Wpf 用户控制数字键盘

我在wpf中制作了一个用户控制数字键盘。我想知道我什么时候在表单上放置了控件。当我按下任何数字按钮时，应将其输入聚焦区域。怎么做 这是我的xaml脚本

在此处输入代码

        <RowDefinition Height="1*"/>
        <RowDefinition Height="1*"/>
        <RowDefinition Height="1*"/>
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="1*"/>
        <ColumnDefinition Width="1*"/>
        <ColumnDefinition/>
    </Grid.ColumnDefinitions>

    <Button Name="btn2" Content="2" Focusable="False"  FontSize="26"  HorizontalAlignment="Stretch"   VerticalAlignment="Stretch" Grid.Column="1" Grid.Row=" 1" />
    <Button Name="btn1" Content="1" Focusable="False" FontSize="26" HorizontalAlignment="Stretch"   Grid.Row="1" VerticalAlignment="Stretch" BorderBrush="DarkGray"  BorderThickness="4,2,2,8"  />
    <Button Name="btn3" Content="3" Focusable="False" FontSize="26" Grid.Column="2" Foreground="White"  HorizontalAlignment="Stretch"   Grid.Row="1" VerticalAlignment="Stretch"  />
    <Button Name="btn4" Content="4" Focusable="False"  FontSize="26" HorizontalAlignment="Stretch"   Grid.Row="2" VerticalAlignment="Stretch"  />
    <Button Name="btn5" Content="5" Focusable="False" FontSize="26" Grid.Column="1" HorizontalAlignment="Stretch"   Grid.Row="2" VerticalAlignment="Stretch"  />
    <Button Name="btn6" Content="6" Focusable="False" FontSize="26" Grid.Column="2" HorizontalAlignment="Stretch"  Grid.Row="2" VerticalAlignment="Stretch"  />
    <Button Name="btn7" Content="7" Focusable="False" FontSize="26" HorizontalAlignment="Stretch"   Grid.Row="3" VerticalAlignment="Stretch"  />
    <Button Name="btn8" Content="8" Focusable="False" FontSize="26" Grid.Column="1" HorizontalAlignment="Stretch"  Grid.Row="3" VerticalAlignment="Stretch"  />
    <Button Name="btn9" Content="9" Focusable="False" FontSize="26" Grid.Column="2" HorizontalAlignment="Stretch"   Grid.Row="3" VerticalAlignment="Stretch"   />
    <Button Name="btn0" Content="0" Focusable="False" FontSize="26" HorizontalAlignment="Stretch"  Grid.Row="4" VerticalAlignment="Stretch"  />
    <Button Name="btn00" Content="00" Focusable="False" FontSize="26" Grid.Column="1" HorizontalAlignment="Stretch"   Grid.Row="4" VerticalAlignment="Stretch"  />
    <Button Name="btn_dot" Content="." Focusable="False" FontSize="26" Grid.Column="2" HorizontalAlignment="Stretch"   Grid.Row="4" VerticalAlignment="Stretch"  />
    <Button Name="btn_temp1" Content="Button" Focusable="False" HorizontalAlignment="Stretch"  VerticalAlignment="Stretch" />
    <Button Name="btn_temp2" Content="Button" Focusable="False" Grid.Column="1" HorizontalAlignment="Stretch"  VerticalAlignment="Stretch" />
    <Button Name="btn_temp3" Content="Button" Focusable="False" Grid.Column="2" HorizontalAlignment="Stretch"   VerticalAlignment="Stretch"  />
</Grid>

---

``

您应该将事件处理程序附加到，以处理

UserControl

构造函数中WPF中的按键，或

加载的事件处理程序：

        <RowDefinition Height="1*"/>
        <RowDefinition Height="1*"/>
        <RowDefinition Height="1*"/>
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="1*"/>
        <ColumnDefinition Width="1*"/>
        <ColumnDefinition/>
    </Grid.ColumnDefinitions>

    <Button Name="btn2" Content="2" Focusable="False"  FontSize="26"  HorizontalAlignment="Stretch"   VerticalAlignment="Stretch" Grid.Column="1" Grid.Row=" 1" />
    <Button Name="btn1" Content="1" Focusable="False" FontSize="26" HorizontalAlignment="Stretch"   Grid.Row="1" VerticalAlignment="Stretch" BorderBrush="DarkGray"  BorderThickness="4,2,2,8"  />
    <Button Name="btn3" Content="3" Focusable="False" FontSize="26" Grid.Column="2" Foreground="White"  HorizontalAlignment="Stretch"   Grid.Row="1" VerticalAlignment="Stretch"  />
    <Button Name="btn4" Content="4" Focusable="False"  FontSize="26" HorizontalAlignment="Stretch"   Grid.Row="2" VerticalAlignment="Stretch"  />
    <Button Name="btn5" Content="5" Focusable="False" FontSize="26" Grid.Column="1" HorizontalAlignment="Stretch"   Grid.Row="2" VerticalAlignment="Stretch"  />
    <Button Name="btn6" Content="6" Focusable="False" FontSize="26" Grid.Column="2" HorizontalAlignment="Stretch"  Grid.Row="2" VerticalAlignment="Stretch"  />
    <Button Name="btn7" Content="7" Focusable="False" FontSize="26" HorizontalAlignment="Stretch"   Grid.Row="3" VerticalAlignment="Stretch"  />
    <Button Name="btn8" Content="8" Focusable="False" FontSize="26" Grid.Column="1" HorizontalAlignment="Stretch"  Grid.Row="3" VerticalAlignment="Stretch"  />
    <Button Name="btn9" Content="9" Focusable="False" FontSize="26" Grid.Column="2" HorizontalAlignment="Stretch"   Grid.Row="3" VerticalAlignment="Stretch"   />
    <Button Name="btn0" Content="0" Focusable="False" FontSize="26" HorizontalAlignment="Stretch"  Grid.Row="4" VerticalAlignment="Stretch"  />
    <Button Name="btn00" Content="00" Focusable="False" FontSize="26" Grid.Column="1" HorizontalAlignment="Stretch"   Grid.Row="4" VerticalAlignment="Stretch"  />
    <Button Name="btn_dot" Content="." Focusable="False" FontSize="26" Grid.Column="2" HorizontalAlignment="Stretch"   Grid.Row="4" VerticalAlignment="Stretch"  />
    <Button Name="btn_temp1" Content="Button" Focusable="False" HorizontalAlignment="Stretch"  VerticalAlignment="Stretch" />
    <Button Name="btn_temp2" Content="Button" Focusable="False" Grid.Column="1" HorizontalAlignment="Stretch"  VerticalAlignment="Stretch" />
    <Button Name="btn_temp3" Content="Button" Focusable="False" Grid.Column="2" HorizontalAlignment="Stretch"   VerticalAlignment="Stretch"  />
</Grid>

PreviewKeyDown += YourKeyEventHandler;


        <RowDefinition Height="1*"/>
        <RowDefinition Height="1*"/>
        <RowDefinition Height="1*"/>
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="1*"/>
        <ColumnDefinition Width="1*"/>
        <ColumnDefinition/>
    </Grid.ColumnDefinitions>

    <Button Name="btn2" Content="2" Focusable="False"  FontSize="26"  HorizontalAlignment="Stretch"   VerticalAlignment="Stretch" Grid.Column="1" Grid.Row=" 1" />
    <Button Name="btn1" Content="1" Focusable="False" FontSize="26" HorizontalAlignment="Stretch"   Grid.Row="1" VerticalAlignment="Stretch" BorderBrush="DarkGray"  BorderThickness="4,2,2,8"  />
    <Button Name="btn3" Content="3" Focusable="False" FontSize="26" Grid.Column="2" Foreground="White"  HorizontalAlignment="Stretch"   Grid.Row="1" VerticalAlignment="Stretch"  />
    <Button Name="btn4" Content="4" Focusable="False"  FontSize="26" HorizontalAlignment="Stretch"   Grid.Row="2" VerticalAlignment="Stretch"  />
    <Button Name="btn5" Content="5" Focusable="False" FontSize="26" Grid.Column="1" HorizontalAlignment="Stretch"   Grid.Row="2" VerticalAlignment="Stretch"  />
    <Button Name="btn6" Content="6" Focusable="False" FontSize="26" Grid.Column="2" HorizontalAlignment="Stretch"  Grid.Row="2" VerticalAlignment="Stretch"  />
    <Button Name="btn7" Content="7" Focusable="False" FontSize="26" HorizontalAlignment="Stretch"   Grid.Row="3" VerticalAlignment="Stretch"  />
    <Button Name="btn8" Content="8" Focusable="False" FontSize="26" Grid.Column="1" HorizontalAlignment="Stretch"  Grid.Row="3" VerticalAlignment="Stretch"  />
    <Button Name="btn9" Content="9" Focusable="False" FontSize="26" Grid.Column="2" HorizontalAlignment="Stretch"   Grid.Row="3" VerticalAlignment="Stretch"   />
    <Button Name="btn0" Content="0" Focusable="False" FontSize="26" HorizontalAlignment="Stretch"  Grid.Row="4" VerticalAlignment="Stretch"  />
    <Button Name="btn00" Content="00" Focusable="False" FontSize="26" Grid.Column="1" HorizontalAlignment="Stretch"   Grid.Row="4" VerticalAlignment="Stretch"  />
    <Button Name="btn_dot" Content="." Focusable="False" FontSize="26" Grid.Column="2" HorizontalAlignment="Stretch"   Grid.Row="4" VerticalAlignment="Stretch"  />
    <Button Name="btn_temp1" Content="Button" Focusable="False" HorizontalAlignment="Stretch"  VerticalAlignment="Stretch" />
    <Button Name="btn_temp2" Content="Button" Focusable="False" Grid.Column="1" HorizontalAlignment="Stretch"  VerticalAlignment="Stretch" />
    <Button Name="btn_temp3" Content="Button" Focusable="False" Grid.Column="2" HorizontalAlignment="Stretch"   VerticalAlignment="Stretch"  />
</Grid>

您可以从MSDN上的链接页面了解更多信息。
我无法完全理解。请详细告诉我。如何添加您所说的上述事件，如果您用VB告诉我，这对我也有帮助对不起，我不写visualbasic，您必须使用联机C#to VB转换器。至于细节，我真的不知道我还能说什么。。。只需将事件处理程序附加到您的
UserControl
，如我上面所示。如果您真的不知道如何附加事件处理程序，那么很抱歉，您不应该使用堆栈溢出，因为它假设用户对开发有一些基本的了解。好的，那么请告诉我什么是PreviewKeyDown+=YourKeyEventHandler它的含义以及我必须在哪里编写它。这只是将事件处理程序方法（
YourKeyEventHandler
）附加到事件（
PreviewKeyDown
）的简写符号.但我不知道如何让焦点控件添加在KeyEventHandler中按下的键
        <RowDefinition Height="1*"/>
        <RowDefinition Height="1*"/>
        <RowDefinition Height="1*"/>
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="1*"/>
        <ColumnDefinition Width="1*"/>
        <ColumnDefinition/>
    </Grid.ColumnDefinitions>

    <Button Name="btn2" Content="2" Focusable="False"  FontSize="26"  HorizontalAlignment="Stretch"   VerticalAlignment="Stretch" Grid.Column="1" Grid.Row=" 1" />
    <Button Name="btn1" Content="1" Focusable="False" FontSize="26" HorizontalAlignment="Stretch"   Grid.Row="1" VerticalAlignment="Stretch" BorderBrush="DarkGray"  BorderThickness="4,2,2,8"  />
    <Button Name="btn3" Content="3" Focusable="False" FontSize="26" Grid.Column="2" Foreground="White"  HorizontalAlignment="Stretch"   Grid.Row="1" VerticalAlignment="Stretch"  />
    <Button Name="btn4" Content="4" Focusable="False"  FontSize="26" HorizontalAlignment="Stretch"   Grid.Row="2" VerticalAlignment="Stretch"  />
    <Button Name="btn5" Content="5" Focusable="False" FontSize="26" Grid.Column="1" HorizontalAlignment="Stretch"   Grid.Row="2" VerticalAlignment="Stretch"  />
    <Button Name="btn6" Content="6" Focusable="False" FontSize="26" Grid.Column="2" HorizontalAlignment="Stretch"  Grid.Row="2" VerticalAlignment="Stretch"  />
    <Button Name="btn7" Content="7" Focusable="False" FontSize="26" HorizontalAlignment="Stretch"   Grid.Row="3" VerticalAlignment="Stretch"  />
    <Button Name="btn8" Content="8" Focusable="False" FontSize="26" Grid.Column="1" HorizontalAlignment="Stretch"  Grid.Row="3" VerticalAlignment="Stretch"  />
    <Button Name="btn9" Content="9" Focusable="False" FontSize="26" Grid.Column="2" HorizontalAlignment="Stretch"   Grid.Row="3" VerticalAlignment="Stretch"   />
    <Button Name="btn0" Content="0" Focusable="False" FontSize="26" HorizontalAlignment="Stretch"  Grid.Row="4" VerticalAlignment="Stretch"  />
    <Button Name="btn00" Content="00" Focusable="False" FontSize="26" Grid.Column="1" HorizontalAlignment="Stretch"   Grid.Row="4" VerticalAlignment="Stretch"  />
    <Button Name="btn_dot" Content="." Focusable="False" FontSize="26" Grid.Column="2" HorizontalAlignment="Stretch"   Grid.Row="4" VerticalAlignment="Stretch"  />
    <Button Name="btn_temp1" Content="Button" Focusable="False" HorizontalAlignment="Stretch"  VerticalAlignment="Stretch" />
    <Button Name="btn_temp2" Content="Button" Focusable="False" Grid.Column="1" HorizontalAlignment="Stretch"  VerticalAlignment="Stretch" />
    <Button Name="btn_temp3" Content="Button" Focusable="False" Grid.Column="2" HorizontalAlignment="Stretch"   VerticalAlignment="Stretch"  />
</Grid>