protected virtual void OnCellPaint(TableLayoutCellPaintEventArgs e)
{
TableLayoutCellPaintEventHandler eh = (TableLayoutCellPaintEventHandler)(Events [CellPaintEvent]);
if (eh != null)
{
eh(this, e);
}
}
/// <summary>
/// Extends BeginInvoke so that when a state object is not needed, null does not need to be passed.
/// <example>
/// tablelayoutcellpainteventhandler.BeginInvoke(sender, e, callback);
/// </example>
/// </summary>
public static IAsyncResult BeginInvoke(this TableLayoutCellPaintEventHandler tablelayoutcellpainteventhandler, Object sender, TableLayoutCellPaintEventArgs e, AsyncCallback callback)
{
if (tablelayoutcellpainteventhandler == null)
{
throw new ArgumentNullException("tablelayoutcellpainteventhandler");
}
return(tablelayoutcellpainteventhandler.BeginInvoke(sender, e, callback, null));
}
protected virtual void OnCellPaint(TableLayoutCellPaintEventArgs e)
{
TableLayoutCellPaintEventHandler handler = (TableLayoutCellPaintEventHandler)base.Events[EventCellPaint];
if (handler != null)
{
handler(this, e);
}
}
public void TableLayoutPanel_OnCellPaint_Invoke_Success()
{
var panel = new SubTableLayoutPanel();
// No handler.
panel.OnCellPaintEntry(null);
// Handler.
int callCount = 0;
TableLayoutCellPaintEventHandler handler = (sender, e) =>
{
Assert.Equal(panel, sender);
callCount++;
};
panel.CellPaint += handler;
panel.OnCellPaintEntry(null);
Assert.Equal(1, callCount);
// Should not call if the handler is removed.
panel.CellPaint -= handler;
panel.OnCellPaintEntry(null);
Assert.Equal(1, callCount);
}
