DataGrid edition 'EditItem' is not allowed for this view` when bound to a WPF DataGrid

Question

I\'ve been reading about this at least for 4 hours, and seems to be the list type, but I have a situation:

A ObservableCollection that has a collection property.

Answer 1

Tks to @nit who give me the right path. Of course the problem reside on the base Type of EF collections

Hashet< T > And Datagrid need at least a List< T >, changing all my classes "those generated by Entity framework", give to me another problem, must make changes manually, and I have a lot of them.

My solution was to create a converter, that made the dirty work for me:

public class listToObservableCollection : BaseConverter, IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        HashSet observableList = (HashSet)value;
        return new ObservableCollection(observableList);
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return (HashSet)value;
    }
}

public abstract class BaseConverter : MarkupExtension
{
    public override object ProvideValue(IServiceProvider serviceProvider)
    {
        return this;
    }
}

And put it on the binding of my Datagrid2:

xmlns:l="clr-namespace:Recursos;assembly=Recursos"
...


...

ItemsSource="{Binding Level2,Converter={StaticResource listoToObservable}}"

The only thing on the air is how to make a generic converter, but for now it works fine.