How to get the highest parent(The form in which the user control is located) of an object(user control)

Question

When I want to reach the highest parent(meaning the same form) in my fake user control , these are returned due to the placement of the user control in (TableLayoutPanel, Panel, TabControl,...).

Answer 1

Hi @Mansour_Dalir ,

You can recursively traverse the parent hierarchy until you find a form.

Public Module UserControlExtensions
    <Runtime.CompilerServices.Extension()>
    Public Function GetTopLevelForm(control As Control) As Form
        Dim parentForm As Form = TryCast(control, Form)

        While parentForm Is Nothing AndAlso control IsNot Nothing
            control = control.Parent
            parentForm = TryCast(control, Form)
        End While

        Return parentForm
    End Function
End Module

Then use this extension method on your UserControl instances like this:

Dim topLevelForm As Form = UserControlExtensions.GetTopLevelForm(Me)

Best Regards.

Jiachen Li

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