C# automapper nested object conditional map

Question

I'm using .Net Core with latest automapper version and I've a question on nested objects.

I've a view model like below (This I can't change as its a 3rd party one):

public class MyTempA
{ 
    string ShapeName;
    object ShapeDetails;
    //....some other props
}

I've db classes and view models for below

Square (DB Entity)
SquareViewModel
Pyramid (DB Entity)
PyramidViewModel
Cylinder (DB Entity)
CylinderViewModel

I've individual mappers existing for above DB entities to view models.

My question: ShapeDetails object in MyTempA can be any of the view models based on ShapeName. How can I map that using Automapper?

If ShapeName is Square, ShapeDetails should be SquareViewModel (mapped from Square db class).

Thanks

Dharman · Accepted Answer · 2021-11-29 09:09:59Z

2

There are two options you could use:

The first one is to use the mapping inheritance feature provided by AutoMapper if your classes have a base class.

https://docs.automapper.org/en/stable/Mapping-inheritance.html

As a second option you could write a custom value resolver:

https://docs.automapper.org/en/stable/Custom-value-resolvers.html

edited Nov 29, 2021 at 9:09

Dharman♦

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answered Nov 29, 2021 at 9:04

niQu

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2 Comments

user6095576 Over a year ago

Thanks v much. I dont have a base class so I have to go through second option. I am going through articles for Custom Value Resolver but they are showing only for static properties (like int, decimal...), I dont see a mapper/ViewModel returned. Do you have any example link?

niQu Over a year ago

Here is a basic example of how it could look lile: gist.github.com/NQuirmbach/df606e2b32cedfd3e3f847a4bf81769e

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