Updating existing data in EF 6 throws exception - “…entity of the same type already has the same primary key value.”

Question

I am trying to update a record using Entity Framework 6, code-first, no fluent mapping or a tool like Automapper.

The entity(Employee) has other composi

Answer 1

This worked for myself

var aExists = _db.Model.Find(newOrOldOne.id);
if(aExists==null)
{
    _db.Model.Add(newOrOldOne);
}
else
{
    _db.Entry(aExists).State = EntityState.Detached;
    _db.Entry(newOrOldOne).State = EntityState.Modified;
}