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copied!<p>A lambda expression is convertible to either a delegate type or an expression tree with the right signature - but you need to specify which delegate type it is.</p> <p>I think your code would be <em>much</em> simpler if you made this a generic method:</p> <pre><code>public static List<object> ConvertToListOfObjects<T>(List<T> list) { return list.ConvertAll<object>(t => t); } </code></pre> <p>Then you just need to find and invoke <em>that</em> method generically:</p> <pre><code>MethodInfo method = typeof(Foo).GetMethod("ConvertToListOfObjects", BindingFlags.Static | BindingFlags.Public); Type listType = list.GetType().GetGenericArguments()[0]; MethodInfo concrete = method.MakeGenericMethod(new [] { listType }); List<object> objectList = (List<object>) concrete.Invoke(null, new object[]{list}); </code></pre> <p>Complete example:</p> <pre><code>using System; using System.Reflection; using System.Collections.Generic; class Test { public static List<object> ConvertToListOfObjects<T>(List<T> list) { return list.ConvertAll<object>(t => t); } static void Main() { object list = new List<int> { 1, 2, 3, 4 }; MethodInfo method = typeof(Test).GetMethod("ConvertToListOfObjects", BindingFlags.Static | BindingFlags.Public); Type listType = list.GetType().GetGenericArguments()[0]; MethodInfo concrete = method.MakeGenericMethod(new [] { listType }); List<object> objectList = (List<object>) concrete.Invoke(null, new object[] {list}); foreach (object o in objectList) { Console.WriteLine(o); } } } </code></pre>

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