Csharp/CSharp Tutorial/Data Structure/ReadOnlyCollectionBase

extends ReadOnlyCollectionBase

<source lang="csharp">using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data;

 public class MainClass
 {
   static void Main() 
   {
         Customers customers = new Customers();
         foreach(Customer c in customers)
         {
           System.Console.WriteLine(c.Name + ", " + c.Phone);
         }
       }
 }
 
 public class Customers : ReadOnlyCollectionBase
 {
       public Customers()
       {
         ReadCustomers();
       }
   
       public Customer this[int index]
       {
         get
         {
           return (Customer)InnerList[index];
         }
       }
       
       
       public Customer this[string name]
       {
         get
         {
           return (Customer)this[Find(name)];
         }
       }
       
       private int Find(string name)
       {
         for( int i = 0; i < Count - 1; i++)
         {
           if( this[i].Name.Equals(name) ) return i;
         }
         return -1;
       }
       
       private void ReadCustomers()
       {
         InnerList.Add( new Customer("A", "(666) 555-1212"));
         InnerList.Add( new Customer("M", "(503) 555-1212"));
       }
     }
     
     public class Customer
     {
      
           public Customer(string name, string phone)
           {
             this.Name = name;
             this.Phone = phone;
           }    
     
       public string Name;
       
       public string Phone;
      }</source>