C# 0 The Complete Reference

IComparable

.

Notice it uses the generic 

List

 collection rather than the non-generic 

ArrayList

.

// Implement IComparable.

using System;

using System.Collections.Generic;

// Implement the generic IComparable interface.

class Inventory : IComparable {

  string name;

  double cost;

  int onhand;

  public Inventory(string n, double c, int h) {

    name = n;

    cost = c;

    onhand = h;

  }

  public override string ToString() {

    return

      String.Format("{0,-10}Cost: {1,6:C}  On hand: {2}",

                    name, cost, onhand);

  }

  // Implement the IComparable interface.

  public int CompareTo(Inventory obj) {

    return name.CompareTo(obj.name);

  }

}

class GenericIComparableDemo {

  static void Main() {

    List inv = new List();

    // Add elements to the list.

    inv.Add(new Inventory("Pliers", 5.95, 3));

    inv.Add(new Inventory("Wrenches", 8.29, 2));

    inv.Add(new Inventory("Hammers", 3.50, 4));

    inv.Add(new Inventory("Drills", 19.88, 8));

    Console.WriteLine("Inventory list before sorting:");

    foreach(Inventory i in inv) {

      Console.WriteLine("   " + i);

    }

    Console.WriteLine();

    // Sort the list.

    inv.Sort();

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