DictionaryBase Klasse

Definition

Stellt die abstract-Basisklasse für eine stark typisierte Auflistung von Schlüssel-Wert-Paaren bereit.Provides the abstract base class for a strongly typed collection of key/value pairs.

public ref class DictionaryBase abstract : System::Collections::IDictionary
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public abstract class DictionaryBase : System.Collections.IDictionary
type DictionaryBase = class
    interface IDictionary
    interface ICollection
    interface IEnumerable
Public MustInherit Class DictionaryBase
Implements IDictionary
Vererbung
DictionaryBase
Abgeleitet
Attribute
Implementiert

Beispiele

Im folgenden Codebeispiel wird die DictionaryBase-Klasse implementiert, und diese Implementierung wird verwendet, um ein Wörterbuch mit String-Schlüsseln und-Werten zu erstellen, die einen Length mit maximal 5 Zeichen aufweisen.The following code example implements the DictionaryBase class and uses that implementation to create a dictionary of String keys and values that have a Length of 5 characters or less.

using namespace System;
using namespace System::Collections;

public ref class ShortStringDictionary: public DictionaryBase
{
public:

   property String^ Item [String^]
   {
      String^ get( String^ key )
      {
         return (dynamic_cast<String^>(Dictionary[ key ]));
      }

      void set( String^ value, String^ key )
      {
         Dictionary[ key ] = value;
      }
   }

   property ICollection^ Keys 
   {
      ICollection^ get()
      {
         return (Dictionary->Keys);
      }
   }

   property ICollection^ Values 
   {
      ICollection^ get()
      {
         return (Dictionary->Values);
      }
   }
   void Add( String^ key, String^ value )
   {
      Dictionary->Add( key, value );
   }

   bool Contains( String^ key )
   {
      return (Dictionary->Contains( key ));
   }

   void Remove( String^ key )
   {
      Dictionary->Remove( key );
   }


protected:
   virtual void OnInsert( Object^ key, Object^ value ) override
   {
      if ( key->GetType() != Type::GetType( "System.String" ) )
            throw gcnew ArgumentException( "key must be of type String.","key" );
      else
      {
         String^ strKey = dynamic_cast<String^>(key);
         if ( strKey->Length > 5 )
                  throw gcnew ArgumentException( "key must be no more than 5 characters in length.","key" );
      }

      if ( value->GetType() != Type::GetType( "System.String" ) )
            throw gcnew ArgumentException( "value must be of type String.","value" );
      else
      {
         String^ strValue = dynamic_cast<String^>(value);
         if ( strValue->Length > 5 )
                  throw gcnew ArgumentException( "value must be no more than 5 characters in length.","value" );
      }
   }

   virtual void OnRemove( Object^ key, Object^ /*value*/ ) override
   {
      if ( key->GetType() != Type::GetType( "System.String" ) )
            throw gcnew ArgumentException( "key must be of type String.","key" );
      else
      {
         String^ strKey = dynamic_cast<String^>(key);
         if ( strKey->Length > 5 )
                  throw gcnew ArgumentException( "key must be no more than 5 characters in length.","key" );
      }
   }

   virtual void OnSet( Object^ key, Object^ /*oldValue*/, Object^ newValue ) override
   {
      if ( key->GetType() != Type::GetType( "System.String" ) )
            throw gcnew ArgumentException( "key must be of type String.","key" );
      else
      {
         String^ strKey = dynamic_cast<String^>(key);
         if ( strKey->Length > 5 )
                  throw gcnew ArgumentException( "key must be no more than 5 characters in length.","key" );
      }

      if ( newValue->GetType() != Type::GetType( "System.String" ) )
            throw gcnew ArgumentException( "newValue must be of type String.","newValue" );
      else
      {
         String^ strValue = dynamic_cast<String^>(newValue);
         if ( strValue->Length > 5 )
                  throw gcnew ArgumentException( "newValue must be no more than 5 characters in length.","newValue" );
      }
   }

   virtual void OnValidate( Object^ key, Object^ value ) override
   {
      if ( key->GetType() != Type::GetType( "System.String" ) )
            throw gcnew ArgumentException( "key must be of type String.","key" );
      else
      {
         String^ strKey = dynamic_cast<String^>(key);
         if ( strKey->Length > 5 )
                  throw gcnew ArgumentException( "key must be no more than 5 characters in length.","key" );
      }

      if ( value->GetType() != Type::GetType( "System.String" ) )
            throw gcnew ArgumentException( "value must be of type String.","value" );
      else
      {
         String^ strValue = dynamic_cast<String^>(value);
         if ( strValue->Length > 5 )
                  throw gcnew ArgumentException( "value must be no more than 5 characters in length.","value" );
      }
   }

};

void PrintKeysAndValues2( ShortStringDictionary^ myCol );
void PrintKeysAndValues3( ShortStringDictionary^ myCol );
int main()
{
   // Creates and initializes a new DictionaryBase.
   ShortStringDictionary^ mySSC = gcnew ShortStringDictionary;

   // Adds elements to the collection.
   mySSC->Add( "One", "a" );
   mySSC->Add( "Two", "ab" );
   mySSC->Add( "Three", "abc" );
   mySSC->Add( "Four", "abcd" );
   mySSC->Add( "Five", "abcde" );

   // Display the contents of the collection using the enumerator.
   Console::WriteLine( "Contents of the collection (using enumerator):" );
   PrintKeysAndValues2( mySSC );

   // Display the contents of the collection using the Keys property and the Item property.
   Console::WriteLine( "Initial contents of the collection (using Keys and Item):" );
   PrintKeysAndValues3( mySSC );

   // Tries to add a value that is too long.
   try
   {
      mySSC->Add( "Ten", "abcdefghij" );
   }
   catch ( ArgumentException^ e ) 
   {
      Console::WriteLine( e );
   }

   // Tries to add a key that is too long.
   try
   {
      mySSC->Add( "Eleven", "ijk" );
   }
   catch ( ArgumentException^ e ) 
   {
      Console::WriteLine( e );
   }

   Console::WriteLine();

   // Searches the collection with Contains.
   Console::WriteLine( "Contains \"Three\": {0}", mySSC->Contains( "Three" ) );
   Console::WriteLine( "Contains \"Twelve\": {0}", mySSC->Contains( "Twelve" ) );
   Console::WriteLine();

   // Removes an element from the collection.
   mySSC->Remove( "Two" );

   // Displays the contents of the collection.
   Console::WriteLine( "After removing \"Two\":" );
   PrintKeysAndValues2( mySSC );
}

// Uses the enumerator. 
void PrintKeysAndValues2( ShortStringDictionary^ myCol )
{
   DictionaryEntry myDE;
   System::Collections::IEnumerator^ myEnumerator = myCol->GetEnumerator();
   while ( myEnumerator->MoveNext() )
      if ( myEnumerator->Current != nullptr )
   {
      myDE =  *dynamic_cast<DictionaryEntry^>(myEnumerator->Current);
      Console::WriteLine( "   {0,-5} : {1}", myDE.Key, myDE.Value );
   }

   Console::WriteLine();
}


// Uses the Keys property and the Item property.
void PrintKeysAndValues3( ShortStringDictionary^ myCol )
{
   ICollection^ myKeys = myCol->Keys;
   IEnumerator^ myEnum1 = myKeys->GetEnumerator();
   while ( myEnum1->MoveNext() )
   {
      String^ k = safe_cast<String^>(myEnum1->Current);
      Console::WriteLine( "   {0,-5} : {1}", k, myCol->Item[ k ] );
   }

   Console::WriteLine();
}

/* 
This code produces the following output.

Contents of the collection (using enumerator):
   Three : abc
   Five  : abcde
   Two   : ab
   One   : a
   Four  : abcd

Initial contents of the collection (using Keys and Item):
   Three : abc
   Five  : abcde
   Two   : ab
   One   : a
   Four  : abcd

System.ArgumentException: value must be no more than 5 characters in length.
Parameter name: value
   at ShortStringDictionary.OnValidate(Object key, Object value)
   at System.Collections.DictionaryBase.System.Collections.IDictionary.Add(Object key, Object value)
   at SamplesDictionaryBase.Main()
System.ArgumentException: key must be no more than 5 characters in length.
Parameter name: key
   at ShortStringDictionary.OnValidate(Object key, Object value)
   at System.Collections.DictionaryBase.System.Collections.IDictionary.Add(Object key, Object value)
   at SamplesDictionaryBase.Main()

Contains "Three": True
Contains "Twelve": False

After removing "Two":
   Three : abc
   Five  : abcde
   One   : a
   Four  : abcd

*/
using System;
using System.Collections;

public class ShortStringDictionary : DictionaryBase  {

   public String this[ String key ]  {
      get  {
         return( (String) Dictionary[key] );
      }
      set  {
         Dictionary[key] = value;
      }
   }

   public ICollection Keys  {
      get  {
         return( Dictionary.Keys );
      }
   }

   public ICollection Values  {
      get  {
         return( Dictionary.Values );
      }
   }

   public void Add( String key, String value )  {
      Dictionary.Add( key, value );
   }

   public bool Contains( String key )  {
      return( Dictionary.Contains( key ) );
   }

   public void Remove( String key )  {
      Dictionary.Remove( key );
   }

   protected override void OnInsert( Object key, Object value )  {
      if ( key.GetType() != typeof(System.String) )
         throw new ArgumentException( "key must be of type String.", "key" );
      else  {
         String strKey = (String) key;
         if ( strKey.Length > 5 )
            throw new ArgumentException( "key must be no more than 5 characters in length.", "key" );
      }

      if ( value.GetType() != typeof(System.String) )
         throw new ArgumentException( "value must be of type String.", "value" );
      else  {
         String strValue = (String) value;
         if ( strValue.Length > 5 )
            throw new ArgumentException( "value must be no more than 5 characters in length.", "value" );
      }
   }

   protected override void OnRemove( Object key, Object value )  {
      if ( key.GetType() != typeof(System.String) )
         throw new ArgumentException( "key must be of type String.", "key" );
      else  {
         String strKey = (String) key;
         if ( strKey.Length > 5 )
            throw new ArgumentException( "key must be no more than 5 characters in length.", "key" );
      }
   }

   protected override void OnSet( Object key, Object oldValue, Object newValue )  {
      if ( key.GetType() != typeof(System.String) )
         throw new ArgumentException( "key must be of type String.", "key" );
      else  {
         String strKey = (String) key;
         if ( strKey.Length > 5 )
            throw new ArgumentException( "key must be no more than 5 characters in length.", "key" );
      }

      if ( newValue.GetType() != typeof(System.String) )
         throw new ArgumentException( "newValue must be of type String.", "newValue" );
      else  {
         String strValue = (String) newValue;
         if ( strValue.Length > 5 )
            throw new ArgumentException( "newValue must be no more than 5 characters in length.", "newValue" );
      }
   }

   protected override void OnValidate( Object key, Object value )  {
      if ( key.GetType() != typeof(System.String) )
         throw new ArgumentException( "key must be of type String.", "key" );
      else  {
         String strKey = (String) key;
         if ( strKey.Length > 5 )
            throw new ArgumentException( "key must be no more than 5 characters in length.", "key" );
      }

      if ( value.GetType() != typeof(System.String) )
         throw new ArgumentException( "value must be of type String.", "value" );
      else  {
         String strValue = (String) value;
         if ( strValue.Length > 5 )
            throw new ArgumentException( "value must be no more than 5 characters in length.", "value" );
      }
   }

}


public class SamplesDictionaryBase  {

   public static void Main()  {
 
      // Creates and initializes a new DictionaryBase.
      ShortStringDictionary mySSC = new ShortStringDictionary();

      // Adds elements to the collection.
      mySSC.Add( "One", "a" );
      mySSC.Add( "Two", "ab" );
      mySSC.Add( "Three", "abc" );
      mySSC.Add( "Four", "abcd" );
      mySSC.Add( "Five", "abcde" );

      // Display the contents of the collection using foreach. This is the preferred method.
      Console.WriteLine( "Contents of the collection (using foreach):" );
      PrintKeysAndValues1( mySSC );

      // Display the contents of the collection using the enumerator.
      Console.WriteLine( "Contents of the collection (using enumerator):" );
      PrintKeysAndValues2( mySSC );

      // Display the contents of the collection using the Keys property and the Item property.
      Console.WriteLine( "Initial contents of the collection (using Keys and Item):" );
      PrintKeysAndValues3( mySSC );

      // Tries to add a value that is too long.
      try  {
         mySSC.Add( "Ten", "abcdefghij" );
      }
      catch ( ArgumentException e )  {
         Console.WriteLine( e.ToString() );
      }

      // Tries to add a key that is too long.
      try  {
         mySSC.Add( "Eleven", "ijk" );
      }
      catch ( ArgumentException e )  {
         Console.WriteLine( e.ToString() );
      }

      Console.WriteLine();

      // Searches the collection with Contains.
      Console.WriteLine( "Contains \"Three\": {0}", mySSC.Contains( "Three" ) );
      Console.WriteLine( "Contains \"Twelve\": {0}", mySSC.Contains( "Twelve" ) );
      Console.WriteLine();

      // Removes an element from the collection.
      mySSC.Remove( "Two" );

      // Displays the contents of the collection.
      Console.WriteLine( "After removing \"Two\":" );
      PrintKeysAndValues1( mySSC );

   }

   // 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( ShortStringDictionary myCol )  {
      foreach ( DictionaryEntry myDE in myCol )
         Console.WriteLine( "   {0,-5} : {1}", myDE.Key, myDE.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( ShortStringDictionary myCol )  {
      DictionaryEntry myDE;
      System.Collections.IEnumerator myEnumerator = myCol.GetEnumerator();
      while ( myEnumerator.MoveNext() )
         if ( myEnumerator.Current != null )  {
            myDE = (DictionaryEntry) myEnumerator.Current;
            Console.WriteLine( "   {0,-5} : {1}", myDE.Key, myDE.Value );
         }
      Console.WriteLine();
   }

   // Uses the Keys property and the Item property.
   public static void PrintKeysAndValues3( ShortStringDictionary myCol )  {
      ICollection myKeys = myCol.Keys;
      foreach ( String k in myKeys )
         Console.WriteLine( "   {0,-5} : {1}", k, myCol[k] );
      Console.WriteLine();
   }

}


/* 
This code produces the following output.

Contents of the collection (using foreach):
   Three : abc
   Five  : abcde
   Two   : ab
   One   : a
   Four  : abcd

Contents of the collection (using enumerator):
   Three : abc
   Five  : abcde
   Two   : ab
   One   : a
   Four  : abcd

Initial contents of the collection (using Keys and Item):
   Three : abc
   Five  : abcde
   Two   : ab
   One   : a
   Four  : abcd

System.ArgumentException: value must be no more than 5 characters in length.
Parameter name: value
   at ShortStringDictionary.OnValidate(Object key, Object value)
   at System.Collections.DictionaryBase.System.Collections.IDictionary.Add(Object key, Object value)
   at SamplesDictionaryBase.Main()
System.ArgumentException: key must be no more than 5 characters in length.
Parameter name: key
   at ShortStringDictionary.OnValidate(Object key, Object value)
   at System.Collections.DictionaryBase.System.Collections.IDictionary.Add(Object key, Object value)
   at SamplesDictionaryBase.Main()

Contains "Three": True
Contains "Twelve": False

After removing "Two":
   Three : abc
   Five  : abcde
   One   : a
   Four  : abcd

*/

Imports System.Collections

Public Class ShortStringDictionary
   Inherits DictionaryBase

   Default Public Property Item(key As String) As String
      Get
         Return CType(Dictionary(key), String)
      End Get
      Set
         Dictionary(key) = value
      End Set
   End Property

   Public ReadOnly Property Keys() As ICollection
      Get
         Return Dictionary.Keys
      End Get
   End Property

   Public ReadOnly Property Values() As ICollection
      Get
         Return Dictionary.Values
      End Get
   End Property

   Public Sub Add(key As String, value As String)
      Dictionary.Add(key, value)
   End Sub

   Public Function Contains(key As String) As Boolean
      Return Dictionary.Contains(key)
   End Function 'Contains

   Public Sub Remove(key As String)
      Dictionary.Remove(key)
   End Sub

   Protected Overrides Sub OnInsert(key As Object, value As Object)
      If Not GetType(System.String).IsAssignableFrom(key.GetType()) Then
         Throw New ArgumentException("key must be of type String.", "key")
      Else
         Dim strKey As String = CType(key, String)
         If strKey.Length > 5 Then
            Throw New ArgumentException("key must be no more than 5 characters in length.", "key")
         End If
      End If 
      If Not GetType(System.String).IsAssignableFrom(value.GetType()) Then
         Throw New ArgumentException("value must be of type String.", "value")
      Else
         Dim strValue As String = CType(value, String)
         If strValue.Length > 5 Then
            Throw New ArgumentException("value must be no more than 5 characters in length.", "value")
         End If
      End If
   End Sub

   Protected Overrides Sub OnRemove(key As Object, value As Object)
      If Not GetType(System.String).IsAssignableFrom(key.GetType()) Then
         Throw New ArgumentException("key must be of type String.", "key")
      Else
         Dim strKey As String = CType(key, String)
         If strKey.Length > 5 Then
            Throw New ArgumentException("key must be no more than 5 characters in length.", "key")
         End If
      End If
   End Sub

   Protected Overrides Sub OnSet(key As Object, oldValue As Object, newValue As Object)
      If Not GetType(System.String).IsAssignableFrom(key.GetType()) Then
         Throw New ArgumentException("key must be of type String.", "key")
      Else
         Dim strKey As String = CType(key, String)
         If strKey.Length > 5 Then
            Throw New ArgumentException("key must be no more than 5 characters in length.", "key")
         End If
      End If 
      If Not GetType(System.String).IsAssignableFrom(newValue.GetType()) Then
         Throw New ArgumentException("newValue must be of type String.", "newValue")
      Else
         Dim strValue As String = CType(newValue, String)
         If strValue.Length > 5 Then
            Throw New ArgumentException("newValue must be no more than 5 characters in length.", "newValue")
         End If
      End If
   End Sub

   Protected Overrides Sub OnValidate(key As Object, value As Object)
      If Not GetType(System.String).IsAssignableFrom(key.GetType()) Then
         Throw New ArgumentException("key must be of type String.", "key")
      Else
         Dim strKey As String = CType(key, String)
         If strKey.Length > 5 Then
            Throw New ArgumentException("key must be no more than 5 characters in length.", "key")
         End If
      End If 
      If Not GetType(System.String).IsAssignableFrom(value.GetType()) Then
         Throw New ArgumentException("value must be of type String.", "value")
      Else
         Dim strValue As String = CType(value, String)
         If strValue.Length > 5 Then
            Throw New ArgumentException("value must be no more than 5 characters in length.", "value")
         End If
      End If
   End Sub

End Class


Public Class SamplesDictionaryBase

   Public Shared Sub Main()

      ' Creates and initializes a new DictionaryBase.
      Dim mySSC As New ShortStringDictionary()

      ' Adds elements to the collection.
      mySSC.Add("One", "a")
      mySSC.Add("Two", "ab")
      mySSC.Add("Three", "abc")
      mySSC.Add("Four", "abcd")
      mySSC.Add("Five", "abcde")

      ' Display the contents of the collection using For Each. This is the preferred method.
      Console.WriteLine("Contents of the collection (using For Each):")
      PrintKeysAndValues1(mySSC)

      ' Display the contents of the collection using the enumerator.
      Console.WriteLine("Contents of the collection (using enumerator):")
      PrintKeysAndValues2(mySSC)

      ' Display the contents of the collection using the Keys property and the Item property.
      Console.WriteLine("Initial contents of the collection (using Keys and Item):")
      PrintKeysAndValues3(mySSC)

      ' Tries to add a value that is too long.
      Try
          mySSC.Add("Ten", "abcdefghij")
      Catch e As ArgumentException
          Console.WriteLine(e.ToString())
      End Try

      ' Tries to add a key that is too long.
      Try
          mySSC.Add("Eleven", "ijk")
      Catch e As ArgumentException
          Console.WriteLine(e.ToString())
      End Try

      Console.WriteLine()

      ' Searches the collection with Contains.
      Console.WriteLine("Contains ""Three"": {0}", mySSC.Contains("Three"))
      Console.WriteLine("Contains ""Twelve"": {0}", mySSC.Contains("Twelve"))
      Console.WriteLine()

      ' Removes an element from the collection.
      mySSC.Remove("Two")

      ' Displays the contents of the collection.
      Console.WriteLine("After removing ""Two"":")
      PrintKeysAndValues1(mySSC)

    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 ShortStringDictionary)
      Dim myDE As DictionaryEntry
      For Each myDE In  myCol
          Console.WriteLine("   {0,-5} : {1}", myDE.Key, myDE.Value)
      Next myDE
      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 ShortStringDictionary)
      Dim myDE As DictionaryEntry
      Dim myEnumerator As System.Collections.IEnumerator = myCol.GetEnumerator()
      While myEnumerator.MoveNext()
          If Not (myEnumerator.Current Is Nothing) Then
            myDE = CType(myEnumerator.Current, DictionaryEntry)
            Console.WriteLine("   {0,-5} : {1}", myDE.Key, myDE.Value)
          End If
      End While
      Console.WriteLine()
    End Sub


    ' Uses the Keys property and the Item property.
    Public Shared Sub PrintKeysAndValues3(myCol As ShortStringDictionary)
      Dim myKeys As ICollection = myCol.Keys
      Dim k As String
      For Each k In  myKeys
          Console.WriteLine("   {0,-5} : {1}", k, myCol(k))
      Next k
      Console.WriteLine()
    End Sub

End Class


'This code produces the following output.
'
'Contents of the collection (using For Each):
'   Three : abc
'   Five  : abcde
'   Two   : ab
'   One   : a
'   Four  : abcd
'
'Contents of the collection (using enumerator):
'   Three : abc
'   Five  : abcde
'   Two   : ab
'   One   : a
'   Four  : abcd
'
'Initial contents of the collection (using Keys and Item):
'   Three : abc
'   Five  : abcde
'   Two   : ab
'   One   : a
'   Four  : abcd
'
'System.ArgumentException: value must be no more than 5 characters in length.
'Parameter name: value
'   at ShortStringDictionary.OnValidate(Object key, Object value)
'   at System.Collections.DictionaryBase.System.Collections.IDictionary.Add(Object key, Object value)
'   at SamplesDictionaryBase.Main()
'System.ArgumentException: key must be no more than 5 characters in length.
'Parameter name: key
'   at ShortStringDictionary.OnValidate(Object key, Object value)
'   at System.Collections.DictionaryBase.System.Collections.IDictionary.Add(Object key, Object value)
'   at SamplesDictionaryBase.Main()
'
'Contains "Three": True
'Contains "Twelve": False
'
'After removing "Two":
'   Three : abc
'   Five  : abcde
'   One   : a
'   Four  : abcd

Hinweise

Wichtig

Es wird nicht empfohlen, die DictionaryBase-Klasse für die neue Entwicklung zu verwenden.We don't recommend that you use the DictionaryBase class for new development. Stattdessen wird empfohlen, dass Sie die generische Klasse Dictionary<TKey,TValue> oder KeyedCollection<TKey,TItem> verwenden.Instead, we recommend that you use the generic Dictionary<TKey,TValue> or KeyedCollection<TKey,TItem> class . Weitere Informationen finden Sie unter nicht generische Auflistungen sollten nicht auf GitHub verwendet werden.For more information, see Non-generic collections shouldn't be used on GitHub.

Die C# foreach -Anweisung und die Visual Basic für jede Anweisung geben ein Objekt vom Typ der Elemente in der Auflistung zurück.The C# foreach statement and the Visual Basic For Each statement return an object of the type of the elements in the collection. Da jedes Element des DictionaryBase ein Schlüssel-Wert-Paar ist, ist der Elementtyp nicht der Typ des Schlüssels oder der Typ des Werts.Since each element of the DictionaryBase is a key/value pair, the element type is not the type of the key or the type of the value. Stattdessen ist der Elementtyp DictionaryEntry.Instead, the element type is DictionaryEntry.

Bei der foreach-Anweisung handelt es sich um einen Wrapper um den Enumerator, der nur das Lesen von, das Schreiben in die Auflistung ermöglicht.The foreach statement is a wrapper around the enumerator, which only allows reading from, not writing to, the collection.

Hinweis

Da Schlüssel geerbt werden können und ihr Verhalten geändert wird, kann die absolute Eindeutigkeit nicht durch Vergleiche mithilfe der Equals-Methode garantiert werden.Because keys can be inherited and their behavior changed, their absolute uniqueness cannot be guaranteed by comparisons using the Equals method.

Hinweise für Vererber

Diese Basisklasse wird bereitgestellt, damit Implementierer eine stark typisierte benutzerdefinierte Auflistung erstellen kann.This base class is provided to make it easier for implementers to create a strongly typed custom collection. Implementierer wird empfohlen, diese Basisklasse zu erweitern, anstatt Sie zu erstellen.Implementers are encouraged to extend this base class instead of creating their own.

Member dieser Basisklasse sind geschützt und dienen ausschließlich der Verwendung durch eine abgeleitete Klasse.Members of this base class are protected and are intended to be used through a derived class only.

Konstruktoren

DictionaryBase()

Initialisiert eine neue Instanz der DictionaryBase-Klasse.Initializes a new instance of the DictionaryBase class.

Eigenschaften

Count

Ruft die Anzahl der Elemente ab, die in der DictionaryBase-Instanz enthalten sind.Gets the number of elements contained in the DictionaryBase instance.

Dictionary

Ruft die Liste der in der DictionaryBase-Instanz enthaltenen Elemente ab.Gets the list of elements contained in the DictionaryBase instance.

InnerHashtable

Ruft die Liste der in der DictionaryBase-Instanz enthaltenen Elemente ab.Gets the list of elements contained in the DictionaryBase instance.

Methoden

Clear()

Löscht den Inhalt der DictionaryBase-Instanz.Clears the contents of the DictionaryBase instance.

CopyTo(Array, Int32)

Kopiert die DictionaryBase-Elemente am angegebenen Index in ein eindimensionales Array.Copies the DictionaryBase elements to a one-dimensional Array at the specified index.

Equals(Object)

Bestimmt, ob das angegebene Objekt mit dem aktuellen Objekt identisch ist.Determines whether the specified object is equal to the current object.

(Geerbt von Object)
GetEnumerator()

Gibt einen IDictionaryEnumerator zurück, der die DictionaryBase-Instanz durchläuft.Returns an IDictionaryEnumerator that iterates through the DictionaryBase instance.

GetHashCode()

Fungiert als Standardhashfunktion.Serves as the default hash function.

(Geerbt von Object)
GetType()

Ruft den Type der aktuellen Instanz ab.Gets the Type of the current instance.

(Geerbt von Object)
MemberwiseClone()

Erstellt eine flache Kopie des aktuellen Object.Creates a shallow copy of the current Object.

(Geerbt von Object)
OnClear()

Führt vor dem Löschen des Inhalts der DictionaryBase-Instanz zusätzliche benutzerdefinierte Prozesse aus.Performs additional custom processes before clearing the contents of the DictionaryBase instance.

OnClearComplete()

Führt nach dem Löschen des Inhalts der DictionaryBase-Instanz zusätzliche benutzerdefinierte Prozesse aus.Performs additional custom processes after clearing the contents of the DictionaryBase instance.

OnGet(Object, Object)

Ruft das Element mit dem angegebenen Schlüssel und Wert aus der DictionaryBase-Instanz ab.Gets the element with the specified key and value in the DictionaryBase instance.

OnInsert(Object, Object)

Führt zusätzliche benutzerdefinierte Prozesse vor dem Einfügen eines neuen Elements in die DictionaryBase-Instanz aus.Performs additional custom processes before inserting a new element into the DictionaryBase instance.

OnInsertComplete(Object, Object)

Führt zusätzliche benutzerdefinierte Prozesse nach dem Einfügen eines neuen Elements in die DictionaryBase-Instanz aus.Performs additional custom processes after inserting a new element into the DictionaryBase instance.

OnRemove(Object, Object)

Führt zusätzliche benutzerdefinierte Prozesse vor dem Entfernen eines Elements aus der DictionaryBase-Instanz aus.Performs additional custom processes before removing an element from the DictionaryBase instance.

OnRemoveComplete(Object, Object)

Führt zusätzliche benutzerdefinierte Prozesse nach dem Entfernen eines Elements aus der DictionaryBase-Instanz aus.Performs additional custom processes after removing an element from the DictionaryBase instance.

OnSet(Object, Object, Object)

Führt zusätzliche benutzerdefinierte Prozesse vor dem Festlegen eines Werts in der DictionaryBase-Instanz aus.Performs additional custom processes before setting a value in the DictionaryBase instance.

OnSetComplete(Object, Object, Object)

Führt zusätzliche benutzerdefinierte Prozesse nach dem Festlegen eines Werts in der DictionaryBase-Instanz aus.Performs additional custom processes after setting a value in the DictionaryBase instance.

OnValidate(Object, Object)

Führt bei der Überprüfung des Elements mit dem angegebenen Schlüssel und Wert zusätzliche benutzerdefinierte Aktionen aus.Performs additional custom processes when validating the element with the specified key and value.

ToString()

Gibt eine Zeichenfolge zurück, die das aktuelle Objekt darstellt.Returns a string that represents the current object.

(Geerbt von Object)

Explizite Schnittstellenimplementierungen

ICollection.IsSynchronized

Ruft einen Wert ab, der angibt, ob der Zugriff auf ein DictionaryBase-Objekt synchronisiert (threadsicher) ist.Gets a value indicating whether access to a DictionaryBase object is synchronized (thread safe).

ICollection.SyncRoot

Ruft ein Objekt ab, mit dem der Zugriff auf ein DictionaryBase-Objekt synchronisiert werden kann.Gets an object that can be used to synchronize access to a DictionaryBase object.

IDictionary.Add(Object, Object)

Fügt dem DictionaryBase ein Element mit dem angegebenen Schlüssel und Wert hinzu.Adds an element with the specified key and value into the DictionaryBase.

IDictionary.Contains(Object)

Stellt fest, ob der DictionaryBase einen bestimmten Schlüssel enthält.Determines whether the DictionaryBase contains a specific key.

IDictionary.IsFixedSize

Ruft einen Wert ab, der angibt, ob ein DictionaryBase-Objekt eine feste Größe hat.Gets a value indicating whether a DictionaryBase object has a fixed size.

IDictionary.IsReadOnly

Ruft einen Wert ab, der angibt, ob ein DictionaryBase-Objekt schreibgeschützt ist.Gets a value indicating whether a DictionaryBase object is read-only.

IDictionary.Item[Object]

Ruft den Wert ab, der dem angegebenen Schlüssel zugeordnet ist, oder legt diesen fest.Gets or sets the value associated with the specified key.

IDictionary.Keys

Ruft ein ICollection-Objekt ab, das die Schlüssel im DictionaryBase-Objekt enthält.Gets an ICollection object containing the keys in the DictionaryBase object.

IDictionary.Remove(Object)

Entfernt das Element mit dem angegebenen Schlüssel aus dem DictionaryBase.Removes the element with the specified key from the DictionaryBase.

IDictionary.Values

Ruft ein ICollection-Objekt ab, das die Werte des DictionaryBase-Objekts enthält.Gets an ICollection object containing the values in the DictionaryBase object.

IEnumerable.GetEnumerator()

Gibt einen IEnumerator zurück, der DictionaryBase durchläuft.Returns an IEnumerator that iterates through the DictionaryBase.

Erweiterungsmethoden

Cast<TResult>(IEnumerable)

Wandelt die Elemente eines IEnumerable in den angegebenen Typ umCasts the elements of an IEnumerable to the specified type.

OfType<TResult>(IEnumerable)

Filtert die Elemente eines IEnumerable anhand eines angegebenen TypsFilters the elements of an IEnumerable based on a specified type.

AsParallel(IEnumerable)

Ermöglicht die Parallelisierung einer Abfrage.Enables parallelization of a query.

AsQueryable(IEnumerable)

Konvertiert einen IEnumerable in einen IQueryable.Converts an IEnumerable to an IQueryable.

Gilt für:

Threadsicherheit

Öffentliche statische (Shared in Visual Basic) Member dieses Typs sind Thread sicher.Public static (Shared in Visual Basic) members of this type are thread safe. Bei Instanzmembern ist die Threadsicherheit nicht gewährleistet.Any instance members are not guaranteed to be thread safe.

Diese Implementierung stellt keinen synchronisierten (Thread sicheren) Wrapper für eine DictionaryBase bereit, aber abgeleitete Klassen können mithilfe der SyncRoot-Eigenschaft eigene synchronisierte Versionen von DictionaryBase erstellen.This implementation does not provide a synchronized (thread-safe) wrapper for a DictionaryBase, but derived classes can create their own synchronized versions of the DictionaryBase using the SyncRoot property.

Die Enumeration einer Auflistung ist systemintern keine threadsichere Prozedur.Enumerating through a collection is intrinsically not a thread-safe procedure. Selbst wenn eine Auflistung synchronisiert wird, besteht die Möglichkeit, dass andere Threads sie ändern. Dies führt dazu, dass der Enumerator eine Ausnahme auslöst.Even when a collection is synchronized, other threads can still modify the collection, which causes the enumerator to throw an exception. Um während der Enumeration Threadsicherheit zu gewährleisten, können Sie entweder die Auflistung während der gesamten Enumeration sperren oder die Ausnahmen, die aus von anderen Threads stammenden Änderungen resultieren, abfangen.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.

Siehe auch