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ListDictionary.Count Property

Gets the number of key-and-value pairs contained in the ListDictionary.

[Visual Basic]
Public Overridable ReadOnly Property Count As Integer  Implements _
   ICollection.Count
[C#]
public virtual int Count {get;}
[C++]
public: __property virtual int get_Count();
[JScript]
public function get Count() : int;

Property Value

The number of key-and-value pairs contained in the ListDictionary.

Implements

ICollection.Count

Remarks

This is an O(1) operation.

Example

[Visual Basic, C#, C++] The following code example enumerates the elements of a ListDictionary.

[Visual Basic] 
Imports System
Imports System.Collections
Imports System.Collections.Specialized

Public Class SamplesListDictionary   

   Public Shared Sub Main()

      ' Creates and initializes a new ListDictionary.
      Dim myCol As New ListDictionary()
      myCol.Add("Braeburn Apples", "1.49")
      myCol.Add("Fuji Apples", "1.29")
      myCol.Add("Gala Apples", "1.49")
      myCol.Add("Golden Delicious Apples", "1.29")
      myCol.Add("Granny Smith Apples", "0.89")
      myCol.Add("Red Delicious Apples", "0.99")

      ' Displays the values in the ListDictionary in three different ways.
      Console.WriteLine("Displays the elements using for each:")
      PrintKeysAndValues(myCol)
      Console.WriteLine("Displays the elements using the IDictionaryEnumerator:")
      PrintKeysAndValues2(myCol)
      Console.WriteLine("Displays the elements using the Keys, Values, Count, and indexer properties:")
      PrintKeysAndValues3(myCol)

   End Sub 'Main

   Public Shared Sub PrintKeysAndValues(myCol As IDictionary)

      Console.WriteLine("   KEY                       VALUE")
      Dim de As DictionaryEntry
      For Each de In  myCol
         Console.WriteLine("   {0,-25} {1}", de.Key, de.Value)
      Next de
      Console.WriteLine()

   End Sub 'PrintKeysAndValues

   Public Shared Sub PrintKeysAndValues2(myCol As IDictionary)
      Dim myEnumerator As IDictionaryEnumerator = myCol.GetEnumerator()

      Console.WriteLine("   KEY                       VALUE")
      While myEnumerator.MoveNext()
         Console.WriteLine("   {0,-25} {1}", myEnumerator.Key, myEnumerator.Value)
      End While
      Console.WriteLine()

   End Sub 'PrintKeysAndValues2

   Public Shared Sub PrintKeysAndValues3(myCol As ListDictionary)
      Dim myKeys(myCol.Count) As [String]
      myCol.Keys.CopyTo(myKeys, 0)

      Console.WriteLine("   INDEX KEY                       VALUE")
      Dim i As Integer
      For i = 0 To myCol.Count - 1
         Console.WriteLine("   {0,-5} {1,-25} {2}", i, myKeys(i), myCol(myKeys(i)))
      Next i
      Console.WriteLine()

   End Sub 'PrintKeysAndValues3

End Class 'SamplesListDictionary 


'This code produces the following output.
'
'Displays the elements using for each:
'   KEY                       VALUE
'   Braeburn Apples           1.49
'   Fuji Apples               1.29
'   Gala Apples               1.49
'   Golden Delicious Apples   1.29
'   Granny Smith Apples       0.89
'   Red Delicious Apples      0.99
'
'Displays the elements using the IDictionaryEnumerator:
'   KEY                       VALUE
'   Braeburn Apples           1.49
'   Fuji Apples               1.29
'   Gala Apples               1.49
'   Golden Delicious Apples   1.29
'   Granny Smith Apples       0.89
'   Red Delicious Apples      0.99
'
'Displays the elements using the Keys, Values, Count, and indexer properties:
'   INDEX KEY                       VALUE
'   0     Braeburn Apples           1.49
'   1     Fuji Apples               1.29
'   2     Gala Apples               1.49
'   3     Golden Delicious Apples   1.29
'   4     Granny Smith Apples       0.89
'   5     Red Delicious Apples      0.99


[C#] 
using System;
using System.Collections;
using System.Collections.Specialized;

public class SamplesListDictionary  {

   public static void Main()  {

      // Creates and initializes a new ListDictionary.
      ListDictionary myCol = new ListDictionary();
      myCol.Add( "Braeburn Apples", "1.49" );
      myCol.Add( "Fuji Apples", "1.29" );
      myCol.Add( "Gala Apples", "1.49" );
      myCol.Add( "Golden Delicious Apples", "1.29" );
      myCol.Add( "Granny Smith Apples", "0.89" );
      myCol.Add( "Red Delicious Apples", "0.99" );

      // Displays the values in the ListDictionary in three different ways.
      Console.WriteLine( "Displays the elements using foreach:" );
      PrintKeysAndValues( myCol );
      Console.WriteLine( "Displays the elements using the IDictionaryEnumerator:" );
      PrintKeysAndValues2( myCol );
      Console.WriteLine( "Displays the elements using the Keys, Values, Count, and indexer properties:" );
      PrintKeysAndValues3( myCol );

   }

   public static void PrintKeysAndValues( IDictionary myCol )  {
      Console.WriteLine( "   KEY                       VALUE" );
      foreach ( DictionaryEntry de in myCol )
         Console.WriteLine( "   {0,-25} {1}", de.Key, de.Value );
      Console.WriteLine();
   }

   public static void PrintKeysAndValues2( IDictionary myCol )  {
      IDictionaryEnumerator myEnumerator = myCol.GetEnumerator();
      Console.WriteLine( "   KEY                       VALUE" );
      while ( myEnumerator.MoveNext() )
         Console.WriteLine( "   {0,-25} {1}", myEnumerator.Key, myEnumerator.Value );
      Console.WriteLine();
   }

   public static void PrintKeysAndValues3( ListDictionary myCol )  {
      String[] myKeys = new String[myCol.Count];
      myCol.Keys.CopyTo( myKeys, 0 );

      Console.WriteLine( "   INDEX KEY                       VALUE" );
      for ( int i = 0; i < myCol.Count; i++ )
         Console.WriteLine( "   {0,-5} {1,-25} {2}", i, myKeys[i], myCol[myKeys[i]] );
      Console.WriteLine();
   }

}

/*
This code produces the following output.

Displays the elements using foreach:
   KEY                       VALUE
   Braeburn Apples           1.49
   Fuji Apples               1.29
   Gala Apples               1.49
   Golden Delicious Apples   1.29
   Granny Smith Apples       0.89
   Red Delicious Apples      0.99

Displays the elements using the IDictionaryEnumerator:
   KEY                       VALUE
   Braeburn Apples           1.49
   Fuji Apples               1.29
   Gala Apples               1.49
   Golden Delicious Apples   1.29
   Granny Smith Apples       0.89
   Red Delicious Apples      0.99

Displays the elements using the Keys, Values, Count, and indexer properties:
   INDEX KEY                       VALUE
   0     Braeburn Apples           1.49
   1     Fuji Apples               1.29
   2     Gala Apples               1.49
   3     Golden Delicious Apples   1.29
   4     Granny Smith Apples       0.89
   5     Red Delicious Apples      0.99

*/


[C++] 
#using <mscorlib.dll>
#using <System.dll>
using namespace System;
using namespace System::Collections;
using namespace System::Collections::Specialized;

void PrintKeysAndValues( IDictionary* myCol )  {
    Console::WriteLine( S"   KEY                       VALUE" );
    IEnumerator* myEnum = myCol->GetEnumerator();
    while (myEnum->MoveNext())
    {
        DictionaryEntry de = *__try_cast<DictionaryEntry*>(myEnum->Current);
        Console::WriteLine( S"   {0,-25} {1}", de.Key, de.Value );
    }
    Console::WriteLine();
}

void PrintKeysAndValues2( IDictionary* myCol )  {
    IDictionaryEnumerator* myEnumerator = myCol->GetEnumerator();
    Console::WriteLine( S"   KEY                       VALUE" );
    while ( myEnumerator->MoveNext() )
        Console::WriteLine( S"   {0,-25} {1}", myEnumerator->Key, myEnumerator->Value );
    Console::WriteLine();
}

void PrintKeysAndValues3( ListDictionary* myCol )  {
    String* myKeys[] = new String*[myCol->Count];
    myCol->Keys->CopyTo( myKeys, 0 );

    Console::WriteLine( S"   INDEX KEY                       VALUE" );
    for ( int i = 0; i < myCol->Count; i++ )
        Console::WriteLine( S"   {0,-5} {1,-25} {2}", __box(i), myKeys->Item[i], myCol->Item[myKeys[i]] );
    Console::WriteLine();
}

int main()  {

    // Creates and initializes a new ListDictionary.
    ListDictionary* myCol = new ListDictionary();
    myCol->Add( S"Braeburn Apples", S"1.49" );
    myCol->Add( S"Fuji Apples", S"1.29" );
    myCol->Add( S"Gala Apples", S"1.49" );
    myCol->Add( S"Golden Delicious Apples", S"1.29" );
    myCol->Add( S"Granny Smith Apples", S"0.89" );
    myCol->Add( S"Red Delicious Apples", S"0.99" );

    // Displays the values in the ListDictionary in three different ways.
    Console::WriteLine( S"Displays the elements using foreach:" );
    PrintKeysAndValues( myCol );
    Console::WriteLine( S"Displays the elements using the IDictionaryEnumerator:" );
    PrintKeysAndValues2( myCol );
    Console::WriteLine( S"Displays the elements using the Keys, Values, Count, and indexer properties:" );
    PrintKeysAndValues3( myCol );

}

/*
This code produces the following output.

Displays the elements using foreach:
   KEY                       VALUE
   Braeburn Apples           1.49
   Fuji Apples               1.29
   Gala Apples               1.49
   Golden Delicious Apples   1.29
   Granny Smith Apples       0.89
   Red Delicious Apples      0.99

Displays the elements using the IDictionaryEnumerator:
   KEY                       VALUE
   Braeburn Apples           1.49
   Fuji Apples               1.29
   Gala Apples               1.49
   Golden Delicious Apples   1.29
   Granny Smith Apples       0.89
   Red Delicious Apples      0.99

Displays the elements using the Keys, Values, Count, and indexer properties:
   INDEX KEY                       VALUE
   0     Braeburn Apples           1.49
   1     Fuji Apples               1.29
   2     Gala Apples               1.49
   3     Golden Delicious Apples   1.29
   4     Granny Smith Apples       0.89
   5     Red Delicious Apples      0.99

*/

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button Language Filter in the upper-left corner of the page.

Requirements

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, .NET Compact Framework

See Also

ListDictionary Class | ListDictionary Members | System.Collections.Specialized Namespace

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