c# - How to merge two lists based on a property? -

i have 2 lists, 1 fake , 1 real, like:

before

// fake (list 1) { id = 1, year = 2011, x = "" } , { id = 2, year = 2012, x = "" } , { id = 3, year = 2013, x = "" }  // real (list 2) { id = 35, year = 2011, x = "information" } , { id = 77, year = 2013, x = "important" } 

i want merge them looking year, result should be:

after

{ id = 35, year = 2011, x = "information" } , { id = 2, year = 2012, x = "" } , { id = 77, year = 2013, x = "important" } 

it must remove elements same year on first list , add element equivalent year on second list first list, keeping order.

how can using linq?

you should able using "left join":

from f in fake join r in real on f.year equals r.year joinresult r in joinresult.defaultifempty() select new        {            id = r == null ? f.id : r.id,            year = f.year,            x = r == null ? f.x : r.x        };