VB。 net，在文本框中输入

Question

当他/她输入错误输入整数系列时，我无法使用键盘中的Backspace按钮更改或编辑用户输入的内容...请帮帮我...

Private Sub tbx3_KeyPress(sender As Object, e As KeyPressEventArgs) Handles tbx3.KeyPress
    If CInt(Val(e.KeyChar)) = 8 Then
        Return
    End If
    Dim allowedchar As String = "1234567890"
    If Not (allowedchar.Contains(e.KeyChar)) Then
        e.KeyChar = CChar(e.KeyChar)

        e.Handled = True
    End If

End Sub

Answer 1

试试这个

 If (Microsoft.VisualBasic.Asc(e.KeyChar) < 48) _
          Or (Microsoft.VisualBasic.Asc(e.KeyChar) > 57) Then
        e.Handled = True
End If
If (Microsoft.VisualBasic.Asc(e.KeyChar) = 8) Then
        e.Handled = False
End If