Use IComparer : IComparer « Data Structure « C# / CSharp Tutorial

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C# / CSharp Tutorial » Data Structure » IComparer 
11.42.1.Use IComparer
using System; 
using System.Collections; 
 
// Create an IComparer for Product objects. 
class ProductComparer : IComparer 
  // Implement the IComparable interface. 
  public int Compare(object obj1, object obj2) { 
    Product a, b; 
    a = (Productobj1; 
    b = (Productobj2; 
    return a.name.CompareTo(b.name)
  

 
class Product 
  public string name; 
  double cost; 
  int onhand; 
 
  public Product(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)
  

 
class IComparerDemo 
  public static void Main() { 
    ProductComparer comp = new ProductComparer()
    ArrayList inv = new ArrayList()
     
    // Add elements to the list 
    inv.Add(new Product("A"5.53))
    inv.Add(new Product("B"8.92));    
    inv.Add(new Product("C"3.04))
    inv.Add(new Product("D"1.88))
 
    Console.WriteLine("Product list before sorting:")
    foreach(Product i in inv) { 
      Console.WriteLine("   " + i)
    
    Console.WriteLine()
 
    // Sort the list using an IComparer. 
    inv.Sort(comp)
 
    Console.WriteLine("Product list after sorting:")
    foreach(Product i in inv) { 
      Console.WriteLine("   " + i)
    
  
}
Product list before sorting:
   A         Cost:  $5.50  On hand: 3
   B         Cost:  $8.90  On hand: 2
   C         Cost:  $3.00  On hand: 4
   D         Cost:  $1.80  On hand: 8

Product list after sorting:
   A         Cost:  $5.50  On hand: 3
   B         Cost:  $8.90  On hand: 2
   C         Cost:  $3.00  On hand: 4
   D         Cost:  $1.80  On hand: 8
11.42.IComparer
11.42.1.Use IComparer
11.42.2.IComparer as a Property
11.42.3.Class with IComparable and IComparer
11.42.4.Implement IComparer to do the customized sorting
11.42.5.Sort and IComparer<(Of <(TKey>)>)),
11.42.6.Sort an Array using the default comparer and a custom comparer that reverses the sort order
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