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    <p>I don't know what you're doing wrong.</p> <p>Here is a <a href="http://linqpad.net" rel="nofollow">LINQPad</a> program that demonstrates, and it seems it uses the same calls that you do, yet I do get an output of the right type of array.</p> <pre><code>void Main() { object valueObj = new List&lt;object&gt; { 1, 2, 3 }; Type type = typeof(int[]); Type elementType = type.GetElementType(); MethodInfo castMethod = typeof(Enumerable).GetMethod("Cast") .MakeGenericMethod( new System.Type[]{ elementType } ); MethodInfo toArrayMethod = typeof(Enumerable).GetMethod("ToArray") .MakeGenericMethod( new System.Type[]{ elementType } ); var castedObjectEnum = castMethod.Invoke(null, new object[] { valueObj }); var castedObject = toArrayMethod.Invoke(null, new object[] { castedObjectEnum }); castedObject.Dump(); } </code></pre> <p>I <em>do</em> get an output corresponding to an array of int's. The code as posted seems to work just fine. Your problem must be elsewhere. Could it be that you're not actually sending in a property <code>List&lt;object&gt;</code> or that the list contains something that isn't an int?</p> <p>Just changing this line:</p> <pre><code>object valueObj = new List&lt;object&gt; { 1, 2, 3 }; </code></pre> <p>to this:</p> <pre><code>object valueObj = new List&lt;object&gt; { 1, 2, 3, "Test" }; </code></pre> <p>Gives me that exception.</p> <p>Perhaps you want <code>OfType</code> instead of <code>Cast</code>?</p> <p>If you replace the string in the <code>castMethod</code> retrieval, it again "works", but of course it will filter away that string.</p> <p>More information is needed here.</p>
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    1. COyou are right, there is something wrong with my valueObj. the type is System.Collections.Generic.List`1[System.Object] and looping all objects and Convert.ToInt32 (there are just three 0s). but thanks i will investigate in that direction now what's wrong
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    2. COin this case i had the List<System.Int64> thats why it was not working. i will see what i need to adjust to cover this case
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