Implementa
IDictionary mediante
ListDictionary mientras la colección es pequeña, después cambia a
Hashtable cuando la colección se hace grande.
Espacio de nombres: System.Collections.Specialized
Ensamblado: System (en system.dll)
Visual Basic (Declaración)
<SerializableAttribute> _
Public Class HybridDictionary
Implements IDictionary, ICollection, IEnumerable
Dim instance As HybridDictionary
[SerializableAttribute]
public class HybridDictionary : IDictionary, ICollection, IEnumerable
[SerializableAttribute]
public ref class HybridDictionary : IDictionary, ICollection, IEnumerable
/** @attribute SerializableAttribute() */
public class HybridDictionary implements IDictionary, ICollection,
IEnumerable
SerializableAttribute
public class HybridDictionary implements IDictionary, ICollection,
IEnumerable
Se recomienda esta clase para aquellos casos en los que se desconoce el número de elementos de un diccionario. Ésta aprovecha el rendimiento mejorado de ListDictionary con colecciones pequeñas y permite cambiar fácilmente a Hashtable, que controla colecciones grandes mejor que ListDictionary.
Si el tamaño inicial de la colección es mayor que el que puede considerarse óptimo para ListDictionary, la colección se almacena en un objeto Hashtable para evitar la sobrecarga que produce copiar elementos de ListDictionary en Hashtable.
El constructor acepta un parámetro Boolean, que permite al usuario especificar si la colección debe pasar por alto la distinción de mayúsculas y minúsculas al comparar cadenas. Si la colección diferencia entre mayúsculas y minúsculas, utiliza las implementaciones de clave de los métodos Object.GetHashCode y Object.Equals. Si la colección no distingue entre mayúsculas y minúsculas, efectúa una simple comparación ordinal sin tener en cuenta dicha distinción y sólo presta atención a las reglas de mayúsculas y minúsculas relativas a referencias culturales invariables. De forma predeterminada, la colección distingue entre mayúsculas y minúsculas. Para obtener más información acerca de la referencia cultural invariable, vea System.Globalization.CultureInfo.
Una clave no puede ser referencia de objeto null (Nothing en Visual Basic), pero un valor sí.
La instrucción foreach del lenguaje C# (for each en Visual Basic) requiere el tipo de cada elemento de la colección. Como los elementos de HybridDictionary son pares de clave y valor, el tipo del elemento no se corresponde con el tipo de la clave ni con el del valor. En su lugar, el tipo de elemento es la estructura DictionaryEntry. Por ejemplo:
foreach (DictionaryEntry de in myHybridDictionary) {...}
For Each de As DictionaryEntry In myHybridDictionary
...
Next de
La instrucción foreach es un contenedor del enumerador, que sólo permite la lectura pero no la escritura en la colección.
Nota de la plataforma Windows Mobile para Pocket PC,
Windows Mobile para Smartphone,
Windows CE:
Todas las claves agregadas a una colección HybridDictionary que no distingue entre mayúsculas y minúsculas deben disponer de valores de cadena.
En el código siguiente se muestran varios de los métodos y propiedades de la clase HybridDictionary
Imports System
Imports System.Collections
Imports System.Collections.Specialized
Public Class SamplesHybridDictionary
Public Shared Sub Main()
' Creates and initializes a new HybridDictionary.
Dim myCol As New HybridDictionary()
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")
myCol.Add("Plantain Bananas", "1.49")
myCol.Add("Yellow Bananas", "0.79")
myCol.Add("Strawberries", "3.33")
myCol.Add("Cranberries", "5.98")
myCol.Add("Navel Oranges", "1.29")
myCol.Add("Grapes", "1.99")
myCol.Add("Honeydew Melon", "0.59")
myCol.Add("Seedless Watermelon", "0.49")
myCol.Add("Pineapple", "1.49")
myCol.Add("Nectarine", "1.99")
myCol.Add("Plums", "1.69")
myCol.Add("Peaches", "1.99")
' Display the contents of the collection using For Each. This is the preferred method.
Console.WriteLine("Displays the elements using For Each:")
PrintKeysAndValues1(myCol)
' Display the contents of the collection using the enumerator.
Console.WriteLine("Displays the elements using the IDictionaryEnumerator:")
PrintKeysAndValues2(myCol)
' Display the contents of the collection using the Keys, Values, Count, and Item properties.
Console.WriteLine("Displays the elements using the Keys, Values, Count, and Item properties:")
PrintKeysAndValues3(myCol)
' Copies the HybridDictionary to an array with DictionaryEntry elements.
Dim myArr(myCol.Count) As DictionaryEntry
myCol.CopyTo(myArr, 0)
' Displays the values in the array.
Console.WriteLine("Displays the elements in the array:")
Console.WriteLine(" KEY VALUE")
Dim i As Integer
For i = 0 To myArr.Length - 1
Console.WriteLine(" {0,-25} {1}", myArr(i).Key, myArr(i).Value)
Next i
Console.WriteLine()
' Searches for a key.
If myCol.Contains("Kiwis") Then
Console.WriteLine("The collection contains the key ""Kiwis"".")
Else
Console.WriteLine("The collection does not contain the key ""Kiwis"".")
End If
Console.WriteLine()
' Deletes a key.
myCol.Remove("Plums")
Console.WriteLine("The collection contains the following elements after removing ""Plums"":")
PrintKeysAndValues1(myCol)
' Clears the entire collection.
myCol.Clear()
Console.WriteLine("The collection contains the following elements after it is cleared:")
PrintKeysAndValues1(myCol)
End Sub 'Main
' Uses the For Each statement which hides the complexity of the enumerator.
' NOTE: The For Each statement is the preferred way of enumerating the contents of a collection.
Public Shared Sub PrintKeysAndValues1(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
' Uses the enumerator.
' NOTE: The For Each statement is the preferred way of enumerating the contents of a collection.
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
' Uses the Keys, Values, Count, and Item properties.
Public Shared Sub PrintKeysAndValues3(myCol As HybridDictionary)
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 'SamplesHybridDictionary
'This code produces the following output.
'
'Displays the elements using For Each:
' KEY VALUE
' Strawberries 3.33
' Yellow Bananas 0.79
' Cranberries 5.98
' Grapes 1.99
' Granny Smith Apples 0.89
' Seedless Watermelon 0.49
' Honeydew Melon 0.59
' Red Delicious Apples 0.99
' Navel Oranges 1.29
' Fuji Apples 1.29
' Plantain Bananas 1.49
' Gala Apples 1.49
' Pineapple 1.49
' Plums 1.69
' Braeburn Apples 1.49
' Peaches 1.99
' Golden Delicious Apples 1.29
' Nectarine 1.99
'
'Displays the elements using the IDictionaryEnumerator:
' KEY VALUE
' Strawberries 3.33
' Yellow Bananas 0.79
' Cranberries 5.98
' Grapes 1.99
' Granny Smith Apples 0.89
' Seedless Watermelon 0.49
' Honeydew Melon 0.59
' Red Delicious Apples 0.99
' Navel Oranges 1.29
' Fuji Apples 1.29
' Plantain Bananas 1.49
' Gala Apples 1.49
' Pineapple 1.49
' Plums 1.69
' Braeburn Apples 1.49
' Peaches 1.99
' Golden Delicious Apples 1.29
' Nectarine 1.99
'
'Displays the elements using the Keys, Values, Count, and Item properties:
' INDEX KEY VALUE
' 0 Strawberries 3.33
' 1 Yellow Bananas 0.79
' 2 Cranberries 5.98
' 3 Grapes 1.99
' 4 Granny Smith Apples 0.89
' 5 Seedless Watermelon 0.49
' 6 Honeydew Melon 0.59
' 7 Red Delicious Apples 0.99
' 8 Navel Oranges 1.29
' 9 Fuji Apples 1.29
' 10 Plantain Bananas 1.49
' 11 Gala Apples 1.49
' 12 Pineapple 1.49
' 13 Plums 1.69
' 14 Braeburn Apples 1.49
' 15 Peaches 1.99
' 16 Golden Delicious Apples 1.29
' 17 Nectarine 1.99
'
'Displays the elements in the array:
' KEY VALUE
' Strawberries 3.33
' Yellow Bananas 0.79
' Cranberries 5.98
' Grapes 1.99
' Granny Smith Apples 0.89
' Seedless Watermelon 0.49
' Honeydew Melon 0.59
' Red Delicious Apples 0.99
' Navel Oranges 1.29
' Fuji Apples 1.29
' Plantain Bananas 1.49
' Gala Apples 1.49
' Pineapple 1.49
' Plums 1.69
' Braeburn Apples 1.49
' Peaches 1.99
' Golden Delicious Apples 1.29
' Nectarine 1.99
'
'The collection does not contain the key "Kiwis".
'
'The collection contains the following elements after removing "Plums":
' KEY VALUE
' Strawberries 3.33
' Yellow Bananas 0.79
' Cranberries 5.98
' Grapes 1.99
' Granny Smith Apples 0.89
' Seedless Watermelon 0.49
' Honeydew Melon 0.59
' Red Delicious Apples 0.99
' Navel Oranges 1.29
' Fuji Apples 1.29
' Plantain Bananas 1.49
' Gala Apples 1.49
' Pineapple 1.49
' Braeburn Apples 1.49
' Peaches 1.99
' Golden Delicious Apples 1.29
' Nectarine 1.99
'
'The collection contains the following elements after it is cleared:
' KEY VALUE
using System;
using System.Collections;
using System.Collections.Specialized;
public class SamplesHybridDictionary {
public static void Main() {
// Creates and initializes a new HybridDictionary.
HybridDictionary myCol = new HybridDictionary();
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" );
myCol.Add( "Plantain Bananas", "1.49" );
myCol.Add( "Yellow Bananas", "0.79" );
myCol.Add( "Strawberries", "3.33" );
myCol.Add( "Cranberries", "5.98" );
myCol.Add( "Navel Oranges", "1.29" );
myCol.Add( "Grapes", "1.99" );
myCol.Add( "Honeydew Melon", "0.59" );
myCol.Add( "Seedless Watermelon", "0.49" );
myCol.Add( "Pineapple", "1.49" );
myCol.Add( "Nectarine", "1.99" );
myCol.Add( "Plums", "1.69" );
myCol.Add( "Peaches", "1.99" );
// Display the contents of the collection using foreach. This is the preferred method.
Console.WriteLine( "Displays the elements using foreach:" );
PrintKeysAndValues1( myCol );
// Display the contents of the collection using the enumerator.
Console.WriteLine( "Displays the elements using the IDictionaryEnumerator:" );
PrintKeysAndValues2( myCol );
// Display the contents of the collection using the Keys, Values, Count, and Item properties.
Console.WriteLine( "Displays the elements using the Keys, Values, Count, and Item properties:" );
PrintKeysAndValues3( myCol );
// Copies the HybridDictionary to an array with DictionaryEntry elements.
DictionaryEntry[] myArr = new DictionaryEntry[myCol.Count];
myCol.CopyTo( myArr, 0 );
// Displays the values in the array.
Console.WriteLine( "Displays the elements in the array:" );
Console.WriteLine( " KEY VALUE" );
for ( int i = 0; i < myArr.Length; i++ )
Console.WriteLine( " {0,-25} {1}", myArr[i].Key, myArr[i].Value );
Console.WriteLine();
// Searches for a key.
if ( myCol.Contains( "Kiwis" ) )
Console.WriteLine( "The collection contains the key \"Kiwis\"." );
else
Console.WriteLine( "The collection does not contain the key \"Kiwis\"." );
Console.WriteLine();
// Deletes a key.
myCol.Remove( "Plums" );
Console.WriteLine( "The collection contains the following elements after removing \"Plums\":" );
PrintKeysAndValues1( myCol );
// Clears the entire collection.
myCol.Clear();
Console.WriteLine( "The collection contains the following elements after it is cleared:" );
PrintKeysAndValues1( myCol );
}
// Uses the foreach statement which hides the complexity of the enumerator.
// NOTE: The foreach statement is the preferred way of enumerating the contents of a collection.
public static void PrintKeysAndValues1( IDictionary myCol ) {
Console.WriteLine( " KEY VALUE" );
foreach ( DictionaryEntry de in myCol )
Console.WriteLine( " {0,-25} {1}", de.Key, de.Value );
Console.WriteLine();
}
// Uses the enumerator.
// NOTE: The foreach statement is the preferred way of enumerating the contents of a collection.
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();
}
// Uses the Keys, Values, Count, and Item properties.
public static void PrintKeysAndValues3( HybridDictionary 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
Strawberries 3.33
Yellow Bananas 0.79
Cranberries 5.98
Grapes 1.99
Granny Smith Apples 0.89
Seedless Watermelon 0.49
Honeydew Melon 0.59
Red Delicious Apples 0.99
Navel Oranges 1.29
Fuji Apples 1.29
Plantain Bananas 1.49
Gala Apples 1.49
Pineapple 1.49
Plums 1.69
Braeburn Apples 1.49
Peaches 1.99
Golden Delicious Apples 1.29
Nectarine 1.99
Displays the elements using the IDictionaryEnumerator:
KEY VALUE
Strawberries 3.33
Yellow Bananas 0.79
Cranberries 5.98
Grapes 1.99
Granny Smith Apples 0.89
Seedless Watermelon 0.49
Honeydew Melon 0.59
Red Delicious Apples 0.99
Navel Oranges 1.29
Fuji Apples 1.29
Plantain Bananas 1.49
Gala Apples 1.49
Pineapple 1.49
Plums 1.69
Braeburn Apples 1.49
Peaches 1.99
Golden Delicious Apples 1.29
Nectarine 1.99
Displays the elements using the Keys, Values, Count, and Item properties:
INDEX KEY VALUE
0 Strawberries 3.33
1 Yellow Bananas 0.79
2 Cranberries 5.98
3 Grapes 1.99
4 Granny Smith Apples 0.89
5 Seedless Watermelon 0.49
6 Honeydew Melon 0.59
7 Red Delicious Apples 0.99
8 Navel Oranges 1.29
9 Fuji Apples 1.29
10 Plantain Bananas 1.49
11 Gala Apples 1.49
12 Pineapple 1.49
13 Plums 1.69
14 Braeburn Apples 1.49
15 Peaches 1.99
16 Golden Delicious Apples 1.29
17 Nectarine 1.99
Displays the elements in the array:
KEY VALUE
Strawberries 3.33
Yellow Bananas 0.79
Cranberries 5.98
Grapes 1.99
Granny Smith Apples 0.89
Seedless Watermelon 0.49
Honeydew Melon 0.59
Red Delicious Apples 0.99
Navel Oranges 1.29
Fuji Apples 1.29
Plantain Bananas 1.49
Gala Apples 1.49
Pineapple 1.49
Plums 1.69
Braeburn Apples 1.49
Peaches 1.99
Golden Delicious Apples 1.29
Nectarine 1.99
The collection does not contain the key "Kiwis".
The collection contains the following elements after removing "Plums":
KEY VALUE
Strawberries 3.33
Yellow Bananas 0.79
Cranberries 5.98
Grapes 1.99
Granny Smith Apples 0.89
Seedless Watermelon 0.49
Honeydew Melon 0.59
Red Delicious Apples 0.99
Navel Oranges 1.29
Fuji Apples 1.29
Plantain Bananas 1.49
Gala Apples 1.49
Pineapple 1.49
Braeburn Apples 1.49
Peaches 1.99
Golden Delicious Apples 1.29
Nectarine 1.99
The collection contains the following elements after it is cleared:
KEY VALUE
*/
#using <System.dll>
using namespace System;
using namespace System::Collections;
using namespace System::Collections::Specialized;
void PrintKeysAndValues1( IDictionary^ myCol );
void PrintKeysAndValues2( IDictionary^ myCol );
void PrintKeysAndValues3( HybridDictionary^ myCol );
int main()
{
// Creates and initializes a new HybridDictionary.
HybridDictionary^ myCol = gcnew HybridDictionary;
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" );
myCol->Add( "Plantain Bananas", "1.49" );
myCol->Add( "Yellow Bananas", "0.79" );
myCol->Add( "Strawberries", "3.33" );
myCol->Add( "Cranberries", "5.98" );
myCol->Add( "Navel Oranges", "1.29" );
myCol->Add( "Grapes", "1.99" );
myCol->Add( "Honeydew Melon", "0.59" );
myCol->Add( "Seedless Watermelon", "0.49" );
myCol->Add( "Pineapple", "1.49" );
myCol->Add( "Nectarine", "1.99" );
myCol->Add( "Plums", "1.69" );
myCol->Add( "Peaches", "1.99" );
// Display the contents of the collection using for each. This is the preferred method.
Console::WriteLine( "Displays the elements using for each:" );
PrintKeysAndValues1( myCol );
// Display the contents of the collection using the enumerator.
Console::WriteLine( "Displays the elements using the IDictionaryEnumerator:" );
PrintKeysAndValues2( myCol );
// Display the contents of the collection using the Keys, Values, Count, and Item properties.
Console::WriteLine( "Displays the elements using the Keys, Values, Count, and Item properties:" );
PrintKeysAndValues3( myCol );
// Copies the HybridDictionary to an array with DictionaryEntry elements.
array<DictionaryEntry>^myArr = gcnew array<DictionaryEntry>(myCol->Count);
myCol->CopyTo( myArr, 0 );
// Displays the values in the array.
Console::WriteLine( "Displays the elements in the array:" );
Console::WriteLine( " KEY VALUE" );
for ( int i = 0; i < myArr->Length; i++ )
Console::WriteLine( " {0,-25} {1}", myArr[ i ].Key, myArr[ i ].Value );
Console::WriteLine();
// Searches for a key.
if ( myCol->Contains( "Kiwis" ) )
Console::WriteLine( "The collection contains the key \"Kiwis\"." );
else
Console::WriteLine( "The collection does not contain the key \"Kiwis\"." );
Console::WriteLine();
// Deletes a key.
myCol->Remove( "Plums" );
Console::WriteLine( "The collection contains the following elements after removing \"Plums\":" );
PrintKeysAndValues1( myCol );
// Clears the entire collection.
myCol->Clear();
Console::WriteLine( "The collection contains the following elements after it is cleared:" );
PrintKeysAndValues1( myCol );
}
// Uses the for each statement which hides the complexity of the enumerator.
// NOTE: The for each statement is the preferred way of enumerating the contents of a collection.
void PrintKeysAndValues1( IDictionary^ myCol ) {
Console::WriteLine( " KEY VALUE" );
for each ( DictionaryEntry^ de in myCol )
Console::WriteLine( " {0,-25} {1}", de->Key, de->Value );
Console::WriteLine();
}
// Uses the enumerator.
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();
}
// Uses the Keys, Values, Count, and Item properties.
void PrintKeysAndValues3( HybridDictionary^ myCol )
{
array<String^>^myKeys = gcnew array<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 for each:
KEY VALUE
Strawberries 3.33
Yellow Bananas 0.79
Cranberries 5.98
Grapes 1.99
Granny Smith Apples 0.89
Seedless Watermelon 0.49
Honeydew Melon 0.59
Red Delicious Apples 0.99
Navel Oranges 1.29
Fuji Apples 1.29
Plantain Bananas 1.49
Gala Apples 1.49
Pineapple 1.49
Plums 1.69
Braeburn Apples 1.49
Peaches 1.99
Golden Delicious Apples 1.29
Nectarine 1.99
Displays the elements using the IDictionaryEnumerator:
KEY VALUE
Strawberries 3.33
Yellow Bananas 0.79
Cranberries 5.98
Grapes 1.99
Granny Smith Apples 0.89
Seedless Watermelon 0.49
Honeydew Melon 0.59
Red Delicious Apples 0.99
Navel Oranges 1.29
Fuji Apples 1.29
Plantain Bananas 1.49
Gala Apples 1.49
Pineapple 1.49
Plums 1.69
Braeburn Apples 1.49
Peaches 1.99
Golden Delicious Apples 1.29
Nectarine 1.99
Displays the elements using the Keys, Values, Count, and Item properties:
INDEX KEY VALUE
0 Strawberries 3.33
1 Yellow Bananas 0.79
2 Cranberries 5.98
3 Grapes 1.99
4 Granny Smith Apples 0.89
5 Seedless Watermelon 0.49
6 Honeydew Melon 0.59
7 Red Delicious Apples 0.99
8 Navel Oranges 1.29
9 Fuji Apples 1.29
10 Plantain Bananas 1.49
11 Gala Apples 1.49
12 Pineapple 1.49
13 Plums 1.69
14 Braeburn Apples 1.49
15 Peaches 1.99
16 Golden Delicious Apples 1.29
17 Nectarine 1.99
Displays the elements in the array:
KEY VALUE
Strawberries 3.33
Yellow Bananas 0.79
Cranberries 5.98
Grapes 1.99
Granny Smith Apples 0.89
Seedless Watermelon 0.49
Honeydew Melon 0.59
Red Delicious Apples 0.99
Navel Oranges 1.29
Fuji Apples 1.29
Plantain Bananas 1.49
Gala Apples 1.49
Pineapple 1.49
Plums 1.69
Braeburn Apples 1.49
Peaches 1.99
Golden Delicious Apples 1.29
Nectarine 1.99
The collection does not contain the key "Kiwis".
The collection contains the following elements after removing "Plums":
KEY VALUE
Strawberries 3.33
Yellow Bananas 0.79
Cranberries 5.98
Grapes 1.99
Granny Smith Apples 0.89
Seedless Watermelon 0.49
Honeydew Melon 0.59
Red Delicious Apples 0.99
Navel Oranges 1.29
Fuji Apples 1.29
Plantain Bananas 1.49
Gala Apples 1.49
Pineapple 1.49
Braeburn Apples 1.49
Peaches 1.99
Golden Delicious Apples 1.29
Nectarine 1.99
The collection contains the following elements after it is cleared:
KEY VALUE
*/
import System.*;
import System.Collections.*;
import System.Collections.Specialized.*;
public class SamplesHybridDictionary
{
public static void main(String[] args)
{
// Creates and initializes a new HybridDictionary.
HybridDictionary myCol = new HybridDictionary();
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");
myCol.Add("Plantain Bananas", "1.49");
myCol.Add("Yellow Bananas", "0.79");
myCol.Add("Strawberries", "3.33");
myCol.Add("Cranberries", "5.98");
myCol.Add("Navel Oranges", "1.29");
myCol.Add("Grapes", "1.99");
myCol.Add("Honeydew Melon", "0.59");
myCol.Add("Seedless Watermelon", "0.49");
myCol.Add("Pineapple", "1.49");
myCol.Add("Nectarine", "1.99");
myCol.Add("Plums", "1.69");
myCol.Add("Peaches", "1.99");
// Display the contents of the collection using for. This is the
// preferred method.
Console.WriteLine("Displays the elements using for:");
PrintKeysAndValues1(myCol);
// Display the contents of the collection using the enumerator.
Console.WriteLine("Displays the elements using the"
+ " IDictionaryEnumerator:");
PrintKeysAndValues2(myCol);
// Display the contents of the collection using the Keys, Values,
// Count, and Item properties.
Console.WriteLine("Displays the elements using the Keys, Values,"
+ " Count, and Item properties:");
PrintKeysAndValues3(myCol);
// Copies the HybridDictionary to an array with DictionaryEntry
// elements.
DictionaryEntry myArr[] = new DictionaryEntry[myCol.get_Count()];
myCol.CopyTo(myArr, 0);
// Displays the values in the array.
Console.WriteLine("Displays the elements in the array:");
Console.WriteLine(" KEY VALUE");
for(int i=0;i < myArr.length;i++) {
Console.WriteLine(" {0,-25} {1}", myArr[i].get_Key(),
myArr[i].get_Value());
}
Console.WriteLine();
// Searches for a key.
if (myCol.Contains("Kiwis")) {
Console.WriteLine("The collection contains the key \"Kiwis\".");
}
else {
Console.WriteLine("The collection does not contain the key"
+ " \"Kiwis\".");
}
Console.WriteLine();
// Deletes a key.
myCol.Remove("Plums");
Console.WriteLine("The collection contains the following elements"
+ " after removing \"Plums\":");
PrintKeysAndValues1(myCol);
// Clears the entire collection.
myCol.Clear();
Console.WriteLine("The collection contains the following elements"
+ " after it is cleared:");
PrintKeysAndValues1(myCol);
} //main
// Uses the for statement which hides the complexity of the enumerator.
// NOTE: The for statement is the preferred way of enumerating the
// contents of a collection.
public static void PrintKeysAndValues1(IDictionary myCol)
{
String strKeys[] = new String[myCol.get_Count()];
myCol.get_Keys().CopyTo(strKeys,0);
Console.WriteLine(" KEY VALUE");
for (int iCtr=0; iCtr < myCol.get_Count(); iCtr++) {
Console.WriteLine(" {0,-25} {1}", strKeys[iCtr],
myCol.get_Item(strKeys[iCtr]));
}
Console.WriteLine();
} //PrintKeysAndValues1
// Uses the enumerator.
// NOTE: The for statement is the preferred way of enumerating the
// contents of a collection.
public static void PrintKeysAndValues2(IDictionary myCol)
{
IDictionaryEnumerator myEnumerator = myCol.GetEnumerator();
Console.WriteLine(" KEY VALUE");
while(myEnumerator.MoveNext()) {
Console.WriteLine(" {0,-25} {1}", myEnumerator.get_Key(),
myEnumerator.get_Value());
}
Console.WriteLine();
} //PrintKeysAndValues2
// Uses the Keys, Values, Count, and Item properties.
public static void PrintKeysAndValues3(HybridDictionary myCol)
{
String myKeys[] = new String[myCol.get_Count()];
myCol.get_Keys().CopyTo(myKeys, 0);
Console.WriteLine(" INDEX KEY VALUE");
for(int i=0;i < myCol.get_Count();i ++) {
Console.WriteLine(" {0,-5} {1,-25} {2}", (Int32)i, myKeys[i],
myCol.get_Item(myKeys[i]));
}
Console.WriteLine();
} //PrintKeysAndValues3
} //SamplesHybridDictionary
/*
Displays the elements using for:
KEY VALUE
Strawberries 3.33
Yellow Bananas 0.79
Cranberries 5.98
Grapes 1.99
Granny Smith Apples 0.89
Seedless Watermelon 0.49
Honeydew Melon 0.59
Red Delicious Apples 0.99
Navel Oranges 1.29
Fuji Apples 1.29
Plantain Bananas 1.49
Gala Apples 1.49
Pineapple 1.49
Plums 1.69
Braeburn Apples 1.49
Peaches 1.99
Golden Delicious Apples 1.29
Nectarine 1.99
Displays the elements using the IDictionaryEnumerator:
KEY VALUE
Strawberries 3.33
Yellow Bananas 0.79
Cranberries 5.98
Grapes 1.99
Granny Smith Apples 0.89
Seedless Watermelon 0.49
Honeydew Melon 0.59
Red Delicious Apples 0.99
Navel Oranges 1.29
Fuji Apples 1.29
Plantain Bananas 1.49
Gala Apples 1.49
Pineapple 1.49
Plums 1.69
Braeburn Apples 1.49
Peaches 1.99
Golden Delicious Apples 1.29
Nectarine 1.99
Displays the elements using the Keys, Values, Count, and Item properties:
INDEX KEY VALUE
0 Strawberries 3.33
1 Yellow Bananas 0.79
2 Cranberries 5.98
3 Grapes 1.99
4 Granny Smith Apples 0.89
5 Seedless Watermelon 0.49
6 Honeydew Melon 0.59
7 Red Delicious Apples 0.99
8 Navel Oranges 1.29
9 Fuji Apples 1.29
10 Plantain Bananas 1.49
11 Gala Apples 1.49
12 Pineapple 1.49
13 Plums 1.69
14 Braeburn Apples 1.49
15 Peaches 1.99
16 Golden Delicious Apples 1.29
17 Nectarine 1.99
Displays the elements in the array:
KEY VALUE
Strawberries 3.33
Yellow Bananas 0.79
Cranberries 5.98
Grapes 1.99
Granny Smith Apples 0.89
Seedless Watermelon 0.49
Honeydew Melon 0.59
Red Delicious Apples 0.99
Navel Oranges 1.29
Fuji Apples 1.29
Plantain Bananas 1.49
Gala Apples 1.49
Pineapple 1.49
Plums 1.69
Braeburn Apples 1.49
Peaches 1.99
Golden Delicious Apples 1.29
Nectarine 1.99
The collection does not contain the key "Kiwis".
The collection contains the following elements after removing "Plums":
KEY VALUE
Strawberries 3.33
Yellow Bananas 0.79
Cranberries 5.98
Grapes 1.99
Granny Smith Apples 0.89
Seedless Watermelon 0.49
Honeydew Melon 0.59
Red Delicious Apples 0.99
Navel Oranges 1.29
Fuji Apples 1.29
Plantain Bananas 1.49
Gala Apples 1.49
Pineapple 1.49
Braeburn Apples 1.49
Peaches 1.99
Golden Delicious Apples 1.29
Nectarine 1.99
The collection contains the following elements after it is cleared:
KEY VALUE
*/
System.Object
System.Collections.Specialized.HybridDictionary
System.Web.Mobile.CookielessData
Seguridad para subprocesos
Los miembros estáticos públicos (Shared en Visual Basic) de este tipo son seguros para la ejecución de subprocesos. No se garantiza que los miembros de instancias sean seguros para la ejecución de subprocesos.
Esta implementación no proporciona un contenedor sincronizado (seguro para la ejecución de subprocesos) para una clase HybridDictionary, pero las clases derivadas pueden crear sus propias versiones sincronizadas de HybridDictionary mediante la propiedad SyncRoot.
La enumeración a través de una colección es un procedimiento sin seguridad intrínseca para la ejecución de subprocesos. Aunque una colección esté sincronizada, otros subprocesos pueden seguir modificándola, lo que hace que el enumerador produzca una excepción. Con el fin de garantizar la seguridad para la ejecución de subprocesos durante la enumeración, es posible bloquear la colección durante toda la enumeración o detectar las excepciones debidas a cambios efectuados por otros subprocesos.
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium, Windows Mobile para Pocket PC, Windows Mobile para Smartphone, Windows Server 2003, Windows XP Media Center, Windows XP Professional x64, Windows XP SP2, Windows XP Starter Edition
.NET Framework no admite todas las versiones de cada plataforma. Para obtener una lista de las versiones admitidas, vea Requisitos del sistema.
.NET Framework
Compatible con: 2.0, 1.1, 1.0
.NET Compact Framework
Compatible con: 2.0, 1.0