Recently I gave a talk on Automapper in Ottawa .Net Community, so I though I would post the main ideas of the presentation here also.

The demo was based on an Order System where there were just 3 tables/classes, “Order”, “Customer” and “OrderItems”

From the diagram we can see that a Customer has a Bio and if we pull out all the customer from a repository and display it, we may have some of them whom are missing the Bio.

Here is the code of how we are mapping our domain objects to a Dto or ViewModel, we are basically just passing the data to the View to render

Now lets say you want to replace the Null Bio with something like “N/A”, some people may go directly to the razor view code and add that but we can do better with automapper, we can tell automapper that when there is a Null just substitute it with something else, our code would then look like

In doing so we will use the same View but now we have “N/A” for “Uncle Leo” bio.

In part2 we will be talking about how to flatten objects by convention.