How do I open a file into a textbox with multiple tabs?

问题

I'm creating a document writing program in VB.NET, and I can create multiple tabs. How would I open a file into the textbox that I am open on, even though I can't declare what textbox I'm using? Link to understand this better

Code for the sub:

Public Sub setText(Byval value As String)
  If tabPage1.Visible = True Then
    mainText.Text = value
  ElseIf tabPage2.Visible = True Then
    textBox1.Text = value
  End If
End Sub

Thanks in advance!

回答1:

You need to use the same type of idea you did for the getText

Dim sub setText(value as string)
  Dim mytextbox As TextBox = TabControl1.SelectedTab.Controls.OfType(Of TextBox)().First()

  mytextbox.text = value
end sub 

来源：https://stackoverflow.com/questions/34244001/how-do-i-open-a-file-into-a-textbox-with-multiple-tabs