[WPF TextBox] When the context menu is displayed, the selected character string of TextBox is canceled.

Question

I have a question about WPF TextBox.
Right-clicking with a character selected in the TextBox opens a standard context menu.
However, if you right-click outside the selected string, the string will be deselected.
I don't want to clear the selected string when I open the context menu like the address bar in Explorer.
(Right-click on the selected string to open the context menu as desired.)

The same result was achieved by opening my own context menu within the TextBox.
Is there a good solution?

Answer 1

You can handle OnContextMenuOpening.
Something like :

public partial class MyTextBox : TextBox
{
    protected override void OnContextMenuOpening(ContextMenuEventArgs e)
    {
        int nSelStart = this.SelectionStart;
        int nSelLength = this.SelectionLength;
        base.OnContextMenuOpening(e);           
        this.Select(nSelStart, nSelLength);
    }
}  

Answer 2

You could try to add con.focusable = false; so that the string is still selected when you right-click to display the context menu.
The code of xaml:

<Grid>  
        <TextBox x:Name="myText" Height="38" Margin="0,72,6,0" VerticalAlignment="Top" HorizontalAlignment="Right" Width="135"></TextBox>  
        <Label Height="30" Margin="12,80,164,0" Name="label1" VerticalAlignment="Top">Textbox with contextMenu property set</Label>  
</Grid>  

The code of xaml.cs:

public partial class MainWindow : Window  
  {  
    ContextMenu con = new ContextMenu();  
    public MainWindow()  
    {   
      InitializeComponent();  
      MenuItem menuItem1 = new MenuItem();  
      menuItem1.Header = "Menu1";  
      MenuItem menuItem2 = new MenuItem();  
      menuItem2.Header = "Menu2";  
      con.Items.Add(menuItem1);  
      con.Items.Add(menuItem2);  
      con.Focusable = false;  
      this.myText.ContextMenu = con;  
    }  
  }  

The picture of result:

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