仅在文本框中输入数字 [英] input number only in a textbox

问题描述

如何仅在文本框中输入数字?如果我按Backspace键或Delete键，还可以删除字符吗?我在Internet上尝试了一些代码，但是如果按退格键或Delete键，它并不会删除字符.

您能给我一些代码吗?

How to input number only in a text box? And also can remove a character if I press the backspace key or delete key? I tried some code in the internet but it didn''t remove a character if I press the backspace or delete key.

can you give me some code...

推荐答案

尝试一下:

Try this:

Private Sub NumberValidation(sender As Object, e As KeyPressEventArgs)
    If (e.KeyChar >= 48 AndAlso e.KeyChar <= 57) OrElse e.KeyChar = 8 Then
        e.Handled = False
    Else
        e.Handled = True
    End If
End Sub

您应该自己写自定义文本框类，如此处的链接:
http://www.daniweb.com/software-development/vbnet/code/353389/numberbox-textbox-that-takes-only-number-input [

You should write you own custom textbox class, as in the link here:
http://www.daniweb.com/software-development/vbnet/code/353389/numberbox-textbox-that-takes-only-number-input[^]
This allows handling the keypress event and filtering out any character that is unwanted. For the delete and backspace key: They are normally working in textboxes without any added code.

If Asc(e.KeyChar) >= 48 And Asc(e.KeyChar) <= 57 Or Asc(e.KeyChar) = 8 Then
            e.Handled = False
        Else
            e.Handled = True
        End If

我尝试了这段代码，它可以正常工作.

感谢所有人.

I tried this code and it works.

thanks to all.

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