ASP.Net MVC C＃AutoMapper使用Where语句

Question

using AutoMapper - is it possible, when mapping a domain to a viewmodel, to use the where statement, to limit what is mapped to the viewmodel, eg. I use the following to map the Offer list to the OfferVM viewmodel:

vm.Offers = Mapper.Map<IList<Offer>, IList<OfferVM>>(offers);

However, I only want to map items in the list Offer to OfferVM if a property on the Offer is set to true, eg:

vm.Offers = Mapper.Map<IList<Offer>, IList<OfferVM>>(offers)
           .Where(x => x.RoomName1s==true);

But this gives the error:

Cannot implicitly convert type
'System.Collections.Generic.IEnumerable<FGBS.ViewModels.OfferVM>'
  to 
'System.Collections.Generic.IList<FGBS.ViewModels.OfferVM>'. 
 An explicit conversion exists (are you missing a cast?)

Thanks for any help.

Mark

Answer 1

You need to convert the IEnumerable<OfferVM> returned by Where into IList<OfferVM> using ToList()

 vm.Offers = Mapper.Map<IList<Offer>, IList<OfferVM>>(offers)
       .Where(x => x.RoomName1s==true)
       .ToList();

Answer 2

您需要添加.ToList()以将IEnumerable转换为List。