Filtering navigation property in eager loading

问题

I have been working with soft delete and now i want to load the navigation properties of my entity that are not "deleted". I have found a way, my problem this way is not to clear for me, there is another way to do this.

Context.CreateSet().Include("Salary").Select(u => new {User= u, Salary = u.Salarys.Where(s => !s.Deleted)}).AsQueryable().Select(a => a.User).AsQueryable();

回答1:

Eager loading doesn't support filtering. Your code can be simplified to:

var users = Context.CreateSet<User>()
                   .Select(u => new {
                       User = u,
                       Salary = u.Salaries.Where(s => !s.Deleted)
                    })
                    .AsEnumerable()
                    .Select(a => a.User);

Include is not needed because you are replacing it with your own query and AsQueryable is not needed because the query is IQueryable all the time till called AsEnumerable which will sqitch to Linq-to-Objects when selecting users and selected salaries. EF will take care of correctly fixing navigation properties for you.

来源：https://stackoverflow.com/questions/12996617/filtering-navigation-property-in-eager-loading