This base interface for a collection of key/value elements defines the indexer (in C#, the this property; in VB.NET, the property marked as Default ), as well as the Keys and Values properties that return collections containing the dictionary's keys or values, respectively. This interface also defines the methods by which the entries may be modified, such as Add( ) , Clear( ) , and Remove( ) . public interface IDictionary : ICollection, IEnumerable { // Public Instance Properties public bool IsFixedSize {get; } public bool IsReadOnly {get; } public ICollection Keys {get; } public object this [object key ]{set; get; } public ICollection Values {get; } // Public Instance Methods public void Add (object key , object value ); public void Clear ( ); public bool Contains (object key ); public IDictionaryEnumerator GetEnumerator ( ); public void Remove (object key ); } Implemented ByDictionaryBase , Hashtable , SortedList , System.Collections.Specialized.{HybridDictionary , ListDictionary} Returned ByDictionaryBase.Dictionary , System.Environment.GetEnvironmentVariables( ) Passed ToHashtable.Hashtable( ) , SortedList.SortedList( ) , System.Collections.Specialized.CollectionsUtil.CreateCaseInsensitiveHashtable( ) , System.Diagnostics.EventLogInstaller.{Install( ) , Rollback( ) , Uninstall( )} |