我有一个包含文本框和按钮的WPF用户控件。我有一个包含网格的表单 第一行包含文本框 第二行包含如上所述的用户控件和 第3行包含另一个文本框。 当表单加载时，焦点设置为第1行中的文本框。 当焦点设置为用户控件时，我需要将焦点设置到用户控件内的文本框。并且在标签上，焦点应设置为用户控件内的按钮。
答案 0 :(得分：0)
处理用户控件中的GotFocus事件，并使用Focus方法将焦点设置为文本框。您可以使用KeyboardNavigation.TabIndex在用户控件中明确设置标签顺序。
答案 1 :(得分：0)
您的代码是否遵循MVVM模式？如果是，直接在后面的视图代码中编写事件处理程序可能不是一个好主意，它打破了MVVM中关注点的分离。而是创建行为类并在行为中编写事件处理程序，并将行为绑定到视图中的用户控件。
示例代码如下所示。我有一个Canvas和内部cavas我有三个文本框。当卡瓦斯加载时，我需要将焦点设置在第一个文本框内。类似于你的场景。
行为代码
public class CanvasLoadedBehavior : Behavior<Canvas>
{
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);
}
}
}
查看将cavas绑定到行为的代码。
<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="^[0-9]+$" MaxLength="15" />
</i:Interaction.Behaviors>
</wpf:AutoCompleteTextBox>
<!--<Label Style="{StaticResource Devlbl}" Canvas.Left="710" Content="Duration" Canvas.Top="79" />-->
<!--<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}">
</ComboBox>-->
<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>