Responding to CollectionChanged event in PropertyGrid

[obiben]

#43966 |

Hi,

I’ve got a PropertyGrid in a project with a Property that is a collection. Now I know about the CollectionEditor, but I don’t like it. I like editing my objects right in the list, so I’ve got this property:

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xceed.Wpf.Toolkit.PropertyGrid.Attributes;
using Xceed.Wpf.Toolkit.PropertyGrid.Editors;

namespace QJExternalTool
{
    [ExpandableObject]
    public class IntentionList : ObservableCollection<OrderIntention>, ICustomTypeDescriptor
    {
        // Implementation of ICustomTypeDescriptor: 

        public String GetClassName()
        {
            return TypeDescriptor.GetClassName(this, true);
        }

        public AttributeCollection GetAttributes()
        {
            return TypeDescriptor.GetAttributes(this, true);
        }

        public String GetComponentName()
        {
            return TypeDescriptor.GetComponentName(this, true);
        }

        public TypeConverter GetConverter()
        {
            return TypeDescriptor.GetConverter(this, true);
        }

        public EventDescriptor GetDefaultEvent()
        {
            return TypeDescriptor.GetDefaultEvent(this, true);
        }

        public PropertyDescriptor GetDefaultProperty()
        {
            return TypeDescriptor.GetDefaultProperty(this, true);
        }

        public object GetEditor(Type editorBaseType)
        {
            return TypeDescriptor.GetEditor(this, editorBaseType, true);
        }

        public EventDescriptorCollection GetEvents(Attribute[] attributes)
        {
            return TypeDescriptor.GetEvents(this, attributes, true);
        }

        public EventDescriptorCollection GetEvents()
        {
            return TypeDescriptor.GetEvents(this, true);
        }

        public object GetPropertyOwner(PropertyDescriptor pd)
        {
            return this;
        }

        public PropertyDescriptorCollection GetProperties(Attribute[] attributes)
        {
            return GetProperties();
        }

        public PropertyDescriptorCollection GetProperties()
        {
            // Create a new collection object PropertyDescriptorCollection
            PropertyDescriptorCollection pds = new PropertyDescriptorCollection(null);

            // Iterate the list of employees
            for (int i = 0; i < this.Count; i++)
            {
                OrderIntentionItemDescriptor pd = new
                              OrderIntentionItemDescriptor(this, i);
                pds.Add(pd);
            }
            return pds;
        }

        public override string ToString()
        {
            return base.Count.ToString();
        }
    }
}

My problem is the PropertyGrid does not update the list when items are added or removed to the collection. How would I go about notifying it that it needs to re-list the properties?

[Fawzi [Xceed]]

#43967

Hi,

Could you send me a simple stand alone sample project which reproduces the issue so that I could have a closer look. You may send it to: support@xceed.com

[obiben]

#43968

Project sent

[Fawzi [Xceed]]

#43969

Hi,

Try adding a check to collection changed to be notified on each addition or removal:

DummySpread.Intentions.CollectionChanged += Intentions_CollectionChanged.

In the callback, reset the SelectedObject. If you want to keep the PropertyItem expanded, you can expand it :

private void Intentions_CollectionChanged( object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e )
{
_speadPropertyGrid.SelectedObject = null;
_speadPropertyGrid.SelectedObject = DummySpread;
_speadPropertyGrid.ExpandProperty( “Intentions” );
}

[obiben]

#43977

Oh yeah, that’ll do it. 🙂 Nice addition by the way, ExpandProperty!

[Author]

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