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I'm experimenting with DynamicObject . One of the things I try to do is setting the values of ref / out arguments, as shown in the code below. However, I am not able to have the values of i and j in Main() set properly (even though they are set correctly in TryInvokeMember() ). Does anyone know how to call a DynamicObject object with ref / out arguments and be able to retrieve the values set inside the method? class Program { static void Main(string[] args) { dynamic proxy = new Proxy(new Target()); int i = 10; int j = 20; proxy.Wrap(ref i, ref j); Console.WriteLine(i + ":" + j); // Print "10:20" while expect "20:10" } } class Proxy : DynamicObject { private readonly Target target; public Proxy(Target target) { this.target = target; } public override bool TryInvokeMember(InvokeMemberBinder binder, object[] args, out object result) { int i = (int) args[0]; int j = (int) args[1]; target.Swap(ref i, ref j); args[0] = i; args[1] = j; result = null; return true; } } class Target { public void Swap(ref int i, ref int j) { int tmp = i; i = j; j = tmp; } } Update 7/15: Microsoft claims to have fixed the issue for the next release of .NET http://connect.microsoft.com/VisualStudio/feedback/details/543101/net-4-0s-dynamicobject-doesn-t-set-ref-out-arguments Update 9/8/2012: Tested using VS.NET 2012 with both .NET 4.0 and 4.5, confirm: it's already fixed.

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