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Could not load ResourceTypes from Collection

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answered on 03 Mar 2011, 10:42 AM

Hello,

In the latest beta release the ResourceTypesSource is of type IEnumerable<IResourceType>. Since the source collection is List<ResourceType> (note this is not the interface), the binding decides that the types are different (and they really are) and sets value null. To workaround the problem, please, use List<IResourceType> instead. The same is for CategoriesSource and TimeMarkersSource.

In the official release thoes properties will be of type IEnumerable and you will be able to feed them with any IEnumerable, with any generic type parameter.

Best wishes,
Valeri Hristov
the Telerik team

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answered on 03 Mar 2011, 03:34 PM

Hello Jakkie,

ResourceTypeCollection works because it inherits from ObservableCollection<IResource>.

As far as I can see, we attach CollectionChanged handler on the ResourceTypesSource if it implements INotifyCollectionChanged, so if you add new resource types at runtime the control should update itself. However, it will not update if you add new resource in an existing in the collection resource type at runtime, which I suppose is your scenario. Could you please, provide more information about how do you build the data context, so we might fix the potential bug before the release?

Regards,
Valeri Hristov
the Telerik team

answered on 08 Mar 2011, 11:22 AM

Hi Jakkie,

We took some time to investigate the problem. I would suggest you to add the resource types after you load the resources. For example, the constructor should look like:

Copy Code

public ScheduleModel()

{

Resources = new ResourceTypeCollection();

LocationsResource = new ResourceType("Location");

LocationsResource.AllowMultipleSelection = false;

LocationsResource.DisplayName = LocalizationManager.GetString("_Location");

LotsResource = new ResourceType("Lot");

LotsResource.AllowMultipleSelection = false;

LotsResource.DisplayName = LocalizationManager.GetString("_Lots");

GroupDescriptions = new GroupDescriptionCollection();

ResourceGroupDescription locationGrp = new ResourceGroupDescription();

locationGrp.ResourceType = "Location";

locationGrp.ShowNullGroup = false;

//locationGrp.GroupNames.Add("");

GroupDescriptions.Add(locationGrp);

ResourceGroupDescription lotGrp = new ResourceGroupDescription();

lotGrp.ResourceType = "Lot";

lotGrp.ShowNullGroup = false;

GroupDescriptions.Add(lotGrp);

Appointments = new ObservableCollection<Allocation>();

}

..and the SetLocations method should look like:

Copy Code

public void SetLocations()

{

LocationsResource.Resources.Clear();

LotsResource.Resources.Clear();

Resources.Clear();

for (int i = 0; i < 4; i++)

{

Resource res = new Resource("Loc"+i, "Location");

LocationsResource.Resources.Add(res);

for (int j = 0; j < 3; j++ )

{

Resource lotRes = new Resource("Lot"+i+"-"+j, "Lot");

LotsResource.Resources.Add(lotRes);

}

Resources.Add(LocationsResource);

Resources.Add(LotsResource);

AddAppointments();

ValueChanged("Locations");

ValueChanged("Resources");

ValueChanged("LocationsResource");

ValueChanged("GroupDescriptions");

}

We will consider to change this behavior in our further development. Sorry for any inconvenience caused.

All the best,
George
the Telerik team