Last Inserted Auto Increment Id using ASP.NET MVC & Entity Framework

Question

Here I'm going to get last inserted auto-increment ID for the Newstbl . But here in the normal scenario we can take it as order by DESCENDING ORDER & get the first record.

But here I use ASP.NET MVC & Entity Framework, I'm stuck there. NewsId is the auto-increment Id

My code:

public int GetLastInsertedId()
{
        return (from x in context.Newstbl
                orderby x.NewsId 'DESC' 
                select x)
}

Answer 1

IF you've properly set up your EF mapping, then basically when you insert a new NewsTbl object, the auto-incremented ID should be available as soon as you've called .SaveChanges() on your context.

So if you do this:

using(YourEFContext ctx = new YourEFContext())
{
    NewsTbl news = new NewsTbl();

    // set some properties here on "news".....

    ctx.NewsTbl.Add(news);

    ctx.SaveChanges();
}

then after the call to .SaveChanges() , your news object should actually already contain the auto-incremented ID property.... so I don't really understand why you're going through all this trouble of trying to read out the last inserted auto-increment ID - it's already there for you, in your object.

Answer 2

you can get this way using Linq Method Query syntax:

public int GetLastInsertedId()
{
   return context.Newstbl.OrderByDescending(x=>x.NewsId).First().NewsId;

}

and using query expression syntax:

public int GetLastInsertedId()
{
  return (from x in context.Newstbl 
          select x).OrderByDescending(x=>x.NewsId).First().NewsId;
}