Upgrading to .NET 4.5: An ItemsControl is inconsistent with its items source

Question

I\'m building an application, which uses many ItemControls(datagrids and listviews). In order to easily update these lists from background threads I used this extension to O

Answer 1

This is for Windows 10 Version 1607 users using the release version of VS 2017 that may have this issue.

Microsoft Visual Studio Community 2017
Version 15.1 (26403.3) Release
VisualStudio.15.Release/15.1.0+26403.3
Microsoft .NET Framework
Version 4.6.01586

You didn't need the lock nor EnableCollectionSynchronization.

    
        
            
                

            
        
    


public ObservableCollection fontFamilyItems;
public ObservableCollection FontFamilyItems
{
    get { return fontFamilyItems; }
    set { SetProperty(ref fontFamilyItems, value, nameof(FontFamilyItems)); }
}

public string fontFamilyItem;
public string FontFamilyItem
{
    get { return fontFamilyItem; }
    set { SetProperty(ref fontFamilyItem, value, nameof(FontFamilyItem)); }
}

private List GetItems()
{
    List fonts = new List();
    foreach (System.Windows.Media.FontFamily font in Fonts.SystemFontFamilies)
    {
        fonts.Add(font.Source);
        ....
        other stuff..
    }
    return fonts;
}

public async void OnFontFamilyViewLoaded(object sender, EventArgs e)
{
    DisposableFontFamilyViewLoaded.Dispose();
    Task> getItemsTask = Task.Factory.StartNew(GetItems);

    try
    {
        foreach (string item in await getItemsTask)
        {
            FontFamilyItems.Add(item);
        }
    }
    catch (Exception x)
    {
        throw new Exception("Error - " + x.Message);
    }

    ...
    other stuff
}