LINQ Select distinct from a List?

Question

I have the following list:

    class Person
    {
        public String Name { get; set; }
        public String LastName { get; set; }
        public Stri         


        

Answer 1

In addition to Darin Dimitrov's answer, here is the same in query syntax:

var groupByCityQuery = from person in personList 
                       group person by person.City into grouping 
                       select grouping;

Answer 2

Judging by this comment: No, I wan't a list containing all the Persons that contains 1 as a city and another that contains 2 as a city...

We can do something like this:

var city1People = personList.Where(x => x.city == "1").ToList();
var city2People = personList.Where(x => x.city == "2").ToList();

if this is something more dynamic, like you're going to have N cities and want an individual list of people per city, you're going to need to return a collection of lists.

Answer 3

You could use LINQ to group the persons list by city:

var groupedPersons = personList.GroupBy(x => x.City);
foreach (var g in groupedPersons)
{
    string city = g.Key;
    Console.WriteLine(city);
    foreach (var person in g)
    {
        Console.WriteLine("{0} {1}", person.Name, person.LastName);
    }
}