Trigger loading by hand

[Pawel]

Hello

Can I load some portion of data programmatically? For example:

class Work { public string WorkTitle { get; set; } }

var query = generateQueryFor<Work>.OrderBy(w => w.WorkTitle);
var virtualQuery = new VirtualQueryableCollectionView(query) { LoadSize = 50 };

virtualQuery.ItemsLoading += (sender1, eventArgs1) =>
{
    //event doesn't firing
};
virtualQuery.ItemsLoaded += (sender2, eventArgs2) =>
{
    //event doesn't firing
};

// how force to load some data?
// GetItemAt doesn't loads any data
var row0 = virtualQuery.GetItemAt(0);
var row1 = virtualQuery.GetItemAt(1);
var row2 = virtualQuery.GetItemAt(2);

[Dimitrina]

Hello,

Would you please try invoking ResetItems(int startIndex, int count) for the virtual collection?

Regards,
Dimitrina
Telerik

[Pawel]

ResetItems cause System.ArgumentOutOfRangeException with message "Index was out of range. Must be non-negative and less than the size of the collection.​".

 Stacktrace:

            w System.ThrowHelper.ThrowArgumentOutOfRangeException()
            w System.Collections.ObjectModel.Collection`1.set_Item(Int32 index, T value)
            w System.Collections.ObjectModel.Collection`1.System.Collections.IList.set_Item(Int32 index, Object value)
            w Telerik.Windows.Data.VirtualQueryableCollectionView.ResetItems(Int32 startIndex, Int32 count)

[Dimitrina]

Hi,

Have you set the virtual collection as a Source collection of an items control (for example RadGridView)? In case not, then you should do so. I am afraid it will not be possible to trigger loading otherwise. 

Regards,
Dimitrina
Telerik