DataGrid Sorting retention on ItemsSource Changed

I am using an MVVM approach.

I have a ViewModel and View called AllSomethingViewModel and AllSomethingView. The View Model contains a list of SomethingViewModels and a SelectedViewModel. The View contains a usercontol bound to the AllSomethingViewModel's SelectedVM property and a listbox control that lets me select a VM. Basically when I pick a new VM the usercontrol's DataContext changes and so the view associated with SomethingViewModel updates with new i开发者_如何转开发nformation.

SomethingViewModel contains a list of objects called ObservableCollection(DataPoints) data.

I have a DataGrid bound to data and columns defined that are bound to data's members. This works fine. I can change views and this datagrid updates and everything is nice.

The issue I am running into is that I would like whatever sorting is applyed to the datagrid to persist when the datacontext changes.

On the View associated with SomethingViewModel, I can subscribe to DataContextChanged event but I'm not sure what To do from there to get the sorting to apply.

For Example. I have 2 SomethingViewModels. So in my list there are 2 options. When i pick the first one I get my datagrid with my data. In the datagrid I decide to sort by DateCreated Ascending order. Then I go to my second VM, the datacontext changes so the data in the grid is updated but it is no longer sorted!

If your sorting is done by the DataGrid then it is stored in the ICollectionView that the DataGrid uses to display its data.

ICollectionView view = CollectionViewSource.GetDefaultView(myDataGrid.ItemsSource);
// Sorting is found in view.SortDescriptions

There's an example of setting your sorting in code here. Hope that's enough to get you going in the right direction