C# in a Nutshell, Second Edition

Name

DictionaryBase

Synopsis

This abstract base class is used to implement specialized dictionary style collections. Classes derived from DictionaryBase allow for strongly typed key and value pairs. A set of protected instance methods is defined to be overridden by derived classes. These methods allow a class to specify customized processes when functions are performed on the derived object. For example, OnSet( ) lets you perform a function before you set a new element in the dictionary, while OnSetComplete( ) lets you perform a function after a value is set.

public abstract class DictionaryBase : IDictionary, ICollection, IEnumerable {
// Protected Constructors
   protected DictionaryBase( );
// Public Instance Properties
   public int Count{get; }
// implements ICollection
                  // Protected Instance Properties
   protected IDictionary Dictionary{get; }
   protected Hashtable InnerHashtable{get; }
// Public Instance Methods
   public void Clear( );   
// implements IDictionary
   public void CopyTo(Array array, int index);       
// implements ICollection
   public IDictionaryEnumerator GetEnumerator( );      
// implements IDictionary
                  // Protected Instance Methods
   protected virtual void OnClear( );
   protected virtual void OnClearComplete( );
   protected virtual object OnGet(object key, object currentValue);
   protected virtual void OnInsert(object key, object value);
   protected virtual void OnInsertComplete(object key, object value);
   protected virtual void OnRemove(object key, object value);
   protected virtual void OnRemoveComplete ...