在显示文本之前，在VB.net中对文本输入执行代码

Question

我在VB6中有这个代码：

Private Sub t_Change(Index As Integer)
Iznos = 0
For i = 1 To 4
    Iznos = Iznos + t(i).Text
Next
If CDbl(Iznos) > Label13.Caption Then
    t(Index).Text = 0
    Iznos = 0
    t(Index).SelStart = 0
    t(Index).SelLength = 1
    For i = 1 To 4
        Iznos = Iznos + t(i).Text
    Next
End If
t(0).Text = Format(Label13.Caption - CDbl(Iznos), "#,##0.00")
End Sub

这段代码适用于我的textboxes（其中4个名为：t(0),t(1),t(2),t(3)）。我试图用VB.net实现相同，但我似乎无法绕过它。这是我在VB.Net中的代码：

 Public Function izracunaj(ByVal s As Object)
    Dim ukupniIznos As Decimal = Decimal.Parse(maticnavalutatbox.Text)
    Dim poslaniIznos As Decimal = Decimal.Parse(s.text)
    Dim iznos As Decimal
    Dim allTextboxesPayment() As TextBox = {gotovinaTbox, karticeTbox, ostaloTbox, ziralnoTbox}
    For Each kontrola As TextBox In allTextboxesPayment
        iznos = iznos + Decimal.Parse(kontrola.Text)
    Next
    If CDbl(iznos) > ukupniIznos Then
        s.Text = 0
        iznos = 0
        For Each kontrola As TextBox In allTextboxesPayment
            iznos = iznos + Decimal.Parse(kontrola.Text)
        Next
    End If
    gotovinaTbox.Text = Format(ukupniIznos - CDbl(iznos), "#,##0.00")
End Function

但如果我这样调用我的函数：

Private Sub ziralnoTbox_TextChanged(sender As Object, e As TextChangedEventArgs) Handles ziralnoTbox.TextChanged
izracunaj(sender)
End Sub

它不起作用，因为我的izracunaj函数已经具有ziralnoTbox的输入值。如何在vb.net中实现与vb6相同的功能

Answer 1

如果我正确地看待这个，你可以利用TextChanged事件。

Private Sub TextBox1_TextChanged(sender As Object,
                                     e As EventArgs) Handles gotovinaTbox.TextChanged,
                                                            karticeTbox.TextChanged, 
                                                            ostaloTbox.TextChanged,
                                                            ziralnoTbox.TextChanged
    Dim ukupniIznos As Decimal = Decimal.Parse(maticnavalutatbox.Text)
    Dim poslaniIznos As Decimal = Decimal.Parse(s.text)
    Dim iznos As Decimal
    Dim allTextboxesPayment() As TextBox = {gotovinaTbox, karticeTbox, ostaloTbox, ziralnoTbox}
       'gotovinaTbox, quita esto?
    For Each kontrola As TextBox In allTextboxesPayment
        iznos = iznos + Decimal.Parse(kontrola.Text)
    Next
    If CDbl(iznos) > ukupniIznos Then
        s.Text = 0
        iznos = 0
        For Each kontrola As TextBox In allTextboxesPayment
            iznos = iznos + Decimal.Parse(kontrola.Text)
        Next
    End If
    gotovinaTbox.Text = Format(ukupniIznos - CDbl(iznos), "#,##0.00")
End Sub