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Let's suppose that we have a class like: class Person { internal int PersonID; internal string car; } I have a list of this class: List<Person> persons; And this list can have multiple instances with the same PersonID s, for example: persons[0] = new Person { PersonID = 1, car = "Ferrari" }; persons[1] = new Person { PersonID = 1, car = "BMW" }; persons[2] = new Person { PersonID = 2, car = "Audi" }; Is there a way I can group by PersonID and get the list of all the cars he has? For example, the expected result would be class Result { int PersonID; List<string> cars; } So after grouping, I would get: results[0].PersonID = 1; List<string> cars = results[0].cars; result[1].PersonID = 2; List<string> cars = result[1].cars; From what I have done so far: var results = from p in persons group p by p.PersonID into g select new { PersonID = g.Key, // this is where I am not sure what to do Could someone please point me in the right direction?
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