I'm writing a custom ItemsControl
(a tabbed document container), where each item (tab) can remove itself from the UI when the user closes it. However, I can't remove it directly from the ItemsControl.Items
collection, because the items can be databound. So I have to remove it from the ItemsSource
, which can be anything (ICollection
, DataTable
, DataSourceProvider
...).
In the context of my application, I know what the actual type of the ItemsSource
will be, but I want that control to be more generic so that I can reuse it later.
So I'm looking for a way to remove an item from a data source, without knowing its type. I could use reflection, but it feels dirty... So far the best solution I came up with is using dynamic
:
internal void CloseTab(TabDocumentContainerItem tabDocumentContainerItem)
{
// TODO prompt user for confirmation (CancelEventHandler ?)
var item = ItemContainerGenerator.ItemFromContainer(tabDocumentContainerItem);
// TODO find a better way...
try
{
dynamic items = ItemsSource;
dynamic it = item;
items.Remove(it);
}
catch(RuntimeBinderException ex)
{
Trace.TraceError("Oops... " + ex.ToString());
}
}
But I'm not really happy with it, I'm sure there must be a better way. Any suggestions would be appreciated !
The ItemCollection
returned by ItemsControl.Items
won't allow you to call Remove directly, but it implements IEditableCollectionView
and does allow you to call the Remove method in that interface.
This will only work if the collection view bound to ItemsSource
implements IEditableCollectionView
itself. The default collection view will for most mutable collections, although not for objects that implement ICollection
but not IList
.
IEditableCollectionView items = tabControl.Items; //Cast to interface
if (items.CanRemove)
{
items.Remove(tabControl.SelectedItem);
}