Add Method Does Not Exist

MeTP · January 6th, 2015, 06:34 PM

I've been encountering this in the examples throughout the book. On page 569 (Chapter 15) and elsewhere we are instructed to call an Add method which (when we build the project) always produces an error because it doesn't exist. Is there a correction available for this (I didn't see anything in errata). Thanks!

Code:

            if(_id == -1) // Insert new item
            {
                myReview = new Review();
                myReview.CreateDateTime = DateTime.Now;
                myReview.UpdateDateTime = myReview.CreateDateTime;
                myEntities.Reviews.Add(myReview);
            }

This is the error I receive when I build the project:

Error 1 'System.Data.Objects.ObjectSet<PlanetWroxModel.Rev iew>' does not contain a definition for 'Add' and no extension method 'Add' accepting a first argument of type 'System.Data.Objects.ObjectSet<PlanetWroxModel.Rev iew>' could be found (are you missing a using directive or an assembly reference?) C:\BegAPSNET\Site\Management\AddEditReviewHandCode d.aspx.cs 60 36 Site

MeTP · January 7th, 2015, 01:22 AM

The downloaded code sample has already fixed this problem. Should have checked there first.

Code:

      if (_id == -1) // Insert new item
      {
        myReview = new Review();
        myReview.CreateDateTime = DateTime.Now;
        myReview.UpdateDateTime = myReview.CreateDateTime;
        myEntities.AddToReviews(myReview);
      }

Imar · January 7th, 2015, 04:49 AM

Hi there,

It's not an error in the book. It looks you're using a mix of versions of the book and Visual Studio. Entity Framework changed quite a bit between versions where something like this

myEntities.AddToReviews(myReview);

has changed to this:

myEntities.Reviews.Add(myReview);

So, I think you're using either an older version of Visual Studio or EF than the book assumes.

Cheers,

Imar