Whether NameObjectCollectionBase contains entries whose keys are not null. : NameObjectCollectionBase « Collections Data Structure « C# / C Sharp

1. C# / C Sharp
2. Collections Data Structure
3. NameObjectCollectionBase

Whether NameObjectCollectionBase contains entries whose keys are not null.

 

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()  {
   }
   public void Add( String key, Object value )  {
      this.BaseAdd( key, value );
   }
   public Boolean HasKeys  {
      get  {
         return( this.BaseHasKeys() );
      }
   }

}

public class SamplesNameObjectCollectionBase  {
   public static void Main()  {
      MyCollection myCol = new MyCollection();
      Console.WriteLine( "Initial state of the collection (Count = {0}):", myCol.Count );
      PrintKeysAndValues( myCol );
      Console.WriteLine( "HasKeys? {0}", myCol.HasKeys );
      myCol.Add( "blue", "sky" );
      Console.WriteLine( "Initial state of the collection (Count = {0}):", myCol.Count );
      PrintKeysAndValues( myCol );
      Console.WriteLine( "HasKeys? {0}", myCol.HasKeys );
   }

   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 );
      }
   }
}

   
  

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