Custom mapping when mapping to new or existing entities-CodePudding

I'm already successfully using AutoMapper in my ASP.NET Core application. I'm creating mapping configurations and mostly use ForMember, BeforeMap or AfterMap to customize certain mappings.

Now I have a particular scenario in which I import data and I update an existing entity if it exists or create a new if it doesn't. I would like to also use AutoMapper to map entities.

For example (kept simple) I have an import class:

public class ImportModel
{
    public int Number { get; set; }
    public string Description { get; set; }
}

And the actual model class:

public class ActualModel
{
    public int Id { get; set; }
    public int Number { get; set; }
    public string Description { get; set; }
}

As I parse and iterate through the import rows I currently do:

var model = modelService.Get(x => x.Number == item.Number);
if (model != null)
{
    model.Description = item.Description ;
}
else
{
    model = new ActualModel() {
        Number = item.Number,
        Description = item.Description 
    };
}

Now, basically I would like to change the above into (hopefully) a single line using a mapping configuration to add/update a model.

Is it possible to achieve this (maybe using additional AutoMapper features customer resolvers, construcstors, etc)?

CodePudding user response：

The overload

destination = mapper.Map<TSource, TDestination>(source, destination);

does the trick.