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    <p>The PropertyGrid is an old grumpy beast. It needs the non-generic <a href="http://msdn.microsoft.com/en-us/library/system.collections.ilist.aspx" rel="nofollow">IList</a> explicit implementation, not the generic one.</p> <p>As a site note, you could derive ZoneCollection directly from <code>List&lt;Zone&gt;</code>, and you don't need any ICustomTypeDescriptor / PropertyDescriptor, with regards to this PropertyGrid issue.</p> <p>Here is an implementation that seems to work:</p> <pre><code>public class ZoneCollection : IList&lt;Zone&gt;, IList { private List&lt;Zone&gt; _list = new List&lt;Zone&gt;(); 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&lt;Zone&gt; 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; } } } </code></pre>
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    1. POPropertyGrid - Property derived from IList<T>, How do I add to the PropertyGrid so user can Add/Edit/Remove items
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    1. USSimon Mourier
    1. USSimon Mourier
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    1. COYes, but NHibernate requires an IList and not a List. Did I not use the non-gneric IList implementation using IList<Zone>? Or do I have to define it as derived from IList then set my list inside it to be of the specific type?
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      1. USNathan Raley
    2. CO@Nathan - for a code that would do a cast (as, is), it would work, it *is* implemented, but the PropertyGrid code uses reflection and just checks IList is implemented directly by the class. You can keep the generic implementation, but you need to just add IList (and implement it)
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    3. COOkay, instead of deriving from IList<Zone>, I derived from IList. In the constructor for the ZonesCollection I set the IList _list equal to new List<Zone>(). This now lists the property Zone in the PropertyGrid with the "..." button; however, the properties for the Zone in the collection editor are not displayed. Any ideas?
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