Question

I’m writing an update method that passes in a list of objects to be updated, I’m wondering how I would write a LINQ query to grab all the objects from the database that need to be updated

This is an example of my update method with the linq query that I’m trying to make (pseudo-code used for the part I don’t know how to do)

void UpdateObjects(List<MyObjects> updatedObjects)
{

    DatabaseContext myContext = new DatabaseContext();

    var originalObjectsThatRequireUpdating = from o in myContext.MyObjects
                                             where o.ID matches one of updatedObjects.ID
                                             select o;


    foreach (var originalObject in originalObjectsThatRequireUpdating )
    {
         IEnumerable<MyObjects> tmpItem = updatedObjects.Where(i => i.ID == originalObject.ID);

         originalObject.Field1 = tmpItem.ToList()[0].Field1;
         //copy rest of the fields like this
    }

    myContext.SubmitChanges();

}

I don’t know how to create a linq query easily with something like

 where o.ID matches one of updatedObjects.ID

also if someone knows an easier way to accomplish what I’m doing please tell, this seems sort of like an odd way to do it, but was the only way I can think of / know how to do at this point.

Answer 1

you can do that with:

where updatedObjects.Any(uo => uo.ID == o.ID)