public void BuildTypeFromInterfaceILTests() { Type type = WrapperTypeBuilder.GetWrapperType <ITestModel>(); ITestModel instance = (ITestModel)Activator.CreateInstance(type); //set data and offset instance.GetType().GetField("data").SetValue(instance, new byte[] { 1, 0, 0, 0, 2, 0, 0, 0, 3, 0, 0, 0, 4, 0, 0, 0 }); instance.GetType().GetField("offset").SetValue(instance, 0); int a = instance.ID; int b = instance.Cuenta; instance.GetType().GetField("offset").SetValue(instance, 8); int c = instance.ID; int d = instance.Cuenta; Assert.AreEqual(1, a); Assert.AreEqual(2, b); Assert.AreEqual(3, c); Assert.AreEqual(4, d); }