blocks|key|1567948|text|我有了一个聪明的想法，通过Reflector挖掘，看看在哪里使用了可聚焦属性，并找到了解决方案的方法。我只需要将以下代码添加到我的窗口的构造函数中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1567949|Loaded+%2B=+(sender,+e)+=>
++++MoveFocus(new+TraversalRequest(FocusNavigationDirection.First));|code-block|syntax|javascript|1567950|这将自动选择Tab键顺序中的第一个控件，因此这是一个通用的解决方案，应该能够放到任何窗口中并正常工作。|1567951|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I had the bright idea to dig through Reflector to see where the Focusable property is used, and found my way to this solution. I just need to add the following code to my Window's constructor:

<pre><code>Loaded += (sender, e) =&gt;
 MoveFocus(new TraversalRequest(FocusNavigationDirection.First));
</code></pre>

This will automatically select the first control in the tab order, so it's a general solution that should be able to be dropped into any window and Just Work.

blocks|key|1352634|text|我找到了另一个可能的解决方案。Mark+Smith发布了一个用于FocusManager.FocusedElement的FirstFocusedElement+markup+extension。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1352635|<UserControl+x:Class="FocusTest.Page2"
++++xmlns:FocusTest="clr-namespace:FocusTest"
++++FocusManager.FocusedElement="{FocusTest:FirstFocusedElement}">|code-block|syntax|javascript|1352636|entityMap|0|LINK|mutability|MUTABLE|url|https://markjulmar.github.io/wpf/2008/09/12/part-3-shifting-focus-to-the-first-available-element-in-wpf.html^0|1O|10|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

I found another possible solution. Mark Smith posted a <a href="https://markjulmar.github.io/wpf/2008/09/12/part-3-shifting-focus-to-the-first-available-element-in-wpf.html" rel="nofollow noreferrer">FirstFocusedElement markup extension</a> for use with FocusManager.FocusedElement.
<pre><code>&lt;UserControl x:Class=&quot;FocusTest.Page2&quot;
 xmlns:FocusTest=&quot;clr-namespace:FocusTest&quot;
 FocusManager.FocusedElement=&quot;{FocusTest:FirstFocusedElement}&quot;&gt;
</code></pre>

blocks|key|1568004|text|这也是可行的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1568005|<Window+FocusManager.FocusedElement="{Binding+ElementName=SomeElement}">

+++<DataGrid+x:Name="SomeElement">
+++++...
+++</DataGrid>
</Window>|code-block|syntax|javascript|1568006|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|$]]

This works, too:

<pre><code>&lt;Window FocusManager.FocusedElement="{Binding ElementName=SomeElement}"&gt;

 &lt;DataGrid x:Name="SomeElement"&gt;
 ...
 &lt;/DataGrid&gt;
&lt;/Window&gt;
</code></pre>

blocks|key|1352728|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|1352729|首先，添加您的App.xaml+OnStartup()如下：|1352730|EventManager.RegisterClassHandler(typeof(Window),+Window.LoadedEvent,
++++++++++new+RoutedEventHandler(WindowLoaded));|code-block|syntax|javascript|1352731|然后在App.xaml中添加'WindowLoaded‘事件：|1352732|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));

++++++++}));
++++}|1352733|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。|1352734|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。|1352735|希望这能帮上忙。|1352736|橙色|1352737|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|1352793|text|基于作为附加行为实现的已接受answer：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1352794|using+System.Windows;
using+System.Windows.Controls;
using+System.Windows.Input;

namespace+UI.Behaviors
{
++++public+static+class+FocusBehavior
++++{
++++++++public+static+readonly+DependencyProperty+FocusFirstProperty+=
++++++++++++DependencyProperty.RegisterAttached(
++++++++++++++++"FocusFirst",
++++++++++++++++typeof(bool),
++++++++++++++++typeof(FocusBehavior),
++++++++++++++++new+PropertyMetadata(false,+OnFocusFirstPropertyChanged));

++++++++public+static+bool+GetFocusFirst(Control+control)
++++++++{
++++++++++++return+(bool)control.GetValue(FocusFirstProperty);
++++++++}

++++++++public+static+void+SetFocusFirst+(Control+control,+bool+value)
++++++++{
++++++++++++control.SetValue(FocusFirstProperty,+value);
++++++++}

++++++++static+void+OnFocusFirstPropertyChanged(
++++++++++++DependencyObject+obj,+DependencyPropertyChangedEventArgs+args)
++++++++{
++++++++++++Control+control+=+obj+as+Control;
++++++++++++if+(control+==+null+%7C%7C+!(args.NewValue+is+bool))
++++++++++++{
++++++++++++++++return;
++++++++++++}

++++++++++++if+((bool)args.NewValue)
++++++++++++{
++++++++++++++++control.Loaded+%2B=+(sender,+e)+=>
++++++++++++++++++++control.MoveFocus(new+TraversalRequest(FocusNavigationDirection.Next));
++++++++++++}
++++++++}
++++}
}|code-block|syntax|javascript|1352795|像这样使用它：|1352796|<Window+xmlns:Behaviors="clr-namespace:UI.Behaviors"
++++++++Behaviors:FocusBehavior.FocusFirst="true">|1352797|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/818536/56763^0|E|6|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|10|8|@]|9|@]|C|$G|H]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

Based on the accepted <a href="https://stackoverflow.com/a/818536/56763">answer</a> implemented as an attached behavior:

<pre><code>using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;

namespace UI.Behaviors
{
 public static class FocusBehavior
 {
 public static readonly DependencyProperty FocusFirstProperty =
 DependencyProperty.RegisterAttached(
 "FocusFirst",
 typeof(bool),
 typeof(FocusBehavior),
 new PropertyMetadata(false, OnFocusFirstPropertyChanged));

 public static bool GetFocusFirst(Control control)
 {
 return (bool)control.GetValue(FocusFirstProperty);
 }

 public static void SetFocusFirst (Control control, bool value)
 {
 control.SetValue(FocusFirstProperty, value);
 }

 static void OnFocusFirstPropertyChanged(
 DependencyObject obj, DependencyPropertyChangedEventArgs args)
 {
 Control control = obj as Control;
 if (control == null || !(args.NewValue is bool))
 {
 return;
 }

 if ((bool)args.NewValue)
 {
 control.Loaded += (sender, e) =&gt;
 control.MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));
 }
 }
 }
}
</code></pre>

Use it like this:

<pre><code>&lt;Window xmlns:Behaviors="clr-namespace:UI.Behaviors"
 Behaviors:FocusBehavior.FocusFirst="true"&gt;
</code></pre>

blocks|key|1352801|text|<Window+FocusManager.FocusedElement="{Binding+ElementName=yourControlName}">|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1352802|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>&lt;Window FocusManager.FocusedElement="{Binding ElementName=yourControlName}"&gt;
</code></pre>

blocks|key|1352873|text|用简单的方法解决了同样的问题:在主窗口中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1352874|++<Window+....
++++++++FocusManager.FocusedElement="{Binding+ElementName=usercontrolelementname}"
+++++++++...+/>|code-block|syntax|javascript|1352875|在用户控件中：|1352876|private+void+UserControl_GotFocus_1(object+sender,+RoutedEventArgs+e)
++++++++{
++++++++++++targetcontrol.Focus();
++++++++++++this.GotFocus+-=+UserControl_GotFocus_1;++//+to+set+focus+only+once
++++++++}|1352877|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|$]]

Had same problem solved it with simple solution:
In the main window:

<pre><code> &lt;Window ....
 FocusManager.FocusedElement="{Binding ElementName=usercontrolelementname}"
 ... /&gt;
</code></pre>

In the user control:

<pre><code>private void UserControl_GotFocus_1(object sender, RoutedEventArgs e)
 {
 targetcontrol.Focus();
 this.GotFocus -= UserControl_GotFocus_1; // to set focus only once
 }
</code></pre>

blocks|key|1352951|text|您可以轻松地将控件集本身作为XAML中的焦点元素。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1352952|<Window>
+++<DataGrid+FocusManager.FocusedElement="{Binding+RelativeSource={RelativeSource+Self}}">
+++++...
+++</DataGrid>
</Window>|code-block|syntax|javascript|1352953|我从来没有尝试过在用户控件中设置它，看看它是否有效，但它可能会起作用。|1352954|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

You can easily have the control set itself as the focused element in XAML.

<pre><code>&lt;Window&gt;
 &lt;DataGrid FocusManager.FocusedElement="{Binding RelativeSource={RelativeSource Self}}"&gt;
 ...
 &lt;/DataGrid&gt;
&lt;/Window&gt;
</code></pre>

I've never tried setting this in a usercontrol and seeing if this works, but it may.

blocks|key|1353013|text|我也面临着同样的问题。我在画布容器中有三个文本框，并希望在打开用户控件时将第一个文本框作为焦点。WPF代码遵循MVVM模式。我创建了一个单独的行为类来聚焦元素，并将其绑定到我的视图，如下所示。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1353014|画布行为代码|1353015|public++class+CanvasLoadedBehavior+:+Behavior<Canvas>
{
++++private+Canvas+_canvas;
++++protected+override+void+OnAttached()
++++{
++++++++base.OnAttached();
++++++++_canvas+=+AssociatedObject+as+Canvas;
++++++++if+(_canvas.Name+==+"ReturnRefundCanvas")
++++++++{

++++++++++++_canvas.Loaded+%2B=+_canvas_Loaded;
++++++++}


++++}

++++void+_canvas_Loaded(object+sender,+RoutedEventArgs+e)
++++{
++++++++FocusNavigationDirection+focusDirection+=+FocusNavigationDirection.Next;

++++++++//+MoveFocus+takes+a+TraveralReqest+as+its+argument.
++++++++TraversalRequest+request+=+new+TraversalRequest(focusDirection);
++++++++UIElement+elementWithFocus+=+Keyboard.FocusedElement+as+UIElement;
++++++++if+(elementWithFocus+!=+null)
++++++++{
++++++++++++elementWithFocus.MoveFocus(request);
++++++++}

++++}

}|code-block|syntax|javascript|1353016|视图的代码|1353017|<Canvas++Name="ReturnRefundCanvas"+Height="200"+Width="1466"+DataContext="{Binding+RefundSearchViewModel}">
++++++++++++++++<i:Interaction.Behaviors>
++++++++++++++++++++<b:CanvasLoadedBehavior+/>
++++++++++++++++</i:Interaction.Behaviors>
++++++++++++++++<uc:Keyboard+Canvas.Left="973"+Canvas.Top="111"+ToolTip="Keyboard"+RenderTransformOrigin="-2.795,9.787"></uc:Keyboard>
++++++++++++++++<Label++Style="{StaticResource+Devlbl}"+Canvas.Left="28"+Content="Return+and+Refund+Search"+Canvas.Top="10"+/>
++++++++++++++++<Image+Height="30"+Width="28"+Canvas.Top="6"+Canvas.Left="5"+Source="pack://application:,,,/HomaKiosk;component/images/searchF.png">
++++++++++++++++++++<Image.OpacityMask>
++++++++++++++++++++++++<ImageBrush+ImageSource="pack://application:,,,/HomaKiosk;component/images/searchF.png"/>
++++++++++++++++++++</Image.OpacityMask>
++++++++++++++++</Image>

++++++++++++++++<Separator+Height="4"+Canvas.Left="6"+Margin="0"+Canvas.Top="35"+Width="1007"/>

++++++++++++++++<ContentControl+Canvas.Top="45"+Canvas.Left="21"
++++++++++++++++++++ContentTemplate="{StaticResource+ErrorMsg}"
++++++++++++++++++++Visibility="{Binding+Error,+Converter={c:StringNullOrEmptyToVisibilityConverter}}"+
++++++++++++++++++++Content="{Binding+Error}"+Width="992"></ContentControl>

++++++++++++++++<Label++Style="{StaticResource+Devlbl}"+Canvas.Left="29"+Name="FirstName"+Content="First+Name"+Canvas.Top="90"+/>
++++++++++++++++<wpf:AutoCompleteTextBox++Style="{StaticResource+AutoComp}"+Height="32"+Canvas.Left="33"+ToolTip="First+Name"++Canvas.Top="120"+Width="205"+++++++++++++++++++++Padding="10,5"+TabIndex="1001"
++++++++++++++++++++VerticalAlignment="Top"

++++++++++++++++++++Watermark=""
++++++++++++++++++++IconPlacement="Left"
++++++++++++++++++++IconVisibility="Visible"
++++++++++++++++++++Delay="100"

++++++++++++++++++++Text="{Binding+FirstName,+Mode=TwoWay,+TargetNullValue=''}"+
++++++++++++++++++++Provider="{Binding+FirstNameSuggestions}">
++++++++++++++++++++<wpf:AutoCompleteTextBox.ItemTemplate>
++++++++++++++++++++++++<DataTemplate>
++++++++++++++++++++++++++++<Border+Padding="5">
++++++++++++++++++++++++++++++++<StackPanel+Orientation="Vertical">
++++++++++++++++++++++++++++++++++++<TextBlock+Text="{Binding}"
+++++++++++++++++++FontWeight="Bold"+/>
++++++++++++++++++++++++++++++++</StackPanel>
++++++++++++++++++++++++++++</Border>
++++++++++++++++++++++++</DataTemplate>
++++++++++++++++++++</wpf:AutoCompleteTextBox.ItemTemplate>
++++++++++++++++</wpf:AutoCompleteTextBox>

++++++++++++++++<Label+Style="{StaticResource+Devlbl}"+Canvas.Left="250"+Content="Last+Name"+Canvas.Top="90"+/>
++++++++++++++++<wpf:AutoCompleteTextBox++Style="{StaticResource+AutoComp}"+Height="32"+ToolTip="Last+Name"+Canvas.Left="250"++Canvas.Top="120"+Width="205"+Padding="10,5"++TabIndex="1002"
++++++++++++++++++++VerticalAlignment="Top"
++++++++++++++++++++Watermark=""
++++++++++++++++++++IconPlacement="Left"
++++++++++++++++++++IconVisibility="Visible"
++++++++++++++++++++Delay="100"
+++++++++++++++++++Text="{Binding+LastName,+Mode=TwoWay,+TargetNullValue=''}"+
++++++++++++++++++++Provider="{Binding+LastNameSuggestions}">
++++++++++++++++++++<wpf:AutoCompleteTextBox.ItemTemplate>
++++++++++++++++++++++++<DataTemplate>
++++++++++++++++++++++++++++<Border+Padding="5">
++++++++++++++++++++++++++++++++<StackPanel+Orientation="Vertical">
++++++++++++++++++++++++++++++++++++<TextBlock+Text="{Binding}"
+++++++++++++++++++FontWeight="Bold"+/>
++++++++++++++++++++++++++++++++</StackPanel>
++++++++++++++++++++++++++++</Border>
++++++++++++++++++++++++</DataTemplate>
++++++++++++++++++++</wpf:AutoCompleteTextBox.ItemTemplate>
++++++++++++++++</wpf:AutoCompleteTextBox>

++++++++++++++++<Label+Style="{StaticResource+Devlbl}"+Canvas.Left="480"+Content="Receipt+No"+Canvas.Top="90"+/>
+++++++++++++++++++++++++++++<wpf:AutoCompleteTextBox++Style="{StaticResource+AutoComp}"+Height="32"+ToolTip="Receipt+No"+Canvas.Left="480"++Canvas.Top="120"+Width="205"+Padding="10,5"++TabIndex="1002"
++++++++++++++++++++VerticalAlignment="Top"
++++++++++++++++++++Watermark=""
++++++++++++++++++++IconPlacement="Left"
++++++++++++++++++++IconVisibility="Visible"
++++++++++++++++++++Delay="100"
++++++++++++++++++++Text="{Binding+ReceiptNo,+Mode=TwoWay,+TargetNullValue=''}"+
++++++++++++++++++++Provider="{Binding+ReceiptIdSuggestions}">
++++++++++++++++++++<wpf:AutoCompleteTextBox.ItemTemplate>
++++++++++++++++++++++++<DataTemplate>
++++++++++++++++++++++++++++<Border+Padding="5">
++++++++++++++++++++++++++++++++<StackPanel+Orientation="Vertical"+>
++++++++++++++++++++++++++++++++++++<TextBlock+Text="{Binding}"
+++++++++++++++++++FontWeight="Bold">

++++++++++++++++++++++++++++++++++++</TextBlock>
++++++++++++++++++++++++++++++++</StackPanel>
++++++++++++++++++++++++++++</Border>
++++++++++++++++++++++++</DataTemplate>
++++++++++++++++++++</wpf:AutoCompleteTextBox.ItemTemplate>
++++++++++++++++++++<i:Interaction.Behaviors>
++++++++++++++++++++++++<b:AllowableCharactersTextBoxBehavior+RegularExpression="%5E[0-9]%2B$"+MaxLength="15"+/>
++++++++++++++++++++</i:Interaction.Behaviors>
++++++++++++++++</wpf:AutoCompleteTextBox>
++++++++++++++++
++++++++++++++++

++++++++++++++++<Button+Content="Search"+Style="{StaticResource+MyButton}"+ToolTip="Search"+
++++++++++++++++++++Canvas.Top="116"+Canvas.Left="710"+Cursor="Hand"+
++++++++++++++++++++Command="{Binding+SearchCommand}"+TabIndex="2001">
++++++++++++++++</Button>
++++++++++++++++<Button+Content="Clear"+Style="{StaticResource+MyButton}"++ToolTip="Clear"
++++++++++++++++++++Canvas.Top="116"+Canvas.Left="840"+Cursor="Hand"+
++++++++++++++++++++Command="{Binding+ClearCommand}"+TabIndex="2002">
++++++++++++++++</Button>
++++++++++++++++<Image+Height="25"+Width="25"+Canvas.Top="175"+Canvas.Left="25"+Source="pack://application:,,,/HomaKiosk;component/images/chkpending.png"/>
++++++++++++++++<Label++Style="{StaticResource+LegendLbl}"+Canvas.Left="50"+Content="Check+Returned+and+Payment+Pending"+Canvas.Top="178"+/>
++++++++++++++++<Image+Height="25"+Width="25"+Canvas.Top="175"+Canvas.Left="300"+Source="pack://application:,,,/HomaKiosk;component/images/chkrepaid.png"/>
++++++++++++++++<Label++Style="{StaticResource+LegendLbl}"+Canvas.Left="325"+Content="Repaid"+Canvas.Top="178"+/>
++++++++++++++++<Image+Height="25"+Width="25"+Canvas.Top="175"+Canvas.Left="395"+Source="pack://application:,,,/HomaKiosk;component/images/refund.png"/>
++++++++++++++++<Label++Style="{StaticResource+LegendLbl}"+Canvas.Left="415"+Content="Refunded"+Canvas.Top="178"+/>
+++++++++++++++++</Canvas>|1353018|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I also faced the same problem. I had three text boxes inside canvas container and wanted the first text box to be focused when the user control opens. WPF code followed MVVM pattern. I created a separate behavior class for focusing the element and binded it to my view like this.

Canvas behavior code

<pre><code>public class CanvasLoadedBehavior : Behavior&lt;Canvas&gt;
{
 private Canvas _canvas;
 protected override void OnAttached()
 {
 base.OnAttached();
 _canvas = AssociatedObject as Canvas;
 if (_canvas.Name == "ReturnRefundCanvas")
 {

 _canvas.Loaded += _canvas_Loaded;
 }


 }

 void _canvas_Loaded(object sender, RoutedEventArgs e)
 {
 FocusNavigationDirection focusDirection = FocusNavigationDirection.Next;

 // MoveFocus takes a TraveralReqest as its argument.
 TraversalRequest request = new TraversalRequest(focusDirection);
 UIElement elementWithFocus = Keyboard.FocusedElement as UIElement;
 if (elementWithFocus != null)
 {
 elementWithFocus.MoveFocus(request);
 }

 }

}
</code></pre>

Code for view

<pre><code>&lt;Canvas Name="ReturnRefundCanvas" Height="200" Width="1466" DataContext="{Binding RefundSearchViewModel}"&gt;
 &lt;i:Interaction.Behaviors&gt;
 &lt;b:CanvasLoadedBehavior /&gt;
 &lt;/i:Interaction.Behaviors&gt;
 &lt;uc:Keyboard Canvas.Left="973" Canvas.Top="111" ToolTip="Keyboard" RenderTransformOrigin="-2.795,9.787"&gt;&lt;/uc:Keyboard&gt;
 &lt;Label Style="{StaticResource Devlbl}" Canvas.Left="28" Content="Return and Refund Search" Canvas.Top="10" /&gt;
 &lt;Image Height="30" Width="28" Canvas.Top="6" Canvas.Left="5" Source="pack://application:,,,/HomaKiosk;component/images/searchF.png"&gt;
 &lt;Image.OpacityMask&gt;
 &lt;ImageBrush ImageSource="pack://application:,,,/HomaKiosk;component/images/searchF.png"/&gt;
 &lt;/Image.OpacityMask&gt;
 &lt;/Image&gt;

 &lt;Separator Height="4" Canvas.Left="6" Margin="0" Canvas.Top="35" Width="1007"/&gt;

 &lt;ContentControl Canvas.Top="45" Canvas.Left="21"
 ContentTemplate="{StaticResource ErrorMsg}"
 Visibility="{Binding Error, Converter={c:StringNullOrEmptyToVisibilityConverter}}" 
 Content="{Binding Error}" Width="992"&gt;&lt;/ContentControl&gt;

 &lt;Label Style="{StaticResource Devlbl}" Canvas.Left="29" Name="FirstName" Content="First Name" Canvas.Top="90" /&gt;
 &lt;wpf:AutoCompleteTextBox Style="{StaticResource AutoComp}" Height="32" Canvas.Left="33" ToolTip="First Name" Canvas.Top="120" Width="205" Padding="10,5" TabIndex="1001"
 VerticalAlignment="Top"

 Watermark=""
 IconPlacement="Left"
 IconVisibility="Visible"
 Delay="100"

 Text="{Binding FirstName, Mode=TwoWay, TargetNullValue=''}" 
 Provider="{Binding FirstNameSuggestions}"&gt;
 &lt;wpf:AutoCompleteTextBox.ItemTemplate&gt;
 &lt;DataTemplate&gt;
 &lt;Border Padding="5"&gt;
 &lt;StackPanel Orientation="Vertical"&gt;
 &lt;TextBlock Text="{Binding}"
 FontWeight="Bold" /&gt;
 &lt;/StackPanel&gt;
 &lt;/Border&gt;
 &lt;/DataTemplate&gt;
 &lt;/wpf:AutoCompleteTextBox.ItemTemplate&gt;
 &lt;/wpf:AutoCompleteTextBox&gt;

 &lt;Label Style="{StaticResource Devlbl}" Canvas.Left="250" Content="Last Name" Canvas.Top="90" /&gt;
 &lt;wpf:AutoCompleteTextBox Style="{StaticResource AutoComp}" Height="32" ToolTip="Last Name" Canvas.Left="250" Canvas.Top="120" Width="205" Padding="10,5" TabIndex="1002"
 VerticalAlignment="Top"
 Watermark=""
 IconPlacement="Left"
 IconVisibility="Visible"
 Delay="100"
 Text="{Binding LastName, Mode=TwoWay, TargetNullValue=''}" 
 Provider="{Binding LastNameSuggestions}"&gt;
 &lt;wpf:AutoCompleteTextBox.ItemTemplate&gt;
 &lt;DataTemplate&gt;
 &lt;Border Padding="5"&gt;
 &lt;StackPanel Orientation="Vertical"&gt;
 &lt;TextBlock Text="{Binding}"
 FontWeight="Bold" /&gt;
 &lt;/StackPanel&gt;
 &lt;/Border&gt;
 &lt;/DataTemplate&gt;
 &lt;/wpf:AutoCompleteTextBox.ItemTemplate&gt;
 &lt;/wpf:AutoCompleteTextBox&gt;

 &lt;Label Style="{StaticResource Devlbl}" Canvas.Left="480" Content="Receipt No" Canvas.Top="90" /&gt;
 &lt;wpf:AutoCompleteTextBox Style="{StaticResource AutoComp}" Height="32" ToolTip="Receipt No" Canvas.Left="480" Canvas.Top="120" Width="205" Padding="10,5" TabIndex="1002"
 VerticalAlignment="Top"
 Watermark=""
 IconPlacement="Left"
 IconVisibility="Visible"
 Delay="100"
 Text="{Binding ReceiptNo, Mode=TwoWay, TargetNullValue=''}" 
 Provider="{Binding ReceiptIdSuggestions}"&gt;
 &lt;wpf:AutoCompleteTextBox.ItemTemplate&gt;
 &lt;DataTemplate&gt;
 &lt;Border Padding="5"&gt;
 &lt;StackPanel Orientation="Vertical" &gt;
 &lt;TextBlock Text="{Binding}"
 FontWeight="Bold"&gt;

 &lt;/TextBlock&gt;
 &lt;/StackPanel&gt;
 &lt;/Border&gt;
 &lt;/DataTemplate&gt;
 &lt;/wpf:AutoCompleteTextBox.ItemTemplate&gt;
 &lt;i:Interaction.Behaviors&gt;
 &lt;b:AllowableCharactersTextBoxBehavior RegularExpression="^[0-9]+$" MaxLength="15" /&gt;
 &lt;/i:Interaction.Behaviors&gt;
 &lt;/wpf:AutoCompleteTextBox&gt;
 &lt;!--&lt;Label Style="{StaticResource Devlbl}" Canvas.Left="710" Content="Duration" Canvas.Top="79" /&gt;--&gt;
 &lt;!--&lt;ComboBox AllowDrop="True" Canvas.Left="710" ToolTip="Duration" Canvas.Top="107" Width="205" TabIndex="1004"
 Style="{StaticResource CommonComboBox}" 
 ItemsSource="{Binding Durations}" DisplayMemberPath="Description" SelectedValuePath="Id" SelectedValue="{Binding SelectedDate, Mode=TwoWay}"&gt;

 &lt;/ComboBox&gt;--&gt;

 &lt;Button Content="Search" Style="{StaticResource MyButton}" ToolTip="Search" 
 Canvas.Top="116" Canvas.Left="710" Cursor="Hand" 
 Command="{Binding SearchCommand}" TabIndex="2001"&gt;
 &lt;/Button&gt;
 &lt;Button Content="Clear" Style="{StaticResource MyButton}" ToolTip="Clear"
 Canvas.Top="116" Canvas.Left="840" Cursor="Hand" 
 Command="{Binding ClearCommand}" TabIndex="2002"&gt;
 &lt;/Button&gt;
 &lt;Image Height="25" Width="25" Canvas.Top="175" Canvas.Left="25" Source="pack://application:,,,/HomaKiosk;component/images/chkpending.png"/&gt;
 &lt;Label Style="{StaticResource LegendLbl}" Canvas.Left="50" Content="Check Returned and Payment Pending" Canvas.Top="178" /&gt;
 &lt;Image Height="25" Width="25" Canvas.Top="175" Canvas.Left="300" Source="pack://application:,,,/HomaKiosk;component/images/chkrepaid.png"/&gt;
 &lt;Label Style="{StaticResource LegendLbl}" Canvas.Left="325" Content="Repaid" Canvas.Top="178" /&gt;
 &lt;Image Height="25" Width="25" Canvas.Top="175" Canvas.Left="395" Source="pack://application:,,,/HomaKiosk;component/images/refund.png"/&gt;
 &lt;Label Style="{StaticResource LegendLbl}" Canvas.Left="415" Content="Refunded" Canvas.Top="178" /&gt;
 &lt;/Canvas&gt;
</code></pre>

blocks|key|1353071|text|用于C#+6%2B的Mizipzor's+answer的最低版本。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1353072|public+static+class+FocusBehavior
{
++++public+static+readonly+DependencyProperty+GiveInitialFocusProperty+=
++++++++DependencyProperty.RegisterAttached(
++++++++++++"GiveInitialFocus",
++++++++++++typeof(bool),
++++++++++++typeof(FocusBehavior),
++++++++++++new+PropertyMetadata(false,+OnFocusFirstPropertyChanged));

++++public+static+bool+GetGiveInitialFocus(Control+control)+=>+(bool)control.GetValue(GiveInitialFocusProperty);
++++public+static+void+SetGiveInitialFocus(Control+control,+bool+value)+=>+control.SetValue(GiveInitialFocusProperty,+value);

++++private+static+void+OnFocusFirstPropertyChanged(DependencyObject+obj,+DependencyPropertyChangedEventArgs+args)
++++{
++++++++var+control+=+obj+as+Control;

++++++++if+(control+==+null+%7C%7C+!(args.NewValue+is+bool))
++++++++++++return;

++++++++if+((bool)args.NewValue)
++++++++++++control.Loaded+%2B=+OnControlLoaded;
++++++++else
++++++++++++control.Loaded+-=+OnControlLoaded;
++++}

++++private+static+void+OnControlLoaded(object+sender,+RoutedEventArgs+e)+=>+((Control)sender).MoveFocus(new+TraversalRequest(FocusNavigationDirection.Next));
}|code-block|syntax|javascript|1353073|在XAML中使用：|1353074|<Window+local:FocusBehavior.GiveInitialFocus="True"+/>|1353075|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/8974420/24874^0|8|H|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|10|8|@]|9|@]|C|$G|H]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

A minimal version of <a href="https://stackoverflow.com/a/8974420/24874">Mizipzor's answer</a> for C# 6+.

<pre><code>public static class FocusBehavior
{
 public static readonly DependencyProperty GiveInitialFocusProperty =
 DependencyProperty.RegisterAttached(
 "GiveInitialFocus",
 typeof(bool),
 typeof(FocusBehavior),
 new PropertyMetadata(false, OnFocusFirstPropertyChanged));

 public static bool GetGiveInitialFocus(Control control) =&gt; (bool)control.GetValue(GiveInitialFocusProperty);
 public static void SetGiveInitialFocus(Control control, bool value) =&gt; control.SetValue(GiveInitialFocusProperty, value);

 private static void OnFocusFirstPropertyChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args)
 {
 var control = obj as Control;

 if (control == null || !(args.NewValue is bool))
 return;

 if ((bool)args.NewValue)
 control.Loaded += OnControlLoaded;
 else
 control.Loaded -= OnControlLoaded;
 }

 private static void OnControlLoaded(object sender, RoutedEventArgs e) =&gt; ((Control)sender).MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));
}
</code></pre>

Use in your XAML:

<pre><code>&lt;Window local:FocusBehavior.GiveInitialFocus="True" /&gt;
</code></pre>

blocks|key|1353142|text|如果你像我一样，你正在使用一些框架，不知何故，扰乱了基本的焦点行为，并使上面的所有解决方案都变得无关紧要，你仍然可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1353143|1-注意获得焦点的元素(不管它是什么！)|1353144|2-在xxx.xaml.cs后面的代码中添加以下内容|1353145|private+bool+_firstLoad;|code-block|syntax|javascript|1353146|3-在获得第一个焦点的元素上添加以下内容：|1353147|GotFocus="Element_GotFocus"|1353148|4-在后台代码中添加Element_GotFocus方法，并指定需要第一个焦点的WPF命名元素：|1353149|private+void+Element_GotFocus(object+sender,+RoutedEventArgs+e)
{
++++if(_firstLoad)
++++{
++++++++this.MyElementWithFistFocus.Focus();
++++++++_firstLoad+=+false;
++++}
}|1353150|5-管理加载的事件|1353151|在XAML中|1353152|Loaded="MyWindow_Loaded"+++|1353153|在xaml.cs中|1353154|private+void+MyWindow_Loaded(object+sender,+RoutedEventArgs+e)
{
++++++++_firstLoad+=+true;
++++++++this.Element_GotFocus(null,+null);
}|1353155|我希望这将有助于作为最后的解决方案|1353156|entityMap^0|0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|17|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|18|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|19|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|1A|8|@]|9|@]|A|$]]|$1|M|3|N|5|H|7|1B|8|@]|9|@]|A|$I|J]]|$1|O|3|P|5|6|7|1C|8|@]|9|@]|A|$]]|$1|Q|3|R|5|H|7|1D|8|@]|9|@]|A|$I|J]]|$1|S|3|T|5|6|7|1E|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|1F|8|@]|9|@]|A|$]]|$1|W|3|X|5|H|7|1G|8|@]|9|@]|A|$I|J]]|$1|Y|3|Z|5|6|7|1H|8|@]|9|@]|A|$]]|$1|10|3|11|5|H|7|1I|8|@]|9|@]|A|$I|J]]|$1|12|3|13|5|6|7|1J|8|@]|9|@]|A|$]]|$1|14|3|-4|5|6|7|1K|8|@]|9|@]|A|$]]]|15|$]]

If you are like me, and you are using some frameworks that, somehow, mess up with the basic focus behaviors, and make all solutions above irrelevant, you can still do this :

1 - Note the element which get the focus (whatever it is!)

2 - Add this in your code behind xxx.xaml.cs

<pre><code>private bool _firstLoad;
</code></pre>

3 - Add this on the element which get the first focus :

<pre><code>GotFocus="Element_GotFocus"
</code></pre>

4 - Add the Element_GotFocus method in the code behind, and specify the WPF named element who need the first focus :

<pre><code>private void Element_GotFocus(object sender, RoutedEventArgs e)
{
 if(_firstLoad)
 {
 this.MyElementWithFistFocus.Focus();
 _firstLoad = false;
 }
}
</code></pre>

5 - Manage the Loaded event

in XAML

<pre><code>Loaded="MyWindow_Loaded" 
</code></pre>

in xaml.cs

<pre><code>private void MyWindow_Loaded(object sender, RoutedEventArgs e)
{
 _firstLoad = true;
 this.Element_GotFocus(null, null);
}
</code></pre>

Hope this will help as a last resort solution

blocks|key|1568406|text|上面的解决方案没有像我预期的那样工作，我稍微改变了Mizipzor提出的行为如下：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1568407|从这一部分|1568408|if+((bool)args.NewValue)
++++++++{
++++++++++++control.Loaded+%2B=+(sender,+e)+=>
+++++++++++++++++++control.MoveFocus(new+TraversalRequest(FocusNavigationDirection.Next));
++++++++}|code-block|syntax|javascript|1568409|到这个|1568410|if+((bool)args.NewValue)
++++++++{
++++++++++++control.Loaded+%2B=+(sender,+e)+=>+control.Focus();
++++++++}|1568411|ANd我不会将这个行为附加到Window或UserControl上，但是为了控制，我想在开始时聚焦，例如：|1568412|<TextBox+ui:FocusBehavior.InitialFocus="True"+/>|1568413|哦，抱歉命名不同，我对附加的属性使用了InitialFocus名称。|1568414|这对我很有效，也许它可以帮助其他人。|1568415|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]]|$1|M|3|N|5|6|7|11|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|12|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|13|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|14|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

Above solution was not working as expected for me, I've changed slightly the behavior proposed by Mizipzor as following:

From this part

<pre><code>if ((bool)args.NewValue)
 {
 control.Loaded += (sender, e) =&gt;
 control.MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));
 }
</code></pre>

To this

<pre><code>if ((bool)args.NewValue)
 {
 control.Loaded += (sender, e) =&gt; control.Focus();
 }
</code></pre>

ANd I'm not attaching this behavior to Window or UserControl, but to control I want to focus initially, e.g.:

<pre><code>&lt;TextBox ui:FocusBehavior.InitialFocus="True" /&gt;
</code></pre>

Oh, sorry for different naming I'm using InitialFocus name for the attached property.

And this is working for me, maybe it could help someone else.

It seems that when a WPF application starts, nothing has focus.

This is really weird. Every other framework I've used does just what you'd expect: puts initial focus on the first control in the tab order. But I've confirmed that it's WPF, not just my app -- if I create a new Window, and just put a TextBox in it, and run the app, the TextBox doesn't have focus until I click on it or press Tab. Yuck.

My actual app is more complicated than just a TextBox. I have several layers of UserControls within UserControls. One of those UserControls has Focusable="True" and KeyDown/KeyUp handlers, and I want it to have the focus as soon as my window opens. I'm still somewhat of a WPF novice, though, and I'm not having much luck figuring out how to do this.

If I start my app and press the Tab key, then focus goes to my focusable control, and it starts working the way I want. But I don't want my users to have to hit Tab before they can start using the window.

I've played around with FocusManager.FocusedElement, but I'm not sure which control to set it on (the top-level Window? the parent that contains the focusable control? the focusable control itself?) or what to set it to.

What do I need to do to get my deeply-nested control to have initial focus as soon as the window opens? Or better yet, to focus the first focusable control in the tab order?

WPF and initial focus

似乎当WPF应用程序启动时，没有任何东西具有焦点。这真的很奇怪。我使用的所有其他框架都做了您所期望的事情:将初始焦点放在Tab键顺序中的第一个控件上。但我已经确认它是WPF，而不仅仅是我的应用程序--如果我创建一个新窗口，在其中放入一个TextBox，然后运行应用程序，TextBox直到我点击它或按Tab键时才有焦点。...

问WPF和初始焦点
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