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    <p>Comparing the compiled and the emitted output, there's only one difference:</p> <p>Compiled:</p> <pre><code>callvirt instance int32 ReflectionServices.Node::get_NodeId() </code></pre> <p>Emitted:</p> <pre><code>call instance int32 ReflectionServices.Node::get_NodeId() </code></pre> <p>The type you're calling <code>int32 get_NodeId()</code> on is <code>ReflectionServices.Node</code>, but the type of the object you're passing into the method you're trying to replicate is <code>Address</code>. This leads me to believe that the property accessor defined on <code>ReflectionServices.Node</code> must be called virtually, perhaps because it inherits from another class (or implements an interface) that declares that property before <code>ReflectionServices.Node</code> implements it.</p> <p>When you're emitting that line of code, simply call it virtually:</p> <pre><code>@this.Emit(OpCodes.Callvirt, getMethod); </code></pre> <hr> <p><strong>EDIT: In light of the further provided code, here's the <em>real</em> solution.</strong></p> <p>So, you have a problem with the fundamentals of how you're implementing the interface:</p> <pre><code>var method = type.DefineMethod(methodName, MethodAttributes.Static | Method... // ^^^^^^ </code></pre> <p>Interface methods are not static; they're instance members. Thus, you first need to remove <code>MethodAttributes.Static</code> from the attributes flag upon creating the <code>MethodBuilder</code>.</p> <p>Second, when you go to return this function, you're going to have to include a <em>target object</em>, which is the instance upon which the method is called. To do that, you can use <a href="http://msdn.microsoft.com/en-us/library/system.activator.createinstance.aspx" rel="nofollow"><code>Activator.CreateInstance</code></a> to call the default-generated constructor and give you an instantiated object to use as the target. Replace the final line of your <code>Generate</code> method with these lines to achieve that.</p> <pre><code>var activatedObject = Activator.CreateInstance(type); return (Action&lt;TObject, TInstance&gt;)Delegate.CreateDelegate( typeof(Action&lt;TObject, TInstance&gt;), activatedObject, createdMethod); </code></pre>
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    1. COYou are right the Address class inherits from Node which has the NodeId property. I tried your Change and just called the OpCodes.Callvirt but it still has the same error...
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    2. COWell, if the generated IL matches up, something else must be the problem. Can you amend your post to include your calls to `DefineType` and `DefineMethod`?
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    3. COOk I will add it tomorrow, thanks for looking.
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