How to Retrieve Id of Inserted Entity Using Entity Framework

Get Record ID in Entity Framework after insert

This is what I'm looking for.

in partial class

protected void clientDataSource_OnInserted(object sender, EntityDataSourceChangedEventArgs e )
{

    int newPrimaryKey = ((Client)e.Entity).ClientId;
    Debug.WriteLine(" Client ID is " + newPrimaryKey);

}

and added below line in EntityDataSource in aspx page.

OnInserted="clientDataSource_OnInserted"

Get Id's of recently inserted rows in Entity Framework

EntityFrameWork(EF) after insert entity and SaveChanges(). it sets the value of Id.

Suppose that the entity you want to enter into database is as follows:

 public class EntityToInsert
  {
    public int Id { get; set; }
    public string Name { get; set; }
    public int Age { get; set; }
  }

And you want to insert a list of entity:

 var list = new List<EntityToInsert>()
        {
            new EntityToInsert() {Name = "A", Age = 15},
            new EntityToInsert() {Name = "B", Age = 25},
            new EntityToInsert() {Name = "C", Age = 35}
        };
        foreach (var item in list)
        {
            context.Set<EntityToInsert>().Add(item);
        }
        context.SaveChanges();
       // get the list of ids of the rows that are recently inserted
        var listOfIds=list.Select(x => x.Id).ToList();

I hope this helps.

Entity Framework - retrieve ID before 'SaveChanges' inside a transaction

The ID is generated by the database after the row is inserted to the table. You can't ask the database what that value is going to be before the row is inserted.

You have two ways around this - the easiest would be to call SaveChanges. Since you are inside a transaction, you can roll back in case there's a problem after you get the ID.

The second way would be not to use the database's built in IDENTITY fields, but rather implement them yourself. This can be very useful when you have a lot of bulk insert operations, but it comes with a price - it's not trivial to implement.

EDIT: SQL Server 2012 has a built-in SEQUENCE type that can be used instead of an IDENTITY column, no need to implement it yourself.

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