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    <ol> <li><p>not at current, no; the type exposed <em>must</em> have (at a minimum) an <code>Add</code> method. While I have no objection to <em>investigating</em> the possibility of an <code>Add</code> outside the object itself, this is complicated since you are then looking at a different "primary" object (the sequence vs the container). However; if your <strong>parent</strong> object implemented <code>IEnumerable&lt;T&gt;</code> (returning <code>_itemsSet.GetEnumerator()</code> etc), then it would find the <code>Add</code> automatically</p></li> <li><p>I can't see the context here; however, I suspect that without the <code>Add</code> it still isn't happy to consider it a list <em>in the first place</em>. I see the way you are going with that, though, and it is perhaps a way it could reason "I can use a <code>List&lt;T&gt;</code> here)</p></li> <li><p>It isn't something I've investigated, to be honest; so: no</p></li> <li><p>The type exposed in the property must, as a minimum: implement <code>IEnumerable</code> (although <code>IEnumerable&lt;T&gt;</code> would be preferred), and expose an <code>Add(T)</code> method. It doesn't have to be <code>Collection&lt;T&gt;</code> / <code>List&lt;T&gt;</code> / etc - simply: it must (at present) have <em>some</em> mechanism to add. <code>IList&lt;T&gt;</code> would be a a pragmatic option, but I gather that isn't quite what you want.</p></li> </ol> <p>Jonathan is right that a surrogate <strong>for the outer-class</strong> (the thing which <em>has</em> <code>_itemsSet</code>, <code>TSet</code> and <code>AddT</code>) might also be an option.</p> <p>If the outer-class <em>only</em> exists to have the collection and the add method, then just adding <code>: IEnumerable&lt;T&gt;</code> and renaming <code>AddT</code> to <code>Add</code> would probably make it work.</p>
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    1. COWhat about my IEnumerableT serialization problem? I have run my code in debug mode with latest protobuf-net source code and there is no Collection | IEnumerable<T> handling code in ValueMember.cs : TryGetCoreSerializer LINE:330 So I get exception at ValueMember.cs line:262.
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    2. CO@Alex *by itself*, `IEnumerable<T>` is not serializable, since it can't robustly deserialize it. At best, I can give you a better error message! It *can* (I really, really hope) handle "Collection" - but it needs to have some API *on the exposed type* to `Add` things.
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    3. COAre you planing to continue to work on protobuf-net and extend it? What is project status? I'm was hoping to use it in real life project, but in it's current state, it's unusable for me, thought it's still better than to write my own solution from scratch.
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