Silverlight 4 Datagrid Sorting

Question

I'm having a heck of a time trying to get a silverlight datagrid to properly sort, and do so quickly (sub 1/10 second). Here's the scenario:

-WCF callback every 1/5 of a second -Take the callback, match up to the existing record in an ObservableCollection -Update the ObservableCollection's properties -Bind the grid.

I've tried a linq query, PagedCollectionView, and observablecollection.select(), all are waaaaaaay too slow, and introduce 12+ second delays in processing. Anyone else experience this?

Answer 1

Use PagedCollectionView, but only set it once. Create one view at application startup and then in your WCF callback update the objects instead of creating new ones. Then call Refresh() on your CollectionView.

Answer 2

Calling PagedCollectionView.Refresh from a separate timer works. This prevents the Refresh call from getting called every 1/10 of a second (which is the frequency of callbacks in my scenario).