private static object GenerateCollection(Type collectionType, int size, Dictionary <Type, object> createdObjectReferences) { Type type = collectionType.IsGenericType ? collectionType.GetGenericArguments()[0] : typeof(object); object result = Activator.CreateInstance(collectionType); MethodInfo addMethod = collectionType.GetMethod("Add"); bool areAllElementsNull = true; ObjectGenerator objectGenerator = new ObjectGenerator(); for (int i = 0; i < size; i++) { object element = objectGenerator.GenerateObject(type, createdObjectReferences); addMethod.Invoke(result, new object[] { element }); areAllElementsNull &= element == null; } if (areAllElementsNull) { return(null); } return(result); }