Whether NameObjectCollectionBase is read-only.
using System; using System.Collections; using System.Collections.Specialized; public class MyCollection : NameObjectCollectionBase { private DictionaryEntry _de = new DictionaryEntry(); public DictionaryEntry this[ int index ] { get { _de.Key = this.BaseGetKey( index ); _de.Value = this.BaseGet( index ); return( _de ); } } public MyCollection( IDictionary d, Boolean bReadOnly ) { foreach ( DictionaryEntry de in d ) { this.BaseAdd( (String) de.Key, de.Value ); } this.IsReadOnly = bReadOnly; } public void Add( String key, Object value ) { this.BaseAdd( key, value ); } } public class SamplesNameObjectCollectionBase { public static void Main() { IDictionary d = new ListDictionary(); d.Add( "A", "a" ); d.Add( "B", "b" ); d.Add( "C", "c" ); MyCollection myROCol = new MyCollection( d, true ); myROCol.Add( "Q", "q" ); PrintKeysAndValues( myROCol ); } public static void PrintKeysAndValues( MyCollection myCol ) { for ( int i = 0; i < myCol.Count; i++ ) { Console.WriteLine( "[{0}] : {1}, {2}", i, myCol[i].Key, myCol[i].Value ); } } }