private void CancelAddNew()
{
if (this.isEditableObject)
{
((IEditableObjectEvents)this.newItemPending).Ended -= new EventHandler(editableListItem_Ended);
((IEditableObjectEvents)this.newItemPending).Cancelled -= new EventHandler(editableListItem_Cancelled);
}
ObjectView temp = this.newItemPending;
this.newItemPending = null;
this.Remove(temp.Object);
}
/// <summary>
/// Adds a new item to the list.
/// </summary>
/// <returns>The item added to the list (wrapped in an <see cref="ObjectView"/>).</returns>
/// <exception cref="T:System.Data.DataException"><see cref="P:System.ComponentModel.IBindingList.AllowNew"></see> is false. </exception>
public object AddNew()
{
Lock();
ObjectView wrapper = null;
try
{
if (!this.allowNew)
throw new DataException("AllowNew is set to false.");
AddingNewEventArgs args = new AddingNewEventArgs();
OnAddingNew(args);
object newItem = args.NewObject;
if (newItem == null)
{
if (this.itemType == null)
throw new InvalidOperationException("The list item type must be set first.");
newItem = Activator.CreateInstance(this.itemType);
}
else
{
if (this.ItemType == null)
this.ItemType = newItem.GetType();
else if (newItem.GetType() != this.ItemType)
throw new ArgumentException("Added item type is different from list item type.");
}
wrapper = new ObjectView(newItem);
// If an item was previously added with AddNew() but has not yet been committed with item.EndEdit(), commit it now.
if (newItemPending != null)
FinishAddNew();
this.newItemPending = wrapper;
// If the item type is IEditable object, a newly added item will be removed from the list if IEditableObject.CancelEdit is called before
// the next call to AddNew(). When IEditableObject.EndEdit() is called, ListChanged+ItemAdded is raised again for the same item.
if (this.isEditableObject)
{
((IEditableObjectEvents)this.newItemPending).Ended += new EventHandler(editableListItem_Ended);
((IEditableObjectEvents)this.newItemPending).Cancelled += new EventHandler(editableListItem_Cancelled);
}
this.Add(newItem);
}
finally
{
Unlock();
}
RaiseEvents();
return wrapper;
}
private void FinishAddNew()
{
if (this.isEditableObject)
{
((IEditableObjectEvents)this.newItemPending).Ended -= new EventHandler(editableListItem_Ended);
((IEditableObjectEvents)this.newItemPending).Cancelled -= new EventHandler(editableListItem_Cancelled);
}
// Raise the second ListItemChanged / ItemAdded event.
if (this.isEditableObject)
{
int index = this.IndexOf(this.newItemPending.Object);
this.QueueEvent(new ListChangedEventArgs(ListChangedType.ItemAdded, index));
}
this.newItemPending = null;
// Now that the item is committed, reposition it in the sort, and potentially filter it out of the list.
if (this.IsFiltered)
ApplyFilter();
if (this.IsSorted)
ApplySortCore();
}