VB.Net檢查標點符號

Question

我有一個按鍵事件，將輸入限制為只有這樣的數字：

Private Sub txtWeight_KeyPress(sender As Object, e As KeyPressEventArgs) Handles txtWeight.KeyPress

    If Not Char.IsNumber(e.KeyChar) Then
        e.Handled = True
    End If

End Sub

但我也想添加輸入句點的可能性，所以我嘗試將代碼更改為：

Private Sub txtWeight_KeyPress(sender As Object, e As KeyPressEventArgs) Handles txtWeight.KeyPress

    If Not Char.IsNumber(e.KeyChar) AndAlso Not Char.IsPunctuation(e.KeyChar) Then
        e.Handled = True
    End If

End Sub

但正如您所知，該程序允許我輸入每個標點符號，我想將其限制為僅“。” 我如何檢查正在輸入的標點符號？

Answer 1

e.Handled = e.KeyChar <> "."c AndAlso Not Char.IsNumber(e.KeyChar)