Collections in C#

For many applications, you want to create and manage groups of related objects. There are two ways to group objects: by creating arrays of objects, and by creating collections of objects.

Arrays (C# Programming Guide)
https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/arrays/


Collections   (C# Programming Guide)
https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/concepts/collections

Simple collection example

// Create a list of strings. var salmons = new List<string>(); salmons.Add("chinook"); salmons.Add("coho"); salmons.Add("pink"); salmons.Add("sockeye");

// Iterate through the list. foreach (var salmon in salmons) { Console.Write(salmon + " "); } // Output: chinook coho pink sockeye

 Sample of Galaxy class that is used by the List<T> is defined in the code.

private static void IterateThroughList()

{

    var theGalaxies = new List<Galaxy>

        {

            new Galaxy() { Name="Tadpole", MegaLightYears=400},

            new Galaxy() { Name="Pinwheel", MegaLightYears=25},

            new Galaxy() { Name="Milky Way", MegaLightYears=0},

            new Galaxy() { Name="Andromeda", MegaLightYears=3}

        };

    foreach (Galaxy theGalaxy in theGalaxies)

    {

        Console.WriteLine(theGalaxy.Name + "  " + theGalaxy.MegaLightYears);

    }

    // Output:

    //  Tadpole  400

    //  Pinwheel  25

    //  Milky Way  0

    //  Andromeda  3

}

public class Galaxy

{

    public string Name { get; set; }

    public int MegaLightYears { get; set; }

}