LINQ to Entities how to update a record

Question

Okay, so I'm new to both EF and LINQ. I have figured out how to INSERT and DELETE but for some reason UPDATE seems to escape my grasp.

Here is a sample of my code:

EntityDB dataBase = new EntityDB(); Customer c = new Customer {      Name = "Test",      Gender = "Male }; dataBase.Customers.AddObject(c); dataBase.SaveChanges(); 

The above creates and adds a record just fine.

Customer c = (from x in dataBase.Customers              where x.Name == "Test"              selext x).First(); dataBase.Customers.DeleteObject(c); dataBase.SaveChanges(); 

The above effectively deletes the specified record.

Now how do I update? I can't seem to find an "UpdateObject()" method on the entity collection.

Answer 1

Just modify one of the returned entities:

Customer c = (from x in dataBase.Customers              where x.Name == "Test"              select x).First(); c.Name = "New Name"; dataBase.SaveChanges(); 

Note, you can only update an entity (something that extends EntityObject, not something that you have projected using something like select new CustomObject{Name = x.Name}

Answer 2

//for update

(from x in dataBase.Customers          where x.Name == "Test"          select x).ToList().ForEach(xx => xx.Name="New Name"); 

//for delete

dataBase.Customers.RemoveAll(x=>x.Name=="Name");