如何在没有 InvalidCastException 的情况下处理 TextBox 和 MaskTextBox 的事件？

Question

任何朋友请更正我的脚本，TextBox 变量工作完成但 MaskTextBox 在此 EnterEvent.

中返回 error

我想将 event-handling 的一个函数用于 TextBox 和 MaskTextBox

    Private Sub TextBox_Enter(sender As Object, e As EventArgs) Handles OrgNameTextBox.Enter, AddressTextBox.Enter, ContactNumMaskedTextBox.Enter
        Dim Tb As TextBox = CType(sender, TextBox)
        Dim Mtb As MaskedTextBox = CType(sender, MaskedTextBox)
        If Type = MASKTEXTBOX Then
            MTb.BackColor = Color.Yellow
            MTb.ForeColor = Color.Black
        ElseIf Type = TextBox Then
            Tb.BackColor = Color.Yellow
            Tb.ForeColor = Color.Black
        End If
    End Sub

Answer 1

事件处理程序无法工作，因为总是存在类型转换错误正确的版本是

Private Sub TextBox_Enter(sender As Object, e As EventArgs) Handles OrgNameTextBox.Enter, AddressTextBox.Enter, ContactNumMaskedTextBox.Enter
    If TypeOf sender Is MaskedTextBox Then
        Dim Mtb As MaskedTextBox = CType(sender, MaskedTextBox)
        Mtb.BackColor = Color.Yellow
        Mtb.ForeColor = Color.Black
    ElseIf TypeOf sender Is TextBox Then
        Dim Tb As TextBox = CType(sender, TextBox)
        Tb.BackColor = Color.Yellow
        Tb.ForeColor = Color.Black
    End If
End Sub

最好使用两个控件的共同祖先 TextBoxBase

Private Sub TextBox_Enter(sender As Object, e As EventArgs) Handles OrgNameTextBox.Enter, AddressTextBox.Enter, ContactNumMaskedTextBox.Enter
    Dim bt As TextBoxBase = TryCast(sender, TextBoxBase)
    If bt IsNot Nothing Then
        bt.BackColor = Color.Yellow
        bt.ForeColor = Color.Black
    End If
End Sub

Answer 2

我使用了@Jimi 的示例及其工作...

Private Sub MaskedTextBox_Enter(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles OrgNameTextBox.Enter, OrgNameTextBox.Leave        
    CType(sender, Control).BackColor = Color.Yellow
    CType(sender, Control).ForeColor = Color.Black
End Sub

如何在没有 InvalidCastException 的情况下处理 TextBox 和 MaskTextBox 的事件？

How to handle an event for TextBox and MaskTextBox without InvalidCastException?

vb.net

textbox

function

event-handling

maskedtextbox