GC.ReRegisterForFinalize(Object) GC.ReRegisterForFinalize(Object) GC.ReRegisterForFinalize(Object) GC.ReRegisterForFinalize(Object) Method

Definition

Fordert beim System den Aufruf des Finalizers für das angegebene Objekt an, für das zuvor SuppressFinalize(Object) aufgerufen wurde.Requests that the system call the finalizer for the specified object for which SuppressFinalize(Object) has previously been called.

public:
 static void ReRegisterForFinalize(System::Object ^ obj);
public static void ReRegisterForFinalize (object obj);
static member ReRegisterForFinalize : obj -> unit
Public Shared Sub ReRegisterForFinalize (obj As Object)

Parameter

obj
Object Object Object Object

Das Objekt, für das ein Finalizer aufgerufen werden muss.The object that a finalizer must be called for.

Ausnahmen

Beispiele

Im folgende Beispiel wird veranschaulicht, wie Sie die ReRegisterForFinalize-Methode verwenden, um ein Objekt ein zweites abzuschließen Zeit nach der Garbagecollection.The following example demonstrates how to use the ReRegisterForFinalize method to finalize an object a second time after garbage collection.

using namespace System;
ref class MyFinalizeObject
{
public:
   static MyFinalizeObject^ currentInstance = nullptr;

private:
   bool hasFinalized;

public:
   MyFinalizeObject()
   {
      hasFinalized = false;
   }

   ~MyFinalizeObject()
   {
      if ( hasFinalized == false )
      {
         Console::WriteLine( "First finalization" );
         
         // Put this object back into a root by creating
         // a reference to it.
         MyFinalizeObject::currentInstance = this;
         
         // Indicate that this instance has finalized once.
         hasFinalized = true;
         
         // Place a reference to this object back in the
         // finalization queue.
         GC::ReRegisterForFinalize( this );
      }
      else
      {
         Console::WriteLine( "Second finalization" );
      }
   }

};

int main()
{
   
   // Create a MyFinalizeObject.
   MyFinalizeObject^ mfo = gcnew MyFinalizeObject;
   
   // Release the reference to mfo.
   mfo = nullptr;
   
   // Force a garbage collection.
   GC::Collect();
   
   // At this point mfo will have gone through the first Finalize.
   // There should now be a reference to mfo in the static
   // MyFinalizeObject::currentInstance field.  Setting this value
   // to 0 and forcing another garbage collection will now
   // cause the object to Finalize permanently.
   MyFinalizeObject::currentInstance = nullptr;
   GC::Collect();
}

using System;

namespace ReRegisterForFinalizeExample
{
    class MyMainClass
    {
        static void Main()
        {
            // Create a MyFinalizeObject.
            MyFinalizeObject mfo = new MyFinalizeObject();

            // Release the reference to mfo.
            mfo = null;

            // Force a garbage collection.
            GC.Collect();

            // At this point mfo will have gone through the first Finalize.
            // There should now be a reference to mfo in the static
            // MyFinalizeObject.currentInstance field.  Setting this value
            // to null and forcing another garbage collection will now
            // cause the object to Finalize permanently.
            MyFinalizeObject.currentInstance = null;
            GC.Collect();
        }
    }

    class MyFinalizeObject
    {
        public static MyFinalizeObject currentInstance = null;
        private bool hasFinalized = false;

        ~MyFinalizeObject()
        {
            if(hasFinalized == false)
            {
                Console.WriteLine("First finalization");
            
                // Put this object back into a root by creating
                // a reference to it.
                MyFinalizeObject.currentInstance = this;
            
                // Indicate that this instance has finalized once.
                hasFinalized = true;

                // Place a reference to this object back in the
                // finalization queue.
                GC.ReRegisterForFinalize(this);
            }
            else
            {
                Console.WriteLine("Second finalization");
            }
        }
    }
}
Imports System

Namespace ReRegisterForFinalizeExample
    Class MyMainClass
        Shared Sub Main()
            'Create a MyFinalizeObject.
            Dim mfo As New MyFinalizeObject()

            'Release the reference to mfo.
            mfo = Nothing

            'Force a garbage collection.
            GC.Collect()

            'At this point mfo will have gone through the first Finalize.
            'There should now be a reference to mfo in the static
            'MyFinalizeObject.currentInstance field.  Setting this value
            'to null and forcing another garbage collection will now
            'cause the object to Finalize permanently.
            MyFinalizeObject.currentInstance = Nothing
            GC.Collect()
        End Sub
    End Class

    Class MyFinalizeObject
        Public Shared currentInstance As MyFinalizeObject = Nothing
        Private hasFinalized As Boolean = False

        Protected Overrides Sub Finalize()
            If hasFinalized = False Then
                Console.WriteLine("First finalization")

                'Put this object back into a root by creating
                'a reference to it.
                MyFinalizeObject.currentInstance = Me

                'Indicate that this instance has finalized once.
                hasFinalized = True

                'Place a reference to this object back in the
                'finalization queue.
                GC.ReRegisterForFinalize(Me)
            Else
                Console.WriteLine("Second finalization")
            End If
            MyBase.Finalize()
        End Sub
    End Class
End Namespace

Hinweise

Die ReRegisterForFinalize Methode fügt die obj Parameter, um die Liste der Objekte, die Finalisierung anfordern, bevor der Garbage Collector das Objekt freigibt.The ReRegisterForFinalize method adds the obj parameter to the list of objects that request finalization before the garbage collector frees the object. Die obj -Parameter muss der Aufrufer dieser Methode sein.The obj parameter must be the caller of this method.

Aufrufen der ReRegisterForFinalize -Methode garantiert nicht, dass der Garbage Collector den Finalizer des Objekts aufruft.Calling the ReRegisterForFinalize method does not guarantee that the garbage collector will call an object's finalizer.

Standardmäßig werden alle Objekte, die Finalizer zu implementieren die Liste der Objekte hinzugefügt, für die Finalisierung erforderlich; jedoch ein Objekt möglicherweise bereits abgeschlossen oder der Beendigung kann durch Aufrufen von deaktiviert die SuppressFinalize Methode.By default, all objects that implement finalizers are added to the list of objects that require finalization; however, an object might have already been finalized or might have disabled finalization by calling the SuppressFinalize method.

Finalizer kann diese Methode verwenden, um zu erwecken, sich selbst oder auf ein Objekt, das darauf verweist.A finalizer can use this method to resurrect itself or an object that it references.

Gilt für:

Siehe auch