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

定义

请求系统调用指定对象的终结器,此前已为该对象调用 SuppressFinalize(Object)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)

参数

obj
Object Object Object Object

必须为其调用终结器的对象。The object that a finalizer must be called for.

异常

示例

下面的示例演示如何使用 ReRegisterForFinalize 方法在垃圾回收后第二次完成一个对象。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");
            }
        }
    }
}
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

注解

@No__t-0 方法将 @no__t 1 参数添加到在垃圾回收器释放对象之前请求终止的对象的列表中。The ReRegisterForFinalize method adds the obj parameter to the list of objects that request finalization before the garbage collector frees the object. @No__t 的参数必须是此方法的调用方。The obj parameter must be the caller of this method.

调用 ReRegisterForFinalize 方法并不保证垃圾回收器将调用对象的终结器。Calling the ReRegisterForFinalize method does not guarantee that the garbage collector will call an object's finalizer.

默认情况下,实现终结器的所有对象都将添加到需要完成的对象列表中;但是,对象可能已经完成了,或者通过调用 @no__t 0 方法禁用了终止。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.

终结器可以使用此方法恢复自身或其引用的对象。A finalizer can use this method to resurrect itself or an object that it references.

适用于

另请参阅