Hi

I am having some problems with my custom entity collection and binding it.

I have called an entitycollection in the normal way but to save going back and for to the database as it is done by webservices I want to filter it locally.

Here's my code for creating the collection: Main elements is the one called directly from the DB

EntityCollection FilteredElements = new EntityCollection();
 IPredicateExpression Filter = new PredicateExpression(ElementFields.GroupID == Id);
List<int> ElementsIndexes = MainElements.FindMatches(Filter);
 foreach (int index in ElementsIndexes )
            {
                FilteredElements.Add((ElementEntity)MainElements[index]);
            }

I am then binding it to a Win forms RadComboBox by doing the following:

 DropDown.DisplayMember =ElementFields.Name.Name;
           BindingTypeDropDown.DropDown.ValueMember =ElementFields.Value.Name;
           BindingTypeDropDown.DropDown.DataSource = FilteredElements;

The problem is when I bind it to my dropdown all I get is a repeated list of "EntityClasses.ElementEntity"

If I put the MainElements entitycollection as the datasource it all works ok.

What am I doing wrong? I have been pulling my hair out all afternoon!

Thanks

Bex

Does it help if you set the DataSource first, and then the DisplayMember and ValueMember properties afterwards ?

Where does ElementFields come from...? and are you sure the values in it are case sensitive matches for your property names ?

Matt

Hi Matt

Telerik Says you need to set the data source afterwards to speed it up, but I have tried both ways round and botht have the same results.

Element fields comes from the main elements table (sorry mistyped when I copied it across).

I have tried typing "value" and "name" as the displaymemember rather than using elementfields.Value.Name etc but made no difference.

Thanks

Becky

What happens if you repeat these steps with the defacto combobox?

Also why don't you try using a bindingSource control as your middle guy?

Hi Walaa

It does the same with the normal combobox aswell and when using the bindingsource variable, and it still works with the original entitycollection..

I now have my boss on my back telling me to hurry up so I have resorted for the time being to looping the newly created entity collection like so:

  foreach (ElementEntity elementEntity in ElementCollection)
            {
                RadComboBoxItem item = new RadComboBoxItem(elementEntity.Name, elementEntity.Value);
                combo.Items.Add(item);
            }

I really would like to know why I cannot bind it in the usual way though!

Thanks bex

Are you using Adapter or SelfServicing?

EntityCollection FilteredElements = new EntityCollection();

Most probably because you are using an un-typed entityCollection, no entityFactory or type specified.

Also, why don't you use an entityView like so:

EntityView FilteredElements = new EntityView(MainElements);

IPredicateExpression Filter = new PredicateExpression(ElementFields.GroupID == Id);
customerView.Filter = Filter;

DropDown.DisplayMember =ElementFields.Name.Name;
BindingTypeDropDown.DropDown.ValueMember =ElementFields.Value.Name;
BindingTypeDropDown.DropDown.DataSource = FilteredElements; 

Hi Walaa

Thanks for the very quick replies..

I am using adapter and its version 2.6 (sept 12th 2008 ) ..

I tried setting the type of the entitycollection with the new EntityFactory but it also made no difference..

I did not know you could use an entityview for this, athough when I type "EntityView myView.." I get a red squiggle under "EntityView" saying

incorrect number of paramenters in reference class 'SD.LLBLGen.Prd.ORMSupportClasses.EntityView<TEntity>'

Do I need a different reference? Or do I just need to read up on it?

Thanks

Bex

For Adapter you should use this:

EntityView<MainEntity> FilteredElements = new EntityView<MainEntity>(MainElements);

Another example for clarification:

EntityView<CustomerEntity> customerView = new EntityView<CustomerEntity>(customers);

Thanks Walaa.

I shall try using the EntityView this afternoon and see how it goes!