Question

Its a simple question, but I’m not aware of the answer and I couldn’t get it to work.

Can I update only one entity on the entire DataContext? Or should I follow plain ADO.NET for this operation only?

Edit:

public MyObject GetMyObjectById(int selectedId)
    {
        DataContext db = _dbManager.GetContext();

        return db.MyObject.SingleOrDefault(p => p.Id == selectedId);
    }

I am getting an object with the above query…
I am querying then for an integer…on another table/object

 public int GetMyInteger()
    {
        DataContext db = _dbManager.GetContext();

        return db.MyAnotherObject.FirstOrDefault().MyInteger;
    }

Everything is fine for all my operations…but now i just want to update only the integer i got from the database…

 public void SetMyInteger(int updInteger)
    {
        DataContext db = new DataContext(ConnectionString);

        MyAnotherObject theEntity = db.MyAnotherObject.FirstOrDefault();
        atheEntity.MyInteger = updInteger;
        db.SubmitChanges(ConflictMode.ContinueOnConflict);
    }

The above method deleted MyObject i got from the first query!!! Of course if i use the static context DataContext tries to update MyObject and MyAnotherObject which seems the correct behaviour.

Edit:

I have changed the method getting the integer with a new datacontext as well and seems to working correctly, i have a strange thought on why called the delete method, because it was the method that was called, but again .. is working now…

Thank you all for your time.

Answer 1

Yes it’s possible. What have you tried? It should be as simple as this:

using (var dc = new YourDataContext())
{
    Person p = dc.Persons.Take(1).Single();
    p.FirstName = "Ahmad";
    dc.SubmitChanges();
}