl hosted within an ElementHost in a WindowsForms child MDI form</a>

blocks|key|504754|text|我最近修复了一个登录闪屏的问题，当主窗口第一次加载时，它通过故事板显示。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|504755|我相信有两把钥匙可以解决这个问题。一种是将包含的元素设置为焦点范围。另一个是处理由正在加载的窗口触发的故事板的Storyboard+Completed事件。|504756|这个故事板使用户名和密码画布可见，然后逐渐变得100%25不透明。关键是username控件在情节提要运行之前是不可见的，因此该控件在可见之前无法获得键盘焦点。让我困惑了一段时间的是它有“焦点”(即焦点是真的，但事实证明这只是逻辑焦点)，直到阅读Kent+Boogaart的答案并查看微软的WPF+link+text，我才知道它同时具有逻辑焦点和键盘焦点的概念|offset|length|style|BOLD|504757|一旦我这样做了，我的特定问题的解决方案就很简单了：|504758|1)使包含的元素成为焦点范围|504759|<Canvas+FocusManager.IsFocusScope="True"+Visibility="Collapsed">
++++<TextBox+x:Name="m_uxUsername"+AcceptsTab="False"+AcceptsReturn="False">
++++</TextBox>
</Canvas>|code-block|syntax|javascript|504760|2)将完成的事件处理程序附加到故事板|504761|++++<Storyboard+x:Key="Splash+Screen"+Completed="UserNamePassword_Storyboard_Completed">
...
</Storyboard>|504762|和|504763|3)将我的用户名TextBox设置为在情节提要完成事件处理程序中具有键盘焦点。|504764|void+UserNamePassword_Storyboard_Completed(object+sender,+EventArgs+e)
{
+m_uxUsername.Focus();
}|504765|注意，调用item.Focus()会导致调用Keyboard.Focus(+this+)，因此您不需要显式调用它。请参阅此关于difference+between+Keyboard.Focus(item)+and+item.Focus.的问题|504766|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/aa969768.aspx|1|https://stackoverflow.com/questions/197088/whats-the-difference-between-keyboard-focusitem-and-item-focus^0|0|0|21|2|43|9|0|0|0|0|0|0|0|0|0|0|1R|1J|1|0^^$0|@$1|2|3|4|5|6|7|1E|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1F|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|1G|8|@$F|1H|G|1I|H|I]]|9|@$F|1J|G|1K|1|1L]]|A|$]]|$1|J|3|K|5|6|7|1M|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|1N|8|@]|9|@]|A|$]]|$1|N|3|O|5|P|7|1O|8|@]|9|@]|A|$Q|R]]|$1|S|3|T|5|6|7|1P|8|@]|9|@]|A|$]]|$1|U|3|V|5|P|7|1Q|8|@]|9|@]|A|$Q|R]]|$1|W|3|X|5|6|7|1R|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|1S|8|@]|9|@]|A|$]]|$1|10|3|11|5|P|7|1T|8|@]|9|@]|A|$Q|R]]|$1|12|3|13|5|6|7|1U|8|@]|9|@$F|1V|G|1W|1|1X]]|A|$]]|$1|14|3|-4|5|6|7|1Y|8|@]|9|@]|A|$]]]|15|$16|$5|17|18|19|A|$1A|1B]]|1C|$5|17|18|19|A|$1A|1D]]]]

I recently fixed this problem for a login splash screen that is being displayed via a storyboard when the main window is first loaded. 

I believe there were two keys to the fix. One was to make the containing element a focus scope. The other was to handle the Storyboard Completed event for the storyboard that was triggered by the window being loaded. 

This storyboard makes the username and password canvas visible and then fades into being 100% opaque. The key is that the username control was not visible until the storyboard ran and therefore that control could not get keyboard focus until it was visible. What threw me off for awhile was that it had "focus" (i.e. focus was true, but as it turns out this was only logical focus) and I did not know that WPF had the concept of both logical and keyboard focus until reading Kent Boogaart's answer and looking at Microsoft's WPF <a href="http://msdn.microsoft.com/en-us/library/aa969768.aspx" rel="nofollow noreferrer">link text</a>

Once I did that the solution for my particular problem was straightforward:

1) Make the containing element a focus scope

<pre><code>&lt;Canvas FocusManager.IsFocusScope="True" Visibility="Collapsed"&gt;
 &lt;TextBox x:Name="m_uxUsername" AcceptsTab="False" AcceptsReturn="False"&gt;
 &lt;/TextBox&gt;
&lt;/Canvas&gt;
</code></pre>

2) Attach a Completed Event Handler to the Storyboard

<pre><code> &lt;Storyboard x:Key="Splash Screen" Completed="UserNamePassword_Storyboard_Completed"&gt;
...
&lt;/Storyboard&gt;
</code></pre>

and

3) Set my username TextBox to have the keyboard focus in the storyboard completed event handler.

<pre><code>void UserNamePassword_Storyboard_Completed(object sender, EventArgs e)
{
 m_uxUsername.Focus();
}
</code></pre>

Note that calling item.Focus() results in the call Keyboard.Focus(this), so you don't need to call this explicitly. See this question about the <a href="https://stackoverflow.com/questions/197088/whats-the-difference-between-keyboard-focusitem-and-item-focus">difference between Keyboard.Focus(item) and item.Focus.</a>

blocks|key|1113175|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1113176|将用户控件设置为Focusable="True"+(XAML)|ordered-list-item|offset|length|style|BOLD|1113177|处理控件上的GotFocus事件，并在窗口上调用+yourTextBox.Focus()|1113178|Handle+|1113179|事件，然后调用yourControl.Focus()|1113180|在我输入的时候，我有一个样例应用程序运行在这个解决方案中。如果这对你不起作用，那么一定是你的应用程序或环境的某些特定因素导致了问题。在你最初的问题中，我认为绑定是导致问题的原因。我希望这能帮到你。|1113181|entityMap^0|0|8|G|0|6|8|P|J|0|0|7|0|7|J|0|0^^$0|@$1|2|3|-4|4|5|6|R|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|S|7|@$D|T|E|U|F|G]]|8|@]|9|$]]|$1|H|3|I|4|C|6|V|7|@$D|W|E|X|F|G]|$D|Y|E|Z|F|G]]|8|@]|9|$]]|$1|J|3|K|4|C|6|10|7|@$D|11|E|12|F|G]]|8|@]|9|$]]|$1|L|3|M|4|5|6|13|7|@$D|14|E|15|F|G]]|8|@]|9|$]]|$1|N|3|O|4|5|6|16|7|@]|8|@]|9|$]]|$1|P|3|-4|4|5|6|17|7|@]|8|@]|9|$]]]|Q|$]]

<ol>
<li>Set your user control to Focusable="True" (XAML)</li>
<li>Handle the GotFocus event on your control and call yourTextBox.Focus()</li>
<li>Handle the Loaded event on your window and call yourControl.Focus()</li>
</ol>

I have a sample app running with this solution as I type. If this does not work for you, there must be something specific to your app or environment that causes the problem. In your original question, I think the binding is causing the problem.
I hope this helps.

blocks|key|504913|text|这很愚蠢，但很管用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|504914|弹出一个等待片刻的线程，然后返回并设置您想要的焦点。它甚至可以在图元主体的上下文中工作。|504915|private+void+ListView_SelectionChanged(object+sender,+SelectionChangedEventArgs+e)
{

+System.Threading.ThreadPool.QueueUserWorkItem(
+++++++++++++++++++(a)+=>
++++++++++++++++++++++++{
++++++++++++++++++++++++++++System.Threading.Thread.Sleep(100);
++++++++++++++++++++++++++++someUiElementThatWantsFocus.Dispatcher.Invoke(
++++++++++++++++++++++++++++new+Action(()+=>
++++++++++++++++++++++++++++{
++++++++++++++++++++++++++++++++someUiElementThatWantsFocus.Focus();

++++++++++++++++++++++++++++}));
++++++++++++++++++++++++}
+++++++++++++++++++);

}|code-block|syntax|javascript|504916|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Its stupid but it works:

Pop a thread that waits a while then comes back and sets the focus you want. It even works within the context of an element host.

<pre><code>private void ListView_SelectionChanged(object sender, SelectionChangedEventArgs e)
{

 System.Threading.ThreadPool.QueueUserWorkItem(
 (a) =&gt;
 {
 System.Threading.Thread.Sleep(100);
 someUiElementThatWantsFocus.Dispatcher.Invoke(
 new Action(() =&gt;
 {
 someUiElementThatWantsFocus.Focus();

 }));
 }
 );

}
</code></pre>

blocks|key|504977|text|我在WPF+focus上找到了一系列很好的博客文章。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|504978|504979|Part+1:+It’s+Basically+Focus|unordered-list-item|offset|length|504980|Part+2:+Changing+WPF+focus+in+code|504981|Part+3:+Shifting+focus+to+the+first+available+element+in+WPF|504982|504983|它们都很好读，但第三部分专门讨论了在UserControl中设置UI元素的焦点。|504984|entityMap|0|LINK|mutability|MUTABLE|url|http://julmar.com/blog/programming/part-1-its-basically-focus/|1|http://julmar.com/blog/programming/part-2-changing-wpf-focus-in-code/|2|http://julmar.com/blog/programming/part-3-shifting-focus-to-the-first-available-element-in-wpf/^0|0|0|0|S|0|0|0|Y|1|0|0|1O|2|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|11|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|12|8|@]|9|@$F|13|G|14|1|15]]|A|$]]|$1|H|3|I|5|E|7|16|8|@]|9|@$F|17|G|18|1|19]]|A|$]]|$1|J|3|K|5|E|7|1A|8|@]|9|@$F|1B|G|1C|1|1D]]|A|$]]|$1|L|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|1F|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]|W|$5|R|S|T|A|$U|X]]|Y|$5|R|S|T|A|$U|Z]]]]

I found a good series of blog posts on WPF focus.

<ul>
<li><a href="http://julmar.com/blog/programming/part-1-its-basically-focus/" rel="nofollow noreferrer">Part 1: It’s Basically Focus</a></li>
<li><a href="http://julmar.com/blog/programming/part-2-changing-wpf-focus-in-code/" rel="nofollow noreferrer">Part 2: Changing WPF focus in code</a></li>
<li><a href="http://julmar.com/blog/programming/part-3-shifting-focus-to-the-first-available-element-in-wpf/" rel="nofollow noreferrer">Part 3: Shifting focus to the first available element in WPF</a></li>
</ul>

They are all good to read, but the 3rd part specifically deals with setting focus to a UI element in a UserControl.

blocks|key|4570200|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4570201|“在应用程序启动时设置初始焦点时，要接收焦点的元素必须连接到PresentationSource，并且该元素必须具有可聚焦且IsVisible设置为true。建议在已加载的事件处理程序中设置初始焦点。“|blockquote|4570202|4570203|4570204|(MSDN)|4570205|只需在窗口(或控件)的构造函数中添加一个“已加载”的事件处理程序，然后在该事件处理程序中调用目标控件上的Focus()方法。|4570206|++++public+MyWindow()+{
++++++++InitializeComponent();
++++++++this.Loaded+%2B=+new+RoutedEventHandler(MyWindow_Loaded);
++++}

++++void+MyWindow_Loaded(object+sender,+RoutedEventArgs+e)+{
++++++++textBox.Focus();
++++}|code-block|syntax|javascript|4570207|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|-4|4|5|6|Q|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|R|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|S|7|@]|8|@]|9|$]]|$1|E|3|-4|4|5|6|T|7|@]|8|@]|9|$]]|$1|F|3|G|4|5|6|U|7|@]|8|@]|9|$]]|$1|H|3|I|4|5|6|V|7|@]|8|@]|9|$]]|$1|J|3|K|4|L|6|W|7|@]|8|@]|9|$M|N]]|$1|O|3|-4|4|5|6|X|7|@]|8|@]|9|$]]]|P|$]]

<blockquote>
“When setting initial focus at application startup, the element to
receive focus must be connected to a PresentationSource and the
element must have Focusable and IsVisible set to true. The recommended
place to set initial focus is in the Loaded event handler&quot;
</blockquote>
(MSDN)
Simply add a &quot;Loaded&quot; event handler in the constructor of your Window (or Control), and in that event handler call the Focus() method on the target control.
<pre><code> public MyWindow() {
 InitializeComponent();
 this.Loaded += new RoutedEventHandler(MyWindow_Loaded);
 }

 void MyWindow_Loaded(object sender, RoutedEventArgs e) {
 textBox.Focus();
 }
</code></pre>

blocks|key|1113270|text|在经历了一个“WPF初始焦点噩梦”之后，根据堆栈上的一些答案，以下内容被证明是我最好的解决方案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1113271|首先，添加您的App.xaml+OnStartup()如下：|1113272|EventManager.RegisterClassHandler(typeof(Window),+Window.LoadedEvent,
++++++++++new+RoutedEventHandler(WindowLoaded));|code-block|syntax|javascript|1113273|然后在App.xaml中添加'WindowLoaded‘事件：|1113274|void+WindowLoaded(object+sender,+RoutedEventArgs+e)
++++{
++++++++var+window+=+e.Source+as+Window;
++++++++System.Threading.Thread.Sleep(100);
++++++++window.Dispatcher.Invoke(
++++++++new+Action(()+=>
++++++++{
++++++++++++window.MoveFocus(new+TraversalRequest(FocusNavigationDirection.First));

++++++++}));
++++}|1113275|线程问题必须作为WPF的初始焦点使用，由于某些框架竞争条件，大多数情况下都会失败。|1113276|我发现下面的解决方案是最好的，因为它在整个应用程序中全局使用。|1113277|希望这能帮上忙。|1113278|橙色|1113279|entityMap^0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|10|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|11|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|12|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|13|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|14|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

After having a 'WPF Initial Focus Nightmare' and based on some answers on stack, the following proved for me to be the best solution. 

First, add your App.xaml OnStartup() the followings:

<pre><code>EventManager.RegisterClassHandler(typeof(Window), Window.LoadedEvent,
 new RoutedEventHandler(WindowLoaded));
</code></pre>

Then add the 'WindowLoaded' event also in App.xaml : 

<pre><code>void WindowLoaded(object sender, RoutedEventArgs e)
 {
 var window = e.Source as Window;
 System.Threading.Thread.Sleep(100);
 window.Dispatcher.Invoke(
 new Action(() =&gt;
 {
 window.MoveFocus(new TraversalRequest(FocusNavigationDirection.First));

 }));
 }
</code></pre>

The threading issue must be use as WPF initial focus mostly fails due to some framework race conditions.

I found the following solution best as it is used globally for the whole app.

Hope it helps...

Oran

blocks|key|3725186|text|我有一个带有两个文本boxes.The文本框的用户控制堆栈面板是在构造器中添加的，而不是在xaml中添加的。当我尝试聚焦第一个文本框时，什么也没有发生。带有已加载事件的签名解决了我的问题。只是在已加载的事件和其他东西中调用了control.Focus()。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3725187|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I have user control - stack panel with two text boxes.The text boxes were added in contructor, not in the xaml. When i try to focus first text box, nothing happend.
The siggestion with Loaded event fix my problem. Just called control.Focus() in Loaded event and everthing.

blocks|key|3725204|text|假设你想要为用户名文本框设置焦点，这样用户就可以在每次显示时直接输入。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3725205|在控件的构造函数中：|3725206|this.Loaded+%2B=+(sender,+e)+=>+Keyboard.Focus(txtUsername);|code-block|syntax|javascript|3725207|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Assuming you want to set focus for Username textbox, thus user can type in directly every time it shows up.

In Constructor of your control:

<pre><code>this.Loaded += (sender, e) =&gt; Keyboard.Focus(txtUsername);
</code></pre>

blocks|key|505263|text|我在WPF用户控件中将键盘焦点设置为canvas时也遇到了同样的问题。我的解决方案|type|unstyled|depth|inlineStyleRanges|entityRanges|data|505264|将XAML中的事件set+element设置为Focusable="True"|offset|length|style|CODE|505265|In+|unordered-list-item|505266|+create+element_mousemove+|ordered-list-item|505267|：|505268|505269|505270|如果(！element.IsKeyBoardFocused)+element.Focus();|505271|在我的情况下，它工作得很好。|505272|entityMap^0|0|N|G|0|0|8|H|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Y|8|@$D|Z|E|10|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|11|8|@]|9|@]|A|$]]|$1|K|3|L|5|M|7|12|8|@$D|13|E|14|F|G]]|9|@]|A|$]]|$1|N|3|O|5|M|7|15|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|16|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|18|8|@]|9|@]|A|$]]|$1|T|3|U|5|6|7|19|8|@]|9|@]|A|$]]|$1|V|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|W|$]]

I had same problem with setting keyboard focus to canvas in WPF user control.
My solution 

<ol>
<li>In XAML set element to <code>Focusable="True"</code></li>
<li>In <code>element_mousemove</code> event create simple check:

<pre><code>if(!element.IsKeyBoardFocused)
 element.Focus();
</code></pre></li>
</ol>

In my case it works fine.

blocks|key|1113403|text|在尝试了以上建议的组合后，我能够可靠地将焦点分配给子UserControl上所需的文本框，如下所示。基本上，将焦点放在子控件上，让子UserControl将焦点放在它的TextBox上。TextBox的focus语句本身返回true，但是直到UserControl也获得了focus，才会产生所需的结果。我还应该注意到，UserControl无法为自己请求焦点，只能由窗口提供。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1113404|为简洁起见，我省略了在窗口和UserControl上注册已加载的事件。|1113405|窗户|1113406|private+void+OnWindowLoaded(object+sender,+RoutedEventArgs+e)
{
++++ControlXYZ.Focus();
}|code-block|syntax|javascript|1113407|UserControl|1113408|private+void+OnControlLoaded(object+sender,+RoutedEventArgs+e)
{
++++TextBoxXYZ.Focus();
}|1113409|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|S|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|T|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|H|7|V|8|@]|9|@]|A|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

After trying combinations of the suggestions above, I was able to reliably assign focus to a desired text box on a child UserControl with the following. Basically, give focus to the child control and have the child UserControl give focus to its TextBox. The TextBox's focus statement returned true by itself, however did not yield the desired result until the UserControl was given focus as well. I should also note that the UserControl was unable to request focus for itself and had to be given by the Window.

For brevity I left out registering the Loaded events on the Window and UserControl.

Window

<pre><code>private void OnWindowLoaded(object sender, RoutedEventArgs e)
{
 ControlXYZ.Focus();
}
</code></pre>

UserControl

<pre><code>private void OnControlLoaded(object sender, RoutedEventArgs e)
{
 TextBoxXYZ.Focus();
}
</code></pre>

blocks|key|3725374|text|我在PageLoaded()或加载的控件中设置了它，但随后我调用了WCF异步服务，并做了一些似乎失去焦点的事情。我必须在我做的所有事情的最后设置它。这很好，但有时我更改了代码，然后我忘记了我也设置了光标。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3725375|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I set it in the PageLoaded() or control loaded, but then I'm calling WCF async service and doing stuff that seems to lose the focus. I have to to set it at the end of all the stuff I do. That's fine and all, but sometimes I make changes to the code and then I forget that I'm also setting the cursor.

blocks|key|4570571|text|由于我尝试了fuzquat的解决方案，发现它是最通用的，我想我应该分享一个不同的版本，因为有些人抱怨它看起来很乱。所以就是这样：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4570572|++++++++++++++++casted.Dispatcher.BeginInvoke(new+Action<UIElement>(x+=>
++++++++++++++++{
++++++++++++++++++++x.Focus();
++++++++++++++++}),+DispatcherPriority.ApplicationIdle,+casted);|code-block|syntax|javascript|4570573|没有Thread.Sleep，就没有ThreadPool。我希望足够干净。我真的需要一些代表，这样我就可以评论别人的解决方案了。|4570574|更新：|4570575|因为人们似乎喜欢漂亮的代码：|4570576|public+static+class+WpfExtensions
{
++++public+static+void+BeginInvoke<T>(this+T+element,+Action<T>+action,+DispatcherPriority+priority+=+DispatcherPriority.ApplicationIdle)+where+T+:+UIElement
++++{
++++++++element.Dispatcher.BeginInvoke(priority,+action);
++++}
}|4570577|现在你可以这样叫它：|4570578|child.BeginInvoke(d+=>+d.Focus());|4570579|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|Y|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|10|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

since i tried a fuzquat's solution and found it the most generic one, i thought i'd share a different version, since some complained about it looking messy. so here it is:

<pre><code> casted.Dispatcher.BeginInvoke(new Action&lt;UIElement&gt;(x =&gt;
 {
 x.Focus();
 }), DispatcherPriority.ApplicationIdle, casted);
</code></pre>

no Thread.Sleep, no ThreadPool. Clean enough i hope. Could really use some rep so i can comment on other peoples solutions.

UPDATE:

Since people seem to like pretty code:

<pre><code>public static class WpfExtensions
{
 public static void BeginInvoke&lt;T&gt;(this T element, Action&lt;T&gt; action, DispatcherPriority priority = DispatcherPriority.ApplicationIdle) where T : UIElement
 {
 element.Dispatcher.BeginInvoke(priority, action);
 }
}
</code></pre>

now you can call it like this:

<pre><code>child.BeginInvoke(d =&gt; d.Focus());
</code></pre>

blocks|key|4570612|text|我不喜欢为UserControl设置另一个标签范围的解决方案。在这种情况下，当通过键盘导航时，您将有两个不同的插入符号:在窗口上和另一个-内部用户控件。我的解决方案是简单地将焦点从用户控件重定向到内部子控件。设置用户控件可焦点(因为默认情况下为false)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4570613|<UserControl+.....+Focusable="True">|code-block|syntax|javascript|4570614|并覆盖代码隐藏中的焦点事件处理程序：|4570615|protected+override+void+OnGotFocus(RoutedEventArgs+e)
{
++++base.OnGotFocus(e);
++++MyTextBox.Focus();
}

protected+override+void+OnGotKeyboardFocus(KeyboardFocusChangedEventArgs+e)
{
++++base.OnGotKeyboardFocus(e);
++++Keyboard.Focus(MyTextBox);
}|4570616|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I don't like solutions with setting another tab scope for UserControl. In that case, you will have two different carets when navigating by keyboard: on the window and the another - inside user control. My solution is simply to redirect focus from user control to inner child control. Set user control focusable (because by default its false):

<pre><code>&lt;UserControl ..... Focusable="True"&gt;
</code></pre>

and override focus events handlers in code-behind:

<pre><code>protected override void OnGotFocus(RoutedEventArgs e)
{
 base.OnGotFocus(e);
 MyTextBox.Focus();
}

protected override void OnGotKeyboardFocus(KeyboardFocusChangedEventArgs e)
{
 base.OnGotKeyboardFocus(e);
 Keyboard.Focus(MyTextBox);
}
</code></pre>

blocks|key|1113493|text|给我带来好处的是FocusManager.FocusedElement属性。我首先尝试在UserControl上设置它，但它不起作用。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1113494|所以我试着把它放在UserControl的第一个子控件上：|1113495|<UserControl+x:Class="WpfApplication3.UserControl1"
+++++++++xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+++++++++xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Grid+FocusManager.FocusedElement="{Binding+ElementName=MyTextBox,+Mode=OneWay}">
++++<TextBox+x:Name="MyTextBox"/>
</Grid>|code-block|syntax|javascript|1113496|​|1113497|..。它成功了！:)|1113498|entityMap^0|8|R|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|W|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|X|8|@]|D|@]|E|$]]|$1|O|3|P|5|6|7|Y|8|@]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|R|$]]

What did the trick for me was the FocusManager.FocusedElement attribute. I first tried to set it on the UserControl, but it didn't work.

So I tried putting it on the UserControl's first child instead:

<pre><code>&lt;UserControl x:Class="WpfApplication3.UserControl1"
 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"&gt;
&lt;Grid FocusManager.FocusedElement="{Binding ElementName=MyTextBox, Mode=OneWay}"&gt;
 &lt;TextBox x:Name="MyTextBox"/&gt;
&lt;/Grid&gt;
</code></pre>



... and it worked! :)

blocks|key|4570676|text|我将fuzquat的答案转换为扩展方法。我使用的是这个函数，而不是Focus()函数，因为Focus()函数无效。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4570677|using+System;
using+System.Threading;
using+System.Windows;

namespace+YourProject.Extensions
{
++++public+static+class+UIElementExtension
++++{
++++++++public+static+void+WaitAndFocus(this+UIElement+element,+int+ms+=+100)
++++++++{
++++++++++++ThreadPool.QueueUserWorkItem(f+=>
++++++++++++{
++++++++++++++++Thread.Sleep(ms);

++++++++++++++++element.Dispatcher.Invoke(new+Action(()+=>
++++++++++++++++{
++++++++++++++++++++element.Focus();
++++++++++++++++}));
++++++++++++});
++++++++}
++++}
}|code-block|syntax|javascript|4570678|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|$]]

I converted fuzquat's answer to an extension method. I'm using this instead of Focus() where Focus() did not work.

<pre><code>using System;
using System.Threading;
using System.Windows;

namespace YourProject.Extensions
{
 public static class UIElementExtension
 {
 public static void WaitAndFocus(this UIElement element, int ms = 100)
 {
 ThreadPool.QueueUserWorkItem(f =&gt;
 {
 Thread.Sleep(ms);

 element.Dispatcher.Invoke(new Action(() =&gt;
 {
 element.Focus();
 }));
 });
 }
 }
}
</code></pre>

I have a <code>UserControl</code> which contains a <code>TextBox</code>. When my main window loads I want to set the focus to this textbox so I added <code>Focusable="True" GotFocus="UC_GotFocus"</code> to the <code>UserControl</code>s definition and <code>FocusManager.FocusedElement="{Binding ElementName=login}"</code> to my main windows definition. In the <code>UC_GotFocus</code> method i simply call <code>.Focus()</code> on the control i want to focus on but this doesn't work.

All i need to do is have a <code>TextBox</code> in a <code>UserControl</code> receive focus when the application starts.

Any help would be appreciated, thanks.

Can't set focus to a child of UserControl

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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我有一个包含TextBox的UserControl。当我的主窗口加载时，我想将焦点设置到这个文本框上，所以我将Focusable="True" GotFocus="UC_GotFocus"添加到UserControl的定义中，并将FocusManager.FocusedElement="{Binding Element...

问无法将焦点设置到UserControl的子级
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问无法将焦点设置到UserControl的子级EN