how should I implement ICustomTypeDescriptor or a TypeDescriptionProvider so I have a consistent binding source for Winforms and webcontrols

Question

Hi there.

I have a datasource that is hierachy of objects defined as

public interface ILink
{
    Program Program { get; set; }
    int Linkid { get; set; }
    string SID { get; set; }
    bool IsActive { get; set; }
}

and

[Serializable()]
public abstract class AbstractLink : ISerializable, ILink, IEquatable<ILink>, ICloneable
{
      //implementation
}

I am able to bind to a deeply nested field (Program.Name) by using a custom collection class and implementing PropertyDescriptorcollection like so

public class ILinkCollection : List<ILink>, ITypedList
{
    protected IILinkViewBuilder _viewBuilder;

    public ILinkCollection(IILinkViewBuilder viewBuilder)
    {
        _viewBuilder = viewBuilder;
    }

    #region ITypedList members

    protected PropertyDescriptorCollection _props;

    public PropertyDescriptorCollection GetItemProperties(PropertyDescriptor[] listAccessors)
    {
        if (_props == null)
        {
            _props = _viewBuilder.GetView();
        }
        return _props;
    }
    public string GetListName(PropertyDescriptor[] listAccessors)
    {
        return "";
    }
}

public class ILinkProgramView : IILinkViewBuilder
{
    public PropertyDescriptorCollection GetView()
    {
        List<PropertyDescriptor> props = new List<PropertyDescriptor>();
        IProgramDelegate del = delegate(ILink d)
        {
            return d.Program.Name;
        };
        props.Add(new ILinkProgramDescriptor("FullName", del, typeof(string)));
        del = delegate(ILink dl) { return dl.IsActive; };
        props.Add(new ILinkProgramDescriptor("IsActive", del, typeof(string)));
        PropertyDescriptor[] propArray = new PropertyDescriptor[props.Count];
        props.CopyTo(propArray);
        return new PropertyDescriptorCollection(propArray);
    }
}

and the property descriptor abbreviated

public class ILinkProgramDescriptor : PropertyDescriptor
{
    protected IProgramDelegate _method;
    protected Type _methodReturnType;

    public ILinkProgramDescriptor(string name, IProgramDelegate method, Type methodReturnType)
        : base(name, null)
    {
        _method = method;
        _methodReturnType = methodReturnType;
    }
 }

Now while convoluted this is actually a really flexible and useful setup - creating my own binding implementations that allow nested fields. The problem I have is this doesnt work for web controls. Does anyone know how I can implement ICustomTypeDescriptor or a TypeDescriptionProvider so I have a consistent binding source for Winforms and webcontrols.