WPF DataGrid编辑难度（InvalidOperationException）

Question

I have a DataGrid that I am filling with information from an ObservableCollection<ObservableCollection<T>> where T is an object of mine that implements IEditableObject .

I have the DataGrid correctly filling with the information I need. The problem is that when I go to edit a box in it I get an exception.

System.InvalidOperationException: 'EditItem' is not allowed for this view

followed by the subsequent stack trace.

I understand binding as well as the idea that in an ObservableCollection<T> if you want to be able to edit the DataGrid items than you need to implement the IEditableObject interface in the object T .

I'm not sure why it won't let me edit, although I'm leaning more towards the idea that I need to attach my object to some type of view.

I've not found much on what I'm trying to do but I have been fairly successful up until this point in getting over hurdles. If anyone has any insight as to what I should do it is much appreciated.

Also, I will post code if someone would seriously like to see it but I believe it's less about what I've already written and more about what I still need to write.

Edit: Added code

private void dg_DataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
    {
        DataGrid grid = sender as DataGrid;
        grid.Columns.Clear();
        TableNode node = e.NewValue as TableNode;
        if (node != null)
        {
            InfoTable dti = new InfoTable(m_model.EditNode.Database.Path, node.FullName);
            int index = 0;
            foreach (string colName in dti.Columns)
            {
                DataGridTextColumn col = new DataGridTextColumn();
                col.Header = colName;
                col.Binding = new Binding("[" + index + "].Info");
                //Note: .Info is the information string in the class T containing the data that may or may not be edited
                grid.Columns.Add(col);
                index++;
            }
            grid.ItemsSource = dti;
        }
    }

Here I am binding the columns to each ObservableCollection in the ObservableCollection<ObservableCollections<T>> that is in my InfoTable . I have implemented IEnumerable and INotfiyPropertyChange in the InfoTable .

Answer 1

I'm pretty sure your InfoTable class needs to implement IList , too, in order to support DataGrid editing.

IList adds the capability of adding and removing items, and the DataGrid probably needs that to manage its rows.