Problem with events
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In the following code I register for two events in the last two lines. The evnts fire for the first time the form is loaded but from the second time and on, events are not registered anymore. I tired different things like adding dataGrid.Scroll -= new ScrollEventHandler(dataGrid_Scroll); dataGrid.KeyPress -= new KeyPressEventHandler(dataGrid_KeyPress); beofre assigning dataGrid to the new FinderDataGridView object but stil doesn't work. I guess the question is what is the correct way of registering for events when you reassign an object to a new one? Hopefully the question is clear :~ public void SetFinder(ComplexObject finderObject) { complexObject = finderObject; view = complexObject[0].DefaultView; initialFilter = view.RowFilter; dataGrid = new FinderDataGridView(view, complexObject[0].QuickFinderColumns, complexObject); dataGrid.ColumnHeadersVisible = false; datagridSplit.Panel2.Controls.Add(dataGrid); emptyTable = new DataTable(); foreach (DataColumn column in finderObject.Tables[0].Columns) { if (column.ColumnMapping == MappingType.Element) { emptyTable.Columns.Add(new DataColumn(column.ColumnName, column.DataType)); } } emptyDataGrid.DataSource = emptyTable; emptyTable.Rows.Add(emptyTable.NewRow()); emptyTable.AcceptChanges(); dataGrid.Scroll += new ScrollEventHandler(dataGrid_Scroll); dataGrid.KeyPress += new KeyPressEventHandler(dataGrid_KeyPress); }
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In the following code I register for two events in the last two lines. The evnts fire for the first time the form is loaded but from the second time and on, events are not registered anymore. I tired different things like adding dataGrid.Scroll -= new ScrollEventHandler(dataGrid_Scroll); dataGrid.KeyPress -= new KeyPressEventHandler(dataGrid_KeyPress); beofre assigning dataGrid to the new FinderDataGridView object but stil doesn't work. I guess the question is what is the correct way of registering for events when you reassign an object to a new one? Hopefully the question is clear :~ public void SetFinder(ComplexObject finderObject) { complexObject = finderObject; view = complexObject[0].DefaultView; initialFilter = view.RowFilter; dataGrid = new FinderDataGridView(view, complexObject[0].QuickFinderColumns, complexObject); dataGrid.ColumnHeadersVisible = false; datagridSplit.Panel2.Controls.Add(dataGrid); emptyTable = new DataTable(); foreach (DataColumn column in finderObject.Tables[0].Columns) { if (column.ColumnMapping == MappingType.Element) { emptyTable.Columns.Add(new DataColumn(column.ColumnName, column.DataType)); } } emptyDataGrid.DataSource = emptyTable; emptyTable.Rows.Add(emptyTable.NewRow()); emptyTable.AcceptChanges(); dataGrid.Scroll += new ScrollEventHandler(dataGrid_Scroll); dataGrid.KeyPress += new KeyPressEventHandler(dataGrid_KeyPress); }
Hello,
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Johnny~ wrote:I tired different things like adding dataGrid.Scroll -= new ScrollEventHandler(dataGrid_Scroll); dataGrid.KeyPress -= new KeyPressEventHandler(dataGrid_KeyPress); beofre assigning dataGrid to the new FinderDataGridView object but stil doesn't work.
Although, it is not solving your problem, you should always unregister the event like this, bevor creating a new instance, cause the old instance will not be cleared by the GC. I think the problem could be that you are not removing the old dataGrid instance out of the datagridSplit.Panel2.Controls. If your dataGrid instance has a dispose method, you also should call it. Hope it helps! All the best, Martin