UPDATE single ROW from DATAGRID without refreshing the entire ItemsSource

Question

Hello there,
   I have a simple datagrid that has an ItemsSource of ObjectQuery<DbDataRecord>.
   Let's say I want to refresh a single row from the datagrid, (Because a specific item i know has been changed) without refreshing the entire ItemsSource because the source query is quite big.
Any ideas?
Thanks.
-- Jorge_M_P

Answer 1

Whilst you could raise property changed on every field in an item, that would of course mean implementing inotifypropertychanged on a wrapper object, then iterating all of those properties.
An observablecollection implements the INotifyCollectionChanged interface.
Amongst the possibilities for changes which that notifies are this one:
https://msdn.microsoft.com/en-us/library/ms653207(v=vs.110).aspx
Which notifies of a single item change.
I usually wrap my entity framework objects.
Sometimes I wrap all the properties so I can do change tracking in the viewmodel.
This is a technique similar to the one I use in this sample:
https://gallery.technet.microsoft.com/WPF-Highlight-Changed-a77976d4
Which wraps plain classes - but the principle is the same.
And
I wrap the object and expose that, as I do in this:
http://social.technet.microsoft.com/wiki/contents/articles/28209.wpf-entity-framework-mvvm-walk-through-1.aspx
Note that because I wrap the same objects returned from EF, there is very little overhead in using an observable collection there.
Hope that helps.
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