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I wrote some code to capture the user's selected values before changing them. Thus, allowing the changes to be restored to the previous values.
The problem I ran into was that my click event from the contextmenu is called multiple times. This wipes out the true previous values. I could just add a flag at the beginning of the event, but I was wondering if there was a better way to approach this? why is this click event called multiple times on a single click?
01.Private Sub FF_MenuItem_Click(sender As Object, e As EventArgs) Handles FF_MenuItem.Click02.'Populate selected cells with "FF"03.Try04.Dim cell As GridViewCellInfo05. 06.If dgvMain.SelectedCells.Count > 0 Then07._lastGridChange.Clear08.End If09. 10.For Each cell In dgvMain.SelectedCells11._lastGridChange.Add(cell.RowInfo.Index & "," & cell.ColumnInfo.Index & "," & cell.Value)12.cell.Value = "FF"13.Next14.Catch ex As Exception15.ShowErrorBox("No cell selection detected. Be sure to select a cell first.")16.End Try17.End SubLine 11. _lastGridChange saves the values before they are updated
01.Private Sub dgvMain_ContextMenuOpening(sender As Object, e As ContextMenuOpeningEventArgs) Handles dgvMain.ContextMenuOpening02. 03. FF_MenuItem.Text = "FF"04. HH_MenuItem.Text = "HH"05. CC_MenuItem.Text = "CC"06. ClearColumn_MenuItem.Text = "Clear Column Values"07. 08. Dim separator As RadMenuSeparatorItem = New RadMenuSeparatorItem()09. e.ContextMenu.Items.Add(separator)10. 11. Try12. e.ContextMenu.Items.Add(FF_MenuItem)13. e.ContextMenu.Items.Add(HH_MenuItem)14. e.ContextMenu.Items.Add(CC_MenuItem)15. e.ContextMenu.Items.Add(ClearColumn_MenuItem)16. Catch ex As Exception17. End Try18. 19. Try20. AddHandler FF_MenuItem.Click, AddressOf FF_MenuItem_Click21. AddHandler HH_MenuItem.Click, AddressOf HH_MenuItem_Click22. AddHandler CC_MenuItem.Click, AddressOf CC_MenuItem_Click23. AddHandler ClearColumn_MenuItem.Click, AddressOf ClearColumn_MenuItem_Click24. Catch ex As Exception25. End Try26.End SubSetting up the ContextMenu Options
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From original post: "...I could just add a flag at the beginning of the event,..."
> Actually, I'm stumped. Flag won't work here. I can't find a way to make this work. Any suggestions would be appreciated.
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I found a way to get the flag to work. I was looking for a way to clear the flag at the appropriate time. The grid_click event did the job.
I'm still curious why there a multiple calls to the MenuItem click event on a single click.
Also, was wondering if there was a better way to undo the last change other than the way I came up with.
According to the provided code snippet, it seems that you initialize the RadMenuItems outside the ContextMenuOpening event. However, you subscribe to the Click event of each item every time the ContextMenuOpening event is fired. In order to avoid multiple firing of the event, please ensure that you first unsubscribe from this event:
Dim FF_MenuItem As New RadMenuItemDim HH_MenuItem As New RadMenuItemDim CC_MenuItem As New RadMenuItemDim ClearColumn_MenuItem As New RadMenuItemPrivate Sub dgvMain_ContextMenuOpening(sender As Object, e As ContextMenuOpeningEventArgs) Handles RadGridView1.ContextMenuOpening FF_MenuItem.Text = "FF" HH_MenuItem.Text = "HH" CC_MenuItem.Text = "CC" ClearColumn_MenuItem.Text = "Clear Column Values" Dim separator As RadMenuSeparatorItem = New RadMenuSeparatorItem() e.ContextMenu.Items.Add(separator) Try e.ContextMenu.Items.Add(FF_MenuItem) e.ContextMenu.Items.Add(HH_MenuItem) e.ContextMenu.Items.Add(CC_MenuItem) e.ContextMenu.Items.Add(ClearColumn_MenuItem) Catch ex As Exception End Try Try RemoveHandler FF_MenuItem.Click, AddressOf FF_MenuItem_Click RemoveHandler HH_MenuItem.Click, AddressOf HH_MenuItem_Click RemoveHandler CC_MenuItem.Click, AddressOf CC_MenuItem_Click RemoveHandler ClearColumn_MenuItem.Click, AddressOf ClearColumn_MenuItem_Click AddHandler FF_MenuItem.Click, AddressOf FF_MenuItem_Click AddHandler HH_MenuItem.Click, AddressOf HH_MenuItem_Click AddHandler CC_MenuItem.Click, AddressOf CC_MenuItem_Click AddHandler ClearColumn_MenuItem.Click, AddressOf ClearColumn_MenuItem_Click Catch ex As Exception End TryEnd SubI hope this information helps. If you need any further assistance please don't hesitate to contact me.
Regards,
Dess | Tech Support Engineer, Sr.
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