VB.Net UserControl Closing Event in Winforms

Question

I'm trying to save some layouts from DevExpress Grid Controls so that users can change the layouts and reload them in at a later use of the control.

My question is this for speed issues I am loading the control via a user control inside of a form. Now my problem is I am creating the control by adding an instance of the control to a panel control inside of a tabbed group control when the tab is made visible and then clearing the control when the control is hidden.

    If ClaimsGridPanelControl.Visible = True Then
            ClaimsGridPanelControl.Controls.Add(New RXClaimsGridControl(ClaimsBindingSource))
    Else
            ClaimsGridPanelControl.Controls.Clear()
    End If

So inside of the RxClaimGridControl I need to call a SaveLayout method when I am clearing the control. But there is no event, at least that I can find, that triggers when a usercontrol is removed/closed/hidden.

My thoughts for handling the .Clear() would be to raise an event in the parent control and then to handle that event inside of the user control.

Is there some event that I am missing in regards to the removal/closing/hiding of a user control, or is there a better way to do this.

Answer 1

Override the Dispose or OnHandleDestroyed methods of the UserControl.

Answer 2

I believe you are calling the SaveLayout() from the wrong place. Layout should only be saved when changes are made to the DXGrid itself and has nothing to do with the panel.

You can achive that by handling the

GridView_ShowCustomizationForm

Sample code

  Private Sub GridView_ShowCustomizationForm(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles GridView.ShowCustomizationForm
    Dim gView As DevExpress.XtraGrid.Views.Grid.GridView = CType(sender, DevExpress.XtraGrid.Views.Grid.GridView)
    AddHandler gView.CustomizationForm.FormClosing, AddressOf SaveGridSettings
End Sub

Private Sub SaveGridSettings()

 Grid.MainView.SaveLayoutToXml("c:\Settings.xml")

End Sub