EF. How to include only some sub results in a model? - entity-framework

Question

I'm trying to select list of Users and for each User JobTitle in correct language depended of strLang selected by user.
Something like that:
IList<User> myData;
myData = Context.Users.Where(u => u.Location == strLocation)
.Include(u => u.JobTitles.Where(e => e.Language == strLang))
.ToList();
But it seems Include doesn't like Where clause

Answer 1

You can't conditionally include only a few entities of a related collection, so you should use projection to get the stuff you need:
IList<User> myData;
var temp = Context.Users.Where(u => u.Location == strLocation)
.Select(u => new
{
User = u;
Locations = u.JobTitles.Where(e => e.Language == strLang));
});
foreach(var t in temp)
{
User user = t.User;
user.Locations = t.Locations;
myData.Add(user);
}

Answer 2

You cannot do it by using the "Include" method since it only take naviation properties.
Disclaimer: I'm the owner of the project EF+ on github.
EF+ Query IncludeFilter allow you to easily filter related entities:
// using Z.EntityFramework.Plus; // Don't forget to include this.
IList<User> myData;
myData = Context.Users.Where(u => u.Location == strLocation)
.IncludeFilter(u => u.JobTitles.Where(e => e.Language == strLang))
.ToList();
You can find the project here
You can find the documentation here
Behind the code, IncludeFilter do exactly like Alexander answer by using a projection.