HybridDictionary Classe

Definizione

Implementa IDictionary utilizzando una ListDictionary quando la raccolta è di piccole dimensioni e passa a una Hashtable quando le dimensioni della raccolta aumentano.Implements IDictionary by using a ListDictionary while the collection is small, and then switching to a Hashtable when the collection gets large.

public ref class HybridDictionary : System::Collections::IDictionary
[System.Serializable]
public class HybridDictionary : System.Collections.IDictionary
type HybridDictionary = class
    interface IDictionary
    interface ICollection
    interface IEnumerable
Public Class HybridDictionary
Implements IDictionary
Ereditarietà
HybridDictionary
Derivato
Attributi
Implementazioni

Esempi

Nell'esempio di codice riportato di seguito vengono illustrate molte delle HybridDictionaryproprietà e dei metodi di.The following code example demonstrates several of the properties and methods of HybridDictionary.

#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

*/
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

*/
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

   ' 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


   ' 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


   ' 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

End Class


'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

Commenti

Questa classe è consigliata per i casi in cui il numero di elementi in un dizionario è sconosciuto.This class is recommended for cases where the number of elements in a dictionary is unknown. Sfrutta i vantaggi delle migliori prestazioni di un ListDictionary con raccolte di piccole dimensioni e offre la flessibilità di passare a un oggetto Hashtable che gestisce le raccolte più ListDictionarygrandi rispetto a.It takes advantage of the improved performance of a ListDictionary with small collections, and offers the flexibility of switching to a Hashtable which handles larger collections better than ListDictionary.

Se le dimensioni iniziali della raccolta sono maggiori della dimensione ottimale ListDictionaryper un oggetto, la raccolta viene archiviata in un oggetto Hashtable per evitare il sovraccarico ListDictionary dovuto alla copia di Hashtableelementi da a.If the initial size of the collection is greater than the optimal size for a ListDictionary, the collection is stored in a Hashtable to avoid the overhead of copying elements from the ListDictionary to a Hashtable.

Il costruttore accetta un parametro booleano che consente all'utente di specificare se la raccolta ignora la distinzione tra maiuscole e minuscole durante il confronto delle stringhe.The constructor accepts a Boolean parameter that allows the user to specify whether the collection ignores the case when comparing strings. Se per la raccolta viene fatta distinzione tra maiuscole e minuscole, vengono utilizzate Object.GetHashCode le Object.Equalsimplementazioni della chiave di e.If the collection is case-sensitive, it uses the key's implementations of Object.GetHashCode and Object.Equals. Se la raccolta non fa distinzione tra maiuscole e minuscole, esegue un confronto ordinale senza distinzione tra maiuscole e minuscole, che obbedisce solo alle regole di maiuscole e minuscole delle impostazioni cultura invarianti.If the collection is case-insensitive, it performs a simple ordinal case-insensitive comparison, which obeys the casing rules of the invariant culture only. Per impostazione predefinita, la raccolta fa distinzione tra maiuscole e minuscole.By default, the collection is case-sensitive. Per ulteriori informazioni sulle impostazioni cultura invarianti, System.Globalization.CultureInfovedere.For more information on the invariant culture, see System.Globalization.CultureInfo.

Una chiave non può essere null, ma un valore può essere.A key cannot be null, but a value can.

L' foreach istruzione del C# linguaggio (For Each in Visual Basic) restituisce un oggetto del tipo degli elementi nella raccolta.The foreach statement of the C# language (For Each in Visual Basic) returns an object of the type of the elements in the collection. Poiché ogni elemento di HybridDictionary è una coppia chiave/valore, il tipo di elemento non è il tipo della chiave o il tipo del valore.Since each element of the HybridDictionary is a key/value pair, the element type is not the type of the key or the type of the value. Al contrario, il tipo di DictionaryEntryelemento è.Instead, the element type is DictionaryEntry. Ad esempio:For example:

for each (DictionaryEntry^ de in myHybridDictionary)
{
    //...
}
foreach (DictionaryEntry de in myHybridDictionary)
{
    //...
}
For Each de In myHybridDictionary
    '...
Next

L' foreach istruzione è un wrapper per l'enumeratore, che consente solo la lettura, non la scrittura, della raccolta.The foreach statement is a wrapper around the enumerator, which only allows reading from, not writing to, the collection.

Costruttori

HybridDictionary()

Crea un oggetto HybridDictionary vuoto con distinzione tra maiuscole e minuscole.Creates an empty case-sensitive HybridDictionary.

HybridDictionary(Boolean)

Crea un oggetto HybridDictionary vuoto con il comportamento relativo a maiuscole e minuscole specificato.Creates an empty HybridDictionary with the specified case sensitivity.

HybridDictionary(Int32)

Crea un oggetto HybridDictionary con la distinzione tra maiuscole e minuscole e con le dimensioni iniziali specificate.Creates a case-sensitive HybridDictionary with the specified initial size.

HybridDictionary(Int32, Boolean)

Crea un oggetto HybridDictionary con comportamento relativo a maiuscole e minuscole e dimensione iniziale specificati.Creates a HybridDictionary with the specified initial size and case sensitivity.

Proprietà

Count

Ottiene il numero di coppie chiave/valore contenute in HybridDictionary.Gets the number of key/value pairs contained in the HybridDictionary.

IsFixedSize

Ottiene un valore che indica se HybridDictionary ha dimensioni fisse.Gets a value indicating whether the HybridDictionary has a fixed size.

IsReadOnly

Ottiene un valore che indica se HybridDictionary è di sola lettura.Gets a value indicating whether the HybridDictionary is read-only.

IsSynchronized

Ottiene un valore che indica se la classe HybridDictionary è sincronizzata (thread-safe).Gets a value indicating whether the HybridDictionary is synchronized (thread safe).

Item[Object]

Ottiene o imposta il valore associato alla chiave specificata.Gets or sets the value associated with the specified key.

Keys

Ottiene un oggetto ICollection contenente le chiavi presenti nell'oggetto HybridDictionary.Gets an ICollection containing the keys in the HybridDictionary.

SyncRoot

Ottiene un oggetto che può essere usato per sincronizzare l'accesso a HybridDictionary.Gets an object that can be used to synchronize access to the HybridDictionary.

Values

Ottiene ICollection contenente i valori in HybridDictionary.Gets an ICollection containing the values in the HybridDictionary.

Metodi

Add(Object, Object)

Aggiunge una voce con la chiave e il valore specificati nell'oggetto HybridDictionary.Adds an entry with the specified key and value into the HybridDictionary.

Clear()

Rimuove tutte le voci da HybridDictionary.Removes all entries from the HybridDictionary.

Contains(Object)

Determina se l'oggetto HybridDictionary contiene una chiave specifica.Determines whether the HybridDictionary contains a specific key.

CopyTo(Array, Int32)

Copia le voci dell'oggetto HybridDictionary in un'istanza di Array unidimensionale in corrispondenza dell'indice specificato.Copies the HybridDictionary entries to a one-dimensional Array instance at the specified index.

Equals(Object)

Determina se l'oggetto specificato è uguale all'oggetto corrente.Determines whether the specified object is equal to the current object.

(Ereditato da Object)
GetEnumerator()

Restituisce un oggetto IDictionaryEnumerator che esegue l'iterazione di HybridDictionary.Returns an IDictionaryEnumerator that iterates through the HybridDictionary.

GetHashCode()

Funge da funzione hash predefinita.Serves as the default hash function.

(Ereditato da Object)
GetType()

Ottiene l'oggetto Type dell'istanza corrente.Gets the Type of the current instance.

(Ereditato da Object)
MemberwiseClone()

Crea una copia superficiale dell'oggetto Object corrente.Creates a shallow copy of the current Object.

(Ereditato da Object)
Remove(Object)

Rimuove la voce con la chiave specificata da HybridDictionary.Removes the entry with the specified key from the HybridDictionary.

ToString()

Restituisce una stringa che rappresenta l'oggetto corrente.Returns a string that represents the current object.

(Ereditato da Object)

Implementazioni dell'interfaccia esplicita

IEnumerable.GetEnumerator()

Restituisce un oggetto IEnumerator che esegue l'iterazione di HybridDictionary.Returns an IEnumerator that iterates through the HybridDictionary.

Metodi di estensione

Cast<TResult>(IEnumerable)

Esegue il cast degli elementi di un oggetto IEnumerable nel tipo specificato.Casts the elements of an IEnumerable to the specified type.

OfType<TResult>(IEnumerable)

Filtra gli elementi di un oggetto IEnumerable in base a un tipo specificato.Filters the elements of an IEnumerable based on a specified type.

AsParallel(IEnumerable)

Consente la parallelizzazione di una query.Enables parallelization of a query.

AsQueryable(IEnumerable)

Converte un oggetto IEnumerable in un oggetto IQueryable.Converts an IEnumerable to an IQueryable.

Si applica a

Thread safety

I membri staticiShared pubblici (in Visual Basic) di questo tipo sono thread-safe.Public static (Shared in Visual Basic) members of this type are thread safe. I membri di istanza non sono garantiti come thread-safe.Any instance members are not guaranteed to be thread safe.

Questa implementazione non fornisce un wrapper sincronizzato (thread-safe) per HybridDictionaryun, ma le classi derivate possono creare le proprie HybridDictionary versioni sincronizzate di utilizzando la SyncRoot proprietà.This implementation does not provide a synchronized (thread safe) wrapper for a HybridDictionary, but derived classes can create their own synchronized versions of the HybridDictionary using the SyncRoot property.

L'enumerazione di una raccolta non è di per sé una procedura thread-safe.Enumerating through a collection is intrinsically not a thread-safe procedure. Anche se una raccolta è sincronizzata, è possibile che venga modificata da altri thread, con conseguente generazione di un'eccezione da parte dell'enumeratore.Even when a collection is synchronized, other threads can still modify the collection, which causes the enumerator to throw an exception. Per garantire la protezione dei thread durante l'enumerazione, è possibile bloccare la raccolta per l'intera enumerazione oppure intercettare le eccezioni determinate dalle modifiche apportate da altri thread.To guarantee thread safety during enumeration, you can either lock the collection during the entire enumeration or catch the exceptions resulting from changes made by other threads.

Vedi anche