Vb.net 文本框不允许按backspace键？

我制作了一个文本框，它将字符的使用限制为数字和句点。很好，但现在我不能输入backspace来修改文本框中键入的任何数据。我怎样才能解决这个问题

    Private Sub TextBox10_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox10.KeyPress

    Dim allowedChars As String = "1234567890."

    If allowedChars.IndexOf(e.KeyChar) = -1 Then
        ' Invalid Character
        e.Handled = True
    End If

End Sub

---

您可以使用

If e.KeyChar = ChrW(8) Then
    MessageBox.Show("backspace!")
End If

因此，您的整个代码将变成：

Private Sub TextBox10_KeyPress(ByVal sender As Object, ByVal e As     System.Windows.Forms.KeyPressEventArgs) Handles TextBox10.KeyPress

    Dim allowedChars As String = "1234567890."

    If allowedChars.IndexOf(e.KeyChar) = -1 andalso
            Not e.KeyChar = ChrW(8) Then
        ' Invalid Character
        e.Handled = True
    End If

End Sub

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