My CollectionViewSource is not picking up changes

Question

I have a ListView which I'm binding to a CollectionViewSource in code behind with: ``` collectionView = CollectionViewSource.GetDefaultView(TableView.ItemsSource); collectionView.SortDescriptions.Clear(); collectionView.SortDescriptions.Add(new SortDescription(propertyName, direction)); ``` The TableView is the ListView, the propertyName is the name of the column I want sorted, and direction is either ascending or descending. The XAML has the following for ItemSource: ``` ItemsSource="{Binding Rows}" ``` The code behind has the following for the Rows: ``` List rows; public List Rows { get { return rows; } set { rows = value; UpdateProperty("Rows"); } } ``` the update is as follows: ``` public void Update() { ...generate a list of rows... Rows = ...rows... } ``` The problem occurs when the Update is called, the list view does update, but loses the sorting set previously on the CollectionViewSource.

Accepted Answer

If you are "newing" rows then any setting on the prior rows is gone. If you clear (not new) the rows then I think they will hold the setting. And you don't even want Rows = rows in update. After assign rows then. ``` NotifyPropertyChange("Rows"); ``` So the UI know to update If you are going to new then reassign ``` collectionView = CollectionViewSource.GetDefaultView(TableView.ItemsSource); collectionView.SortDescriptions.Clear(); collectionView.SortDescriptions.Add(new SortDescription(propertyName, direction)); ``` Maybe ``` private List rows = new List(); ``` and have that the only place you new it

My CollectionViewSource is not picking up changes

Solution

Problem