Paging & Data Loading with RadGridView

[Scott]

Hey Telerik Team -

I've got a RadGridView & RadDataPager bound to a QueryableCollectionView in my ViewModel. In my service callback, I set my QCV to an ObservableCollection which is successfully returning ~1200 rows. My DataPager.PageSize is set to 20, and on page load, I can see "Page 1 of 61". My RGV however is empty. If I sort, group, filter, or page my data is displayed in my RGV, but not until I call any one of these.

<telerik:RadGridView x:Name="WOAGridView"
    ItemsSource="{Binding WorkOrders}"
    HorizontalAlignment="Left"
    AutoGenerateColumns="False"
    IsReadOnly="True" />
<telerik:RadDataPager Grid.Row="1" Source="{Binding WorkOrders}" PageSize="20"/>

Here's where I'm setting the WorkOrders:

private void GetWorkOrdersCallback(ObservableCollection<TSMVVM.Model.WorkOrders> workOrders)
       {
           if (workOrders != null)
           {
               if (workOrders.Count > 0)
               {
                   WorkOrders = new QueryableCollectionView(workOrders);
               }
           }
       }

In the setter of my WorkOrders property, I'm calling RaisePropertyChanged, as my ViewModels all implement INotify.

Any ideas?

[Vlad]

Hi,

 Unfortunately it will be impossible to tell you what's going on just by this code. Can you replace RadGridView temporary with ListBox to see what will be the result? 

Best wishes,
Vlad
the Telerik team

[Scott]

Sorry for the delay in getting back to you. Replacing my RadGridView with

<ListBox ItemsSource="{Binding Assemblies}"></ListBox>

Results in the records being displayed on page load. I can paginate these with no problem.

As soon as I removed "DataLoadMode=Asynchronous" it started working. I have that on 20 other RadGridViews in this app and it works no sweat. Not sure why that would cause the issue...

[Vlad]

Hi,

 Are you loading the data from a service in this scenario? If this is the case please remove Asynchronous DataLoadMode setting since the binding itself is asynchronous. 

Kind regards,
Vlad
the Telerik team