Csharp/C Sharp/Collections Data Structure/ReadOnlyCollection — различия между версиями
Admin (обсуждение | вклад) м (1 версия) |
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(нет различий)
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Версия 18:31, 26 мая 2010
Use ReadOnlyCollection to wrap a collection
<source lang="csharp"> using System; using System.Collections.ObjectModel; using System.Collections.Generic; using System.Text; using System.Runtime.Serialization;
public class Customer : System.IComparable {
private int _id; private string _name; private string _rating; private static SortOrder _order; public enum SortOrder { Ascending = 0, Descending = 1 } public Customer(int id, string name) : this(id, name, "Other") { } public Customer(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) { Customer custObj = (Customer)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.rupareTo(((Customer)obj).Name); case SortOrder.Descending: return (((Customer)obj).Name).rupareTo(this.Name); default: return this.Name.rupareTo(((Customer)obj).Name); } }
} class Program {
public static void Main(){ List<Customer> collCustList = new List<Customer>(); collCustList.Add(new Customer(99, "H", "P")); collCustList.Add(new Customer(77, "B", "G")); collCustList.Add(new Customer(55, "B", "G")); collCustList.Add(new Customer(88, "B", "P")); collCustList.Add(new Customer(11, "L", "O")); ReadOnlyCollection<Customer> roCustColl = new ReadOnlyCollection<Customer>(collCustList); Customer tmpCust = roCustColl[1]; tmpCust.Name = "NAME CHANGED"; foreach (Customer cust in roCustColl) Console.Out.WriteLine(cust); }
}
</source>