Question

I have the following EF Expression:

var complexes = db.ResidentialComplexes.AsNoTracking()
                .Where(rc => rc.MasterEntity == entity)
                .Select(rc => new CustomComplexObj()
                {
                    ComplexId = rc.ComplexId,
                    Name = rc.Name,
                    Region = rc.Region,

                    Properties = rc.CurrentProperties.Select(p=> new CustomPropertyObj(){
                         Name = p.Name,
                         PropertyId = p.PropertyId
                    }).ToList()

                }).ToList();

Im getting an error when setting:

Properties = rc.CurrentProperties.Select(p=> new CustomPropertyObj(){
                             Name = p.Name,
                             PropertyId = p.PropertyId
                        }).ToList()

This is the error:

LINQ to Entities does not recognize the method ‘System.Collections.Generic.List1[CondoTrack.Model.Poco.CustomPropertyObj] ToList[CustomPropertyObj](System.Collections.Generic.IEnumerable1[CondoTrack.Model.Poco.CustomPropertyObj])’ method, and this method cannot be translated into a store expression.

Any clue on how to get the desired result?

Answer 1

Remove the ToList() and change the Properties type to IEnumerable<T> instead of List<T>. As it is stated in the error, ToList is not supported by Linq to Entities.