Map a List to a Grouped DTO

I have a list of entities and I need to map it to a DTO, but grouped.

My entity Class:

Class myEntity
{
      public int id {get;set;}
      public double cost {get;set;}
}

My DTO Class

Class myEntityDTO
{
      public int id {get;set;}
      public double cost {get;set;}
}

My mapping:

CreateMap<myEntity, myEntityDTO>()
                //register all properties mapped
                ;

var entities = new List<myEntity>();
// fill the list
//  [
//          {1,50},
//          {1,30},
//          {1,25},
//          {2,80},
//          {2,20},
//          {2,45},
//          {2,38},
//          {3,10},
//          {3,15}
//   ]
Mapper.Map<List<myEntityDTO>>(entities);

I need to group my list of myEntity (by id for example, and sum cost), so, my DTO should be like this: [ {id: 1, cost: 105}, {id: 2, cost: 183}, {id: 3, cost: 25} ]

I hope I made myself clear, my english is not good.

Thanks in advance. Regards!

[lbargaoanu]

Even for mapping the grouping to the DTO, I still think AM wouldn’t be that useful because then you would have to customize the default map and it’s not auto anymore, is it? Just LINQ seems the best.

[lock[bot]]

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