linq to sql无法访问已处置的对象。 返回一个新创建的对象

Question

I am simply creating a new object that has one to on relationship. A comment to a User relation. When I try to retrieve the new object I get the error Cannot access a disposed object. I am not sure what is going on. Thanks for any help or suggestions.

     using (var db = new LinqEntityDataContext())
            {

                var comment = new Comment();
                comment.CommentBy = GlobalVariables.User.ID;
                comment.OutPutMessage = commentText.Trim();
                comment.PhotoID = int.Parse(pictureID);
                comment.CommentDate = DateTime.Now;
                db.Comments.InsertOnSubmit(comment);
                db.SubmitChanges();
                return comment;
            }

Answer 1

You need to set the return comment; after the last bracket.

You are finishing the function just before the Dispose, that's why you get the Exception

Something like this.

 var comment = new Comment();
 using (var db = new LinqEntityDataContext())
            {               
                comment.CommentBy = GlobalVariables.User.ID;
                comment.OutPutMessage = commentText.Trim();
                comment.PhotoID = int.Parse(pictureID);
                comment.CommentDate = DateTime.Now;
                db.Comments.InsertOnSubmit(comment);
                db.SubmitChanges();              
            }
  return comment;

Answer 2

So to understanding I guess with Linq to SQL you have to make two calls one to insert than another to get the data with the association. So In my code I just have two using statements the second one just calling to get the object of the id created (seems redundant to me). I hope that someone can post or direct this posting to a real solution.