Class with IComparable and IComparer : IComparer : Data Structure C# Examples

    
using  System;
using  System.Collections;

public  class  MainClass
{
    public  static  int  Main(string[]  args)
    {
        Employee[]  empList  =  new  Employee[5];

        empList[0]  =  new  Employee(123,  "R");
        empList[1]  =  new  Employee(6,  "M");
        empList[2]  =  new  Employee(6,  "V");
        empList[3]  =  new  Employee(13,  "N");
        empList[4]  =  new  Employee(6,  "C");

        if(empList[0]  <  empList[4])
            Console.WriteLine("empList[0]  <  empList[4]");
        else
            Console.WriteLine("empList[0]  >=  empList[4]");
    
        return  0;
    }
}
public  class  Employee  :  IComparable
{
    private  class  SortByEmployeemNameHelper  :  IComparer
    {
        public  SortByEmployeemNameHelper(){}
        int  IComparer.Compare(object  o1,  object  o2)
        {
            Employee  t1  =  (Employee)o1;
            Employee  t2  =  (Employee)o2;
            return  String.Compare(t1.EmployeemName,  t2.EmployeemName);
        }
    }

    private  int  EmployeeID;
    private  string  petName;

    //  properties.
    public  int  ID
    {
        get{return  EmployeeID;}
        set{EmployeeID  =  value;}
    }
    public  string  EmployeemName
    {
        get{return  petName;}
        set{petName  =  value;}
    }

    //  Constructor  set.
    public  Employee(){}
    public  Employee(int  id,  string  name){  
            this.EmployeeID  =  id;  
            this.petName  =  name;
    }

    //  IComparable  implementation.
    int  IComparable.CompareTo(object  o)
    {
        Employee  temp  =  (Employee)o;
        if(this.EmployeeID  >  temp.EmployeeID)
            return  1;
        if(this.EmployeeID  <  temp.EmployeeID)
            return  -1;
        else
            return  0;
    }

    //  Property  to  return  the  SortByEmployeemName  comparer.
    public  static  IComparer  SortByEmployeemName{  
            get  {  return  (IComparer)new  SortByEmployeemNameHelper();  }  
    }

    public  static  bool  operator  <  (Employee  c1,  Employee  c2)
    {
        IComparable  itfComp  =  (IComparable)c1;
        return  (itfComp.CompareTo(c2)  <  0);
    }

    public  static  bool  operator  >  (Employee  c1,  Employee  c2)
    {
        IComparable  itfComp  =  (IComparable)c1;
        return  (itfComp.CompareTo(c2)  >  0);
    }

    public  static  bool  operator  <=  (Employee  c1,  Employee  c2)
    {
        IComparable  itfComp  =  (IComparable)c1;
        return  (itfComp.CompareTo(c2)  <=  0);
    }

    public  static  bool  operator  >=  (Employee  c1,  Employee  c2)
    {
        IComparable  itfComp  =  (IComparable)c1;
        return  (itfComp.CompareTo(c2)  >=  0);
    }
}