如何在vb.net wpf的文本框中禁用退格？ [英] how to disable backspace in a textbox in vb.net wpf?

问题描述

如何在vb.net wpf的文本框中禁用退格键？





我已经尝试了

 私人  Sub  TextBox1_KeyDown（ ByVal  sender 作为系统。对象， ByVal  e  As  System.Windows.Forms.KeyEventArgs）句柄 TextBox1.KeyDown 
 如果 e.KeyCode = Keys.Back 或 e.KeyCode = Keys.Delete 然后 
 e.SuppressKeyPress =  True  
 结束 如果 
 结束  Sub  
 

但它在WPF中不起作用。我不知道为什么。

解决方案

参考 - 按键WPF中的事件 [ ^ ]。



代码在C＃中，但你可以使用相同的逻辑。

用于此用途

 私人 < span class =code-keyword> Sub  TextBox1_PreviewKeyDown（sender  As   Object ，e < span class =code-keyword> As  System.Windows.Input.KeyEventArgs）句柄 TextBox1.PreviewKeyDown 
 如果 e.Key = Key.Back 那么 
 e.Handled =  True  
 结束 如果 

< br $>




还看看

http://msdn.microsoft.com/en-us/library/system.windows.forms.control.previewkeydown.aspx [ ^

how to disable backspace in a textbox in vb.net wpf?


I've already tried

Private Sub TextBox1_KeyDown(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles TextBox1.KeyDown
       If e.KeyCode = Keys.Back Or e.KeyCode = Keys.Delete Then
           e.SuppressKeyPress = True
       End If
   End Sub

but it doesn't work in WPF. I dont know why.

解决方案

Refer - Key press event in WPF[^].

The code is in C#, but you can use the same logic.

For this use

Private Sub TextBox1_PreviewKeyDown(sender As Object, e As System.Windows.Input.KeyEventArgs) Handles TextBox1.PreviewKeyDown
       If e.Key = Key.Back Then
           e.Handled = True
       End If

Also have a look at
http://msdn.microsoft.com/en-us/library/system.windows.forms.control.previewkeydown.aspx[^]

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