[Solved] QDSCV and Data Virtualization with WCF RIA Services

[Mathieu]

Hello,

we are using telerik's GridView and have a few questions:

• Are there any plans to support virtualization through the QDSCV instead of the VirtualQueryableCollectionView
• Is Grouping supported with virtualization, based on this demo, it does not seem to work properly(I do understand that it is demonstrating the sorting and filtering capabilities, but by showing the group panel the grouping seems to apply only to the currently loaded data)

[Rossen Hristov]

Hi Mathieu,

The VirtualQueryableCollectionView and the QueryableDomainServiceCollectionView are two different approaches to solving the same problem -- displaying only a part of the data.

They are alternatives, not complementaries, so the answer would be no.

You can't have server-side paging (QDSCV) and data virtualization (VQCV) at the same time. You have to choose either one or the other.

In case you want to use the VirtualQueryableCollectionView, please take a look at these blog posts:

Telerik Data Virtualization, WCF RIA Services and Visual Studio Async CTP
Server sorting and filtering with WCF RIA Services and Telerik Data Virtualization for Silverlight

In case you want to use the QueryableDomainServiceCollectionView, please take a look at this one:

An MVVM Approach to Telerik Domain Services for Silverlight

As per your second question, you are right. Grouping can only be performed on the currently loaded data. In fact, if you take a look at WCF RIA Services docs you will notice that WCF RIA Services does not support server-side grouping at all -- it simply sorts the data. Everything is done on the client, thus on the data that currently resides on the client.

I hope this helps.

Greetings,
Ross
the Telerik team