PropertyGrid -从IList派生的属性，我如何添加到PropertyGrid以便用户可以添加/编辑/删

让我提供一点关于我是如何达到这一点的历史。

我最初在我的类中有一个属性，它派生自CollectionsBase，并将这个集合映射到PropertyGrid，用户可以随意从列表中添加/编辑/删除项。

然而，我不能映射CollectionsBase与NHibernate，因此我不得不放弃我的初始实现，而不是从CollectionsBase派生，我有类从IList派生。

现在我可以映射到NHibernate，但我无法通过PropertyGrid编辑集合。

我需要一些帮助，让他们俩好好相处。

在我的主类我有一个属性定义为:

    public virtual ZoneCollection Zones
    {
        get { return zones; }
        set { zones = value; }
    }

继承illist的My Zone Collection定义如下:

public class ZoneCollection : IList<Zone>, ICustomTypeDescriptor
{
    private IList<Zone> _list;
    public IList<Zone> _List
    {
        get { return _list; }
    }
    public ZoneCollection()
    {
        _list = new List<Zone>();
    }
    #region Implementation of IEnumerable
    public IEnumerator<Zone> GetEnumerator()
    {
        return _list.GetEnumerator();
    }
    IEnumerator IEnumerable.GetEnumerator()
    {
        return GetEnumerator();
    }
    #endregion
    #region Implementation of ICollection<Zone>
    public void Add(Zone item)
    {
        _list.Add(item);
    }
    public void Clear()
    {
        _list.Clear();
    }
    public bool Contains(Zone item)
    {
        return _list.Contains(item);
    }
    public void CopyTo(Zone[] array, int arrayIndex)
    {
        _list.CopyTo(array, arrayIndex);
    }
    public bool Remove(Zone item)
    {
        return _list.Remove(item);
    }
    public int Count
    {
        get { return _list.Count; }
    }
    public bool IsReadOnly
    {
        get { return false; }
    }
    #endregion
    #region Implementation of IList<Zone>
    public int IndexOf(Zone item)
    {
        return _list.IndexOf(item);
    }
    public void Insert(int index, Zone item)
    {
        _list.Insert(index, item);
    }
    public void RemoveAt(int index)
    {
        _list.RemoveAt(index);
    }
    public Zone this[int index]
    {
        get { return (Zone)_list[index]; }
        set { _list[index] = value; }
    }
    #endregion
    // Implementation of interface ICustomTypeDescriptor 
    #region ICustomTypeDescriptor impl
    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;
    }

    /// <summary>
    /// Called to get the properties of this type. Returns properties with certain
    /// attributes. this restriction is not implemented here.
    /// </summary>
    /// <param name="attributes"></param>
    /// <returns></returns>
    public PropertyDescriptorCollection GetProperties(Attribute[] attributes)
    {
        return GetProperties();
    }
    /// <summary>
    /// Called to get the properties of this type.
    /// </summary>
    /// <returns></returns>
    public PropertyDescriptorCollection GetProperties()
    {
        // Create a collection object to hold property descriptors
        PropertyDescriptorCollection pds = new PropertyDescriptorCollection(null);
        // Iterate the list of zones
        for (int i = 0; i < this._list.Count; i++)
        {
            // Create a property descriptor for the zone item and add to the property descriptor collection
            ZoneCollectionPropertyDescriptor pd = new ZoneCollectionPropertyDescriptor(this, i);
            pds.Add(pd);
        }
        // return the property descriptor collection
        return pds;
    }
    #endregion
}
/// <summary>
/// Summary description for CollectionPropertyDescriptor.
/// </summary>
public class ZoneCollectionPropertyDescriptor : PropertyDescriptor
{
    private ZoneCollection collection = null;
    private int index = -1;
    public ZoneCollectionPropertyDescriptor(ZoneCollection coll, int idx) :
        base("#" + idx.ToString(), null)
    {
        this.collection = coll;
        this.index = idx;
    }
    public override AttributeCollection Attributes
    {
        get
        {
            return new AttributeCollection(null);
        }
    }
    public override bool CanResetValue(object component)
    {
        return true;
    }
    public override Type ComponentType
    {
        get
        {
            return this.collection.GetType();
        }
    }
    public override string DisplayName
    {
        get
        {
            Zone zone = this.collection[index];
            return zone.ID.ToString();
        }
    }
    public override string Description
    {
        get
        {
            Zone zone = this.collection[index];
            StringBuilder sb = new StringBuilder();
            sb.Append(zone.ID.ToString());
            if (zone.Streets.Route != String.Empty || zone.Streets.Crossing != String.Empty)
                sb.Append("::");
            if (zone.Streets.Route != String.Empty)
                sb.Append(zone.Streets.Route);
            if (zone.Streets.Crossing != String.Empty)
            {
                sb.Append(" and ");
                sb.Append(zone.Streets.Crossing);
            }
            return sb.ToString();
        }
    }
    public override object GetValue(object component)
    {
        return this.collection[index];
    }
    public override bool IsReadOnly
    {
        get { return false; }
    }
    public override string Name
    {
        get { return "#" + index.ToString(); }
    }
    public override Type PropertyType
    {
        get { return this.collection[index].GetType(); }
    }
    public override void ResetValue(object component)
    {
    }
    public override bool ShouldSerializeValue(object component)
    {
        return true;
    }
    public override void SetValue(object component, object value)
    {
        // this.collection[index] = value;
    }
}

}

现在，当这个类从CollectionsBase派生时，我的ICustomTypeDescriptor和PropertyDescriptor工作得很好，但是现在它只是在属性名称中显示类名ZoneCollection，而没有"…"按钮来添加/编辑/从列表中删除项。

我做错了什么，现在它是从IList继承的，这是不工作?

如果我添加:

[TypeConverter(typeof(ExpandableObjectConverter))]

在ZoneCollection的开头，我得到了在可展开树中列出的列表中的项目，但这不是我要寻找的。在哪里"…"按钮去，打开了一个弹出窗口，使我能够添加/编辑/删除项目的集合，当我从IList继承而不是CollectionBase?

public class ZoneCollection : IList<Zone>, IList
{
    private List<Zone> _list = new List<Zone>();
    public ZoneCollection()
    {
    }
    public int IndexOf(Zone item)
    {
        return _list.IndexOf(item);
    }
    public void Insert(int index, Zone item)
    {
        _list.Insert(index, item);
    }
    public void RemoveAt(int index)
    {
        _list.RemoveAt(index);
    }
    public Zone this[int index]
    {
        get
        {
            return _list[index];
        }
        set
        {
            _list[index] = value;
        }
    }
    public void Add(Zone item)
    {
        _list.Add(item);
    }
    public void Clear()
    {
        _list.Clear();
    }
    public bool Contains(Zone item)
    {
        return _list.Contains(item);
    }
    public void CopyTo(Zone[] array, int arrayIndex)
    {
        _list.CopyTo(array, arrayIndex);
    }
    public int Count
    {
        get { return _list.Count; }
    }
    public bool IsReadOnly
    {
        get { return ((IList)_list).IsReadOnly; }
    }
    public bool Remove(Zone item)
    {
        return _list.Remove(item);
    }
    public IEnumerator<Zone> GetEnumerator()
    {
        return _list.GetEnumerator();
    }
    IEnumerator IEnumerable.GetEnumerator()
    {
        return GetEnumerator();
    }
    int IList.Add(object value)
    {
        int index = Count;
        Add((Zone)value);
        return index;
    }
    bool IList.Contains(object value)
    {
        return Contains((Zone)value);
    }
    int IList.IndexOf(object value)
    {
        return IndexOf((Zone)value);
    }
    void IList.Insert(int index, object value)
    {
        Insert(index, (Zone)value);
    }
    bool IList.IsFixedSize
    {
        get { return ((IList)_list).IsFixedSize; }
    }
    bool IList.IsReadOnly
    {
        get { return ((IList)_list).IsReadOnly; }
    }
    void IList.Remove(object value)
    {
        Remove((Zone)value);
    }
    object IList.this[int index]
    {
        get
        {
            return this[index];
        }
        set
        {
            this[index] = (Zone)value;
        }
    }
    void ICollection.CopyTo(Array array, int index)
    {
        CopyTo((Zone[])array, index);
    }
    bool ICollection.IsSynchronized
    {
        get { return ((ICollection)_list).IsSynchronized; }
    }
    object ICollection.SyncRoot
    {
        get { return ((ICollection)_list).SyncRoot; }
    }
}