How to join the result of one query into the result of another without selecting new instance? [duplicate]

Answer 1

Use method syntax join and explicitly open the scope of the resultSelector. In it edit the object as you want and return it.

var result = dbResults.Join(webResults, db => db.Id, web => web.Id
                            (db, web) => {
                                db.SomePropFromWeb = web.SomeProp;
                                return db;
                            });