Question

I have a custom class called “game”. Say I create 3 instances of this class.

Public Class FrmMain
  Public Sub addGames()
    for x As Integer = 1 To 3 Step 1
      Dim game As New game
      if x = 1 then game.name = "Zelda"
      if x = 2 then game.name = "Mario"
      if x = 3 then game.name = "Donkey Kong"
    next
  End Sub

  Public Sub findMario()
    'What goes here?
  End Sub
End Class

What do I put in my sub “findMario()” to get the instance of “game” the name property equal to “Mario”?

Answer 1

You can do something like this:

Public Class FrmMain
    Dim games as new List(of game)

    Public Sub addGames()
        games.Add(New Game With {.Name = "Zelda"})
        games.Add(New Game With {.Name = "Mario"})
        games.Add(New Game With {.Name = "Donkey Kong"})
    End Sub

    Public Sub findMario()
        Dim result = (From game In games
                     Where game.Name.Equals("Mario")
                     Select game).FirstOrDefault

        'Do something with the result
    End Sub
End Class

If you need to retrieve the game names from an external text file you could do something like this:

Public Sub addGames()
    Dim names = File.ReadAllLines("C:\games.txt")        

    names.ToList().ForEach(Sub(x) games.Add(New Game With {.Name = x}))
End Sub