What does DbContext's version of ObjectContext.ApplyCurrentValues look like?
There is no analogous thing. You may get the ObjectContext either by...
...or use a similar technique of
depicts the thing as it was before the alteration (usually fetched from database before you update). It must be related to the situation.
indicates the object that has changed that has the same key.
This second strategy is most likely strongly connected to the
technique of EF 4.0.