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copied!<p>It sounds like your collection implements <code>IEnumerable</code>, not <code>IEnumerable<T></code>, hence you need:</p> <pre><code>_resources.Cast<LanguageEditorResource>().Where(r => r.IsDirty) </code></pre> <p>Note that <code>Enumerable.Where</code> is defined on <code>IEnumerable<T></code>, not <code>IEnumerable</code> - if you have the non-generic type, you need to use <code>Cast<T></code> (or <code>OfType<T></code>) to get the right type. The difference being that <code>Cast<T></code> will throw an exception if it finds something that isn't a <code>T</code>, where-as <code>OfType<T></code> simply ignores anything that isn't a <code>T</code>. Since you've stated that your collection <em>only</em> contains <code>LanguageEditorResource</code>, it is reasonable to check that assumption using <code>Cast<T></code>, rather than silently drop data.</p> <p>Check also that you have "using System.Linq" (and are referencing System.Core (.NET 3.5; else LINQBridge with .NET 2.0) to get the <code>Where</code> extension method(s).</p> <p>Actually, it would be worth having your collection implement <code>IEnumerable<LanguageResource></code> - which you could do quite simply using either the <code>Cast<T></code> method, or an iterator block (<code>yield return</code>).</p> <p>[edit] To build on Richard Poole's note - you could write your <em>own</em> generic container here, presumably with <code>T : LanguageResource</code> (and using that <code>T</code> in the <code>Dictionary<string,T></code>, and implementing <code>IEnumerable<T></code> or <code>ICollection<T></code>). Just a thought.</p>

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