DevForce Community Forum : EntityQueryPagedCollectionView

EntityQueryPagedCollectionView : Awesome, this works great. I do...

Thu, 30 Dec 2010 06:41:36 -700

Author: gregweb
Subject: 2400
Posted: 30-Dec-2010 at 6:41am

Awesome, this works great. I do so much appreciate the support - I might not have ever figured that one out on my own.

Greg

EntityQueryPagedCollectionView : Hi Greg, When you call AddNew(),...

Wed, 29 Dec 2010 10:44:57 -700

Author: sbelini
Subject: 2400
Posted: 29-Dec-2010 at 10:44am

Hi Greg,

When you call AddNew(), a new instance is created using EM.CreatEntity and it goes into "Edit" mode (you probably want to add data to the new entity).

That's intentional - you can't page while an edit is underway.

Once you are done editting the entity, you must call CommitNew() (or CancelNew() if you want to dispose the entity) and then you can navigate/add items to the list.

The same happens if you are editing an existing item (i.e. this.Contacts.EditItem(this.Contacts.CurrentItem)) where you will need to call CommitEdit() or CancelEdit().

Silvio.

EntityQueryPagedCollectionView : I put together a small app based...

Sat, 25 Dec 2010 18:35:57 -700

Author: gregweb
Subject: 2400
Posted: 25-Dec-2010 at 6:35pm

I put together a small app based on the sample using an EntityQueryPagedCollectionView. It all works fine. Now, I would like to add an item to the list.

I use EntityQueryPagedCollectionView.Add() to add the item to the list, and it does add it to the list correctly. And I can also save it correctly. However, after the item is added, the list then locks up. It can no longer be paged, nor sorted, nor can more than one item be added. Any idea what is going on with this?

The code looks like this:

public void LoadContacts()
		{
                           var query = _mgr.ContactEntities;
 
			this.Contacts = new EntityQueryPagedCollectionView(
				query,
				this.PageSize,
				this.PageSize,
				true,
				false
				);
 
			this.Contacts.SortDescriptions.Add(new SortDescription("Last", ListSortDirection.Descending));
			this.Contacts.Refresh();
 
		}

internal void AddContact()
		{
			this.Contacts.AddNew();
		}

internal void SaveContact()
		{
			EntitySaveOperation op = this._mgr.SaveChangesAsync();
			op.Completed += new EventHandler<EntitySavedEventArgs>(op_Completed);
            
		}
 
		void op_Completed(object sender, EntitySavedEventArgs e)
		{
			EntitySaveOperation op = sender as EntitySaveOperation;
			if (op.HasError)
			{
				MessageBox.Show(op.Error.Message);
			}
            this.Contacts.Refresh();
		}