在 Entity Framework .NET5 中获取多级相关记录

Question

I have the following code. It brings back the Show and its related Slides . However Slide also has related Items but I have no idea how to make the query include those (There is a foreign key in the db).

Show sh = (from s in _context.Shows
           where s.ShowId == id
           select new Show()
           {
               ShowId=s.ShowId,
               ShowName=s.ShowName,
               Slides=s.Slides           
           }).FirstOrDefault();

How do I modify this to make it also fetch the list of Items for each Slide ?

I am using.Net5

Answer 1

If you defined your DbContext correctly the LINQ would be

Show sh = _context.Shows
    .Where(s => s.ShowId == id)
    .Include(s => s.Slides)
    .ThenInclude(sl => sl.Items)
    .FirstOrDefault();