How to do a refresh of a ListCollectionView without a reset

Romain

12y6.4k

Good morning,

I am working on a WPF application which is using an ObservableCollection.

I have an ObservableCollection of object ( ObservableCollection data; ) which is binding with a WPF datagrid. I bind the both with thoses following instructions :

ListCollectionView collection = new ListCollectionView(data);
collection.GroupDescriptions.Add(new PropertyGroupDescription("PathFile"));
datagridFile.ItemsSource = collection;

It is working fine and I have on my main window a list of object sorting by "PathFile". By a contextual menu when I click on the file name on the window, I would like to reorder the files. For example put the first to the second position. I do this by using those following instructions :

 private int m_indexSelectedToMove;

 private void MenuItem_Click(object sender, RoutedEventArgs e)
 {
      data.Move(m_indexSelectedToMove, m_indexSelectedToMove + 1);
      m_indexSelectedToMove = -1;
      var itemList = (ListCollectionView)datagridFile.ItemsSource;
      itemList.Refresh();
 }

But I noticed with debug that the command Refresh() reset the ListCollectionView and I would like to know how to do the same behavior without reset the data ?

Thank you in advance for any advice.

7 Replies

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Ramesh Maruthi12y ago
http://referencesource.microsoft.com/#PresentationFramework/src/Framework/System/Windows/Data/ListCollectionView.cs
Romain12y ago
Ok but it seems that I can not do that : http://msdn.microsoft.com/en-us/library/system.windows.data.listcollectionview%28v=vs.110%29.aspx
Ramesh Maruthi12y ago
itemList.Refresh();
instead of this
u have to do itemList.Items.Refresh();
Romain12y ago
I can do that : ListCollectionView itemList = (ListCollectionView)dataGridClutter.ItemsSource; itemList.Refresh(); But thre is still a problem cause the collection is reset.

Ramesh Maruthi12y ago

ListCollectionView  itemList = (ListCollectionView)datagridFile.ItemsSource;

can u try it now ?

Romain12y ago
there is a problem cause itemList doies not contain a definition for Items
Ramesh Maruthi12y ago
itemList.Items.Refresh();