using System; using System.Collections.ObjectModel; using System.Collections.Generic; using System.Text; using System.Runtime.Serialization; public class Employee : System.IComparable { private int _id; private string _name; private string _rating; private static SortOrder _order; public enum SortOrder { Ascending = 0, Descending = 1 } public Employee(int id, string name) : this(id, name, "Other") { } public Employee(int id, string name, string rating) { this._id = id; this._name = name; this._rating = rating; } public int Id { get { return this._id; } set { this._id = value; } } public string Name { get { return this._name; } set { this._name = value; } } public string Rating { get { return this._rating; } set { this._rating = value; } } public static SortOrder Order { get { return _order; } set { _order = value; } } public override bool Equals(Object obj) { bool retVal = false; if (obj != null) { Employee custObj = (Employee)obj; if ((custObj.Id == this.Id) && (custObj.Name.Equals(this.Name) && (custObj.Rating.Equals(this.Rating)))) retVal = true; } return retVal; } public override string ToString() { return this._id + ": " + this._name; } public int CompareTo(Object obj) { switch (_order) { case SortOrder.Ascending: return this.Name.CompareTo(((Employee)obj).Name); case SortOrder.Descending: return (((Employee)obj).Name).CompareTo(this.Name); default: return this.Name.CompareTo(((Employee)obj).Name); } } } public class CollectionTest { public static void Main() { List<Employee> collCustList = new List<Employee>(); collCustList.Add(new Employee(99, "H", "P")); collCustList.Add(new Employee(77, "B", "G")); collCustList.Add(new Employee(55, "B", "G")); collCustList.Add(new Employee(88, "B", "P")); collCustList.Add(new Employee(11, "L", "O")); foreach (Employee cust in collCustList) Console.Out.WriteLine(cust); Employee.Order = Employee.SortOrder.Ascending; collCustList.Sort(delegate(Employee cust1, Employee cust2) { return Comparer<Employee>.Default.Compare(cust1, cust2); }); foreach (Employee cust in collCustList) Console.Out.WriteLine(cust); Employee.Order = Employee.SortOrder.Descending; collCustList.Sort(delegate(Employee cust1, Employee cust2) { return Comparer<Employee>.Default.Compare(cust1, cust2); }); foreach (Employee cust in collCustList) Console.Out.WriteLine(cust); } }