Question

i have a many to many relationship tables, movie and tag in code first approach in my MVC application. i want the user to be able to select all movies that is associted with tag. for example i want to select all movies that has tag id =2. i need lambda query that will allow me do this.Any help with appreciated.

Answer 1

This is one way:

var moviesWithTag2 = context.Movies
    .Where(m => m.Tags.Any(t => t.Id == 2))
    .ToList();

This will return an empty collection if there is no tag with Id=2.

Alternative (which will return null if there is no tag with Id=2):

var moviesWithTag2 = context.Tags
    .Where(t => t.Id == 2)
    .Select(t => t.Movies)
    .SingleOrDefault();

If you also want the Tag entity you could just load it including its movies:

var tag2 = context.Tags.Include(t => t.Movies)
    .Single(t => t.Id == 2);

tag2.Movies will contain the movies with tag Id=2.