IComparer as a Property : IComparer : Data Structure C# Examples

    
using  System;
using  System.Collections;

public  class  Employee:  IComparable
{
        public  Employee(string  name,  int  id)
        {
                this.name  =  name;
                this.id  =  id;
        }
        
        int  IComparable.CompareTo(object  obj)
        {
                Employee  emp2  =  (Employee)  obj;
                if  (this.id  >  emp2.id)
                        return(1);
                if  (this.id  <  emp2.id)
                        return(-1);
                else
                        return(0);
        }
        
        public  static  IComparer  SortByName
        {
                get
                {
                        return((IComparer)  new  SortByNameClass());
                }
        }
        
        public  static  IComparer  SortById
        {
                get
                {
                        return((IComparer)  new  SortByIdClass());
                }
        }
        
        public  override  string  ToString()
        {
                return(name  +  ":"  +  id);
        }
        
        class  SortByNameClass:  IComparer
        {
                public  int  Compare(object  obj1,  object  obj2)
                {
                        Employee  emp1  =  (Employee)  obj1;
                        Employee  emp2  =  (Employee)  obj2;
                        
                        return(String.Compare(emp1.name,  emp2.name));
                }
        }
        
        class  SortByIdClass:  IComparer
        {
                public  int  Compare(object  obj1,  object  obj2)
                {
                        Employee  emp1  =  (Employee)  obj1;
                        Employee  emp2  =  (Employee)  obj2;
                        
                        return(((IComparable)  emp1).CompareTo(obj2));
                }
        }
        
        string  name;
        int  id;
}

class  MainClass
{
        public  static  void  Main()
        {
                Employee[]  arr  =  new  Employee[4];
                arr[0]  =  new  Employee("A",  1);
                arr[1]  =  new  Employee("B",  2);
                arr[2]  =  new  Employee("C",  4);
                arr[3]  =  new  Employee("D",  3);
                
                Array.Sort(arr,  Employee.SortByName);
                
                Console.WriteLine("employees  is  now  sorted  by  name");
                
                foreach  (Employee  emp  in  arr)
                      Console.WriteLine("Employee:  {0}",  emp);
                
                Array.Sort(arr,  Employee.SortById);
                
                Console.WriteLine("employees  is  now  sorted  by  id");
                
                foreach  (Employee  emp  in  arr)
                      Console.WriteLine("Employee:  {0}",  emp);
                
                ArrayList  arrList  =  new  ArrayList();
                arrList.Add(arr[0]);
                arrList.Add(arr[1]);
                arrList.Add(arr[2]);
                arrList.Add(arr[3]);
                arrList.Sort(Employee.SortByName);
                
                foreach  (Employee  emp  in  arrList)
                        Console.WriteLine("Employee:  {0}",  emp);
                
                arrList.Sort();        //  default  is  by  id
                
                foreach  (Employee  emp  in  arrList)
                        Console.WriteLine("Employee:  {0}",  emp);
        }
}