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    <p>Solution #3: by-far the best, no need to cast anything, no need to ask the type of the input list (repeatedly), much much cleaner. Please compare with Answer/Solution #2 above. </p> <p><strong>(#3)</strong> accomplishes exactly the goal I was seeking, common code for the logic that process either IXList or IYList. And as an extension method the user gets the 'GetAllItems' typed version desired...</p> <pre><code> internal static IEnumerable&lt;IXOutList&gt; GetAllLineItems(this IXList list) { TListEnumeratorBase genList = new IXListEnum(list); return GetAllLineItemsGeneric&lt;IXOutList&gt;(genList); } internal static IEnumerable&lt;IYOutList&gt; GetAllLineItems(this IYList list) { TListEnumeratorBase genList = new IYListEnum(list); return GetAllLineItemsGeneric&lt;IYOutList&gt;(genList); } private static IEnumerable&lt;Zout&gt; GetAllLineItemsGeneric&lt;Zout&gt;(TListEnumeratorBase genList) where Zout : class { try { genList.Head(); } catch (Exception) { yield break; } Guid guid = Marshal.GenerateGuidForType(typeof(Zout)); do { Zout rec = null; try { IntPtr lineItemPointer; lineItemPointer = genList.GetTxnItem(ref guid); rec = Marshal.GetObjectForIUnknown(lineItemPointer) as Zout; } catch (Exception) { yield break; } if (rec != null) yield return rec; else yield break; try { genList.Next(); } catch (Exception) { yield break; } } while (true); } public abstract class TListEnumeratorBase { public abstract void Head(); public abstract void Next(); public abstract IntPtr GetTxnItem(ref Guid guid); } public class IXListEnum : TListEnumeratorBase { IXList _list; public IXListEnum(IXList list) { _list = list; } public override void Head() { _list.Head(); } public override void Next() { _list.Next(); } public override IntPtr GetTxnItem(ref Guid guid) { IntPtr lineItemPointer; _list.Get(ref guid, out lineItemPointer); return lineItemPointer; } } public class IYListEnum : TListEnumeratorBase { IYList _list; public IYListEnum(IYList list) { _list = list; } public override void Head() { _list.Head(); } public override void Next() { _list.Next(); } public override IntPtr GetTxnItem(ref Guid guid) { IntPtr lineItemPointer; _list.Get(ref guid, out lineItemPointer); return lineItemPointer; } } </code></pre>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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