当单击wpf中的RepeatButton时，如何调整文本框中的光标？

Question

 <Grid x:Name="BackSpaceButton">       
    <TextBox x:Name="txt_remove" Height="46" Margin="234,119,225,0" TextWrapping="Wrap" VerticalAlignment="Top" GotFocus="txt_remove_GotFocus" TabIndex="2"/>        
    <RepeatButton x:Name="rbtn_remove" Content="Backspace" Delay="400" Interval="200" Margin="415,124,0,0" RenderTransformOrigin="0.667,0.854" Click="rbtn_remove_Click" LostMouseCapture="rbtn_remove_LostMouseCapture" HorizontalAlignment="Left" Height="41" VerticalAlignment="Top" Width="66" TabIndex="2" />        
</Grid>

这个设计如下所示

​

​

public partial class Repeate : Window
{
    Control GetTextbox;
    TextBox GetInstance;
    public Repeate()
    {
        this.InitializeComponent();
    }

    private void rbtn_remove_Click(object sender, RoutedEventArgs e)
    {

        GetInstance = GetTextbox as TextBox;
        if (GetTextbox != null)
        {

            string _CurrentValue = GetInstance.Text;
            var _CareIndex = GetInstance.CaretIndex;

            if (_CareIndex > 0)
            {
                string _Backspace = _CurrentValue.Remove(_CareIndex - 1, 1);
                GetInstance.Text = _Backspace;                   
                GetInstance.CaretIndex = _CareIndex - 1;
            }
        }
    }

    private void txt_remove_GotFocus(object sender, RoutedEventArgs e)
    {
        GetTextbox = (Control)sender;
    }

    private void rbtn_remove_LostMouseCapture(object sender, MouseEventArgs e)
    {
        GetInstance.Focus();
    }


}

输出如下所示

​

​

当我单击Backspace按钮时，textbox将被移除，光标将在textbox.What中聚焦，问题是，当我单击并按住Backspace按钮时，textbox值会反复移除，但光标不会显示。

对于Ex:，在文本框中输入值，然后单击并按住系统键盘上的backspace键，然后收取差额。

Answer 1

使用下面的代码，它将帮助您well.why，因为有一天，我面临同样的问题。

<Grid x:Name="BackSpaceButton">
    <TextBox x:Name="txt_remove" Height="46" Margin="234,119,225,0" TextWrapping="Wrap" VerticalAlignment="Top" GotFocus="txt_remove_GotFocus" TabIndex="2"/>        
    <RepeatButton x:Name="rbtn_remove" Focusable="False"  Content="Backspace" Delay="400" Interval="100" Margin="415,123,0,0" RenderTransformOrigin="0.667,0.854" Click="rbtn_remove_Click" LostMouseCapture="rbtn_remove_LostMouseCapture" HorizontalAlignment="Left" Height="41" VerticalAlignment="Top" Width="66"/>        
</Grid>

在上面的代码中，我只添加了一个属性Focusable="False"

 private void rbtn_remove_Click(object sender, RoutedEventArgs e)
    {
        GetInstance = GetTextbox as TextBox;
        if (GetTextbox != null)
        {

            string _CurrentValue = GetInstance.Text;
            var _CareIndex = GetInstance.CaretIndex;

            if (_CareIndex > 0)
            {
                string _Backspace = _CurrentValue.Remove(_CareIndex - 1, 1);
                GetInstance.Text = _Backspace;                   
                GetInstance.Focus();
                GetInstance.CaretIndex = _CareIndex - 1;                   

            }
        }
    }
    void txt_remove_GotFocus(object sender, RoutedEventArgs e)
    {
        GetTextbox = (Control)sender;  
    }
    private void rbtn_remove_LostMouseCapture(object sender, MouseEventArgs e)
    {
        GetInstance.Focus();
    }

在上面的代码中，我刚刚添加了一个代码GetInstance.Focus();