IndexOf List in a List

[mynugget99]

Ok lets say I have a list in a list. Say list name is players and each player contains three more items. One for id, playername, and color.

players[0][0] = 1001
players[0][1] = Bob
players[0][2] = red

players[1][0] = 1002
players[1][1] = Joe
players[1][2] = yellow

players[2][0] = 1003
players[2][1] = Tom
players[2][2] = blue

players[3][0] = 1004
players[3][1] = Bill
players[3][2] = blue

Lets say I know the players id of 1003. How do I get the first list index of 1003 which would be 2?

 

[jmcilhinney]

That's a terrible data structure to begin with. What you should be doing is defining a type with three properties to represent a player and then creating a list of instances of that type. E.g.

public class Player
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Color { get; set; }

    public Player(int id, string name, string color)
    {
        Id = id;
        Name = name;
        Color = color;
    }
}

var players = new List<Player>
              {
                  new Player(1001, "Bob", "Red"),
                  new Player(1002, "Joe", "Yellow"),
                  new Player(1003, "Tom", "Blue"),
                  new Player(1004, "Bill", "Blue")
              };

You can then find the index of the desired item using the FindIndex method of the List:

var player1003Index = players.FindIndex(p => p.Id == 1003);

If you insist using the list of lists, which is what your grandfather might have done if he write code when he was your age, then you can still use that FindIndex method:

var player1003Index = players.FindIndex(l => l[0] == 1003);