Make Distinct Entity Framework

Question

I’m trying to accomplish the Distinct, in my model of Phones, but none of the options I’m trying to make work. Could tell me what I’m doing wrong ?

Below I described several ways I have tried to do, but none of them worked for me, could give me a light ?

model.Phones = model.Phones.Where(x => x != null && x.Phone != null).ToList();
1ª - model.Phones = (from p in model.Phones select p).Distinct().ToList();
2ª - model.Phones = model.Phones.Select(a => a).Distinct().ToList();

I tried it both ways above, nothing else works.

Example of how I receive the data below:

I’ve tried to do it this way:

model.Phones = model.Phones.Select(x => x.Phone).Distinct().ToList();

I get following error:

Cannot implicitly convert type 'System.Collections.Generic.List<string>' to 'System.Collections.Generic.List<KonBase.Areas.Admin.Models.ApplicationCondominiumViewModels.PhoneViewModel>'

And:

model.Phones = model.Phones.GroupBy(x => x.Phone).ToList();

I get following error:

Cannot implicitly convert type 'System.Collections.Generic.List<System.Linq.IGrouping<string, KonBase.Areas.Admin.Models.ApplicationCondominiumViewModels.PhoneViewModel>>' to 'System.Collections.Generic.List<KonBase.Areas.Admin.Models.ApplicationCondominiumViewModels.PhoneViewModel>'

Answer 1

I just found out, actually by comparing the objects the distinct does not evaluate them as being equal. Some alternatives are: Group by:

List<Phones> teste = Phones.GroupBy(x=>x.Phone).ToList();

Select in field(will return a list of strings) before distinct

List<String> teste = Phones.Select(a => a.nome).Distinct().ToList();