How to get ThenInclude to work in LINQPad 5? I'm getting the error " does not contain a definition for 'ThenInclude'"


  • What version of EF are you using? I only think EF core has this.
  • Core 2.0. . How to get it to work with linqpad?
  • edited February 2018
    The following works for me with the EF Core 2.0 driver:

    Blog.Take (100).Include (b => b.Posts).ThenInclude (p => p.Blog)

    Just as with Visual Studio, you won't see the ThenInclude method appear in the autocompletion listing due to a bug in Roslyn, although it compiles and runs correctly. See for details.

    Here is how I've defined Blog and Posts in my EF Core 2 project in Visual Studio:
    public class BloggingContext : DbContext
        public DbSet<Blog> Blog { get; set; }
        public DbSet<Post> Posts { get; set; }
        protected override void OnConfiguring (DbContextOptionsBuilder optionsBuilder)
            optionsBuilder.UseSqlServer (@"Server=.;Database=BlogTest;Trusted_Connection=True;");
            optionsBuilder.EnableSensitiveDataLogging ();
    public class Blog
        public int BlogId { get; set; }
        public string Url { get; set; }
        public virtual List<Post> Posts { get; set; }
    public class Post
        public int PostId { get; set; }
        public string Title { get; set; }
        public string Content { get; set; }
        public int BlogId { get; set; }
        public virtual Blog Blog { get; set; }
    Can you try the same?
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