literate for each loop my string in VB.Net-CodePudding

Dim txtLinqSum1Ad, txtLinqSum2Ad, txtLinqSum3Ad, txtLinqSum4Ad as String

instead of writing this thing

   TextBox1.AppendText(txtLinqSum1Ad & vbNewLine)
   TextBox1.AppendText(txtLinqSum2Ad & vbNewLine)
   TextBox1.AppendText(txtLinqSum3Ad & vbNewLine)
   TextBox1.AppendText(txtLinqSum4Ad & vbNewLine)

I would like to do something like that

For i as integer = 0 to 3

TextBox1.AppendText(txtLinqSum & i & Ad & vbNewLine)

Next

Do you think that could be possible? it would be useful when I have a lot of strings?

CodePudding user response：

Yes, it's possible with CallByName(), or via Reflection (much longer syntax).

For CallByName() to work, though, your variables have to be PUBLIC at Form/Class level:

Public Class Form1

    Public txtLinqSum1Ad, txtLinqSum2Ad, txtLinqSum3Ad, txtLinqSum4Ad As String

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        txtLinqSum1Ad = "A"
        txtLinqSum2Ad = "B"
        txtLinqSum3Ad = "C"
        txtLinqSum4Ad = "D"
    End Sub

    Private Sub butBereken_Click(sender As Object, e As EventArgs) Handles butBereken.Click
        For i As Integer = 1 To 4
            Dim s As String = CallByName(Me, "txtLinqSum" & i & "Ad", CallType.Get)
            TextBox1.AppendText(s & vbNewLine)
        Next
    End Sub

End Class

But just because you can, doesn't mean you should. An array or other type of collection (List/Dictionary) would probably be a better choice.