Update an ObservableCollection with a background worker in MVVM

Question

Ok, I recently implemented a background worker to perform saving and loading of data.

However, getting this to work on a save command has proved difficult.

B

Answer 1

I found a blog post that uses the Dispatcher to manage all of the ObeservableCollection's methods. Here is a snip-it of the code, see the post for the entire class.

public class DispatchingObservableCollection : ObservableCollection
{
    /// 

    /// The default constructor of the ObservableCollection
    /// 
    public DispatchingObservableCollection()
    {
        //Assign the current Dispatcher (owner of the collection)
        _currentDispatcher = Dispatcher.CurrentDispatcher;
    }

    private readonly Dispatcher _currentDispatcher;

    /// 

    /// Executes this action in the right thread
    /// 
    ///The action which should be executed
    private void DoDispatchedAction(Action action)
    {
        if (_currentDispatcher.CheckAccess())
            action();
        else
            _currentDispatcher.Invoke(DispatcherPriority.DataBind, action);
    }

    /// 

    /// Clears all items
    /// 
    protected override void ClearItems()
    {
        DoDispatchedAction(() => base.ClearItems());
    }

    /// 

    /// Inserts a item at the specified index
    /// 
    ///The index where the item should be inserted
    ///The item which should be inserted
    protected override void InsertItem(int index, T item)
    {
        DoDispatchedAction(() => base.InsertItem(index, item));
    }