Object.Finalize Metodo

Definizione

Spazio dei nomi:

System

Assembly:

System.Runtime.dll

Origine:

Object.cs

Consente a un oggetto di effettuare un tentativo di liberare risorse ed eseguire altre operazioni di pulizia prima che venga recuperato da Garbage Collection.

!Object ()

~Object ();

abstract member Finalize : unit -> unit
override this.Finalize : unit -> unit

Finalize ()

Esempio

Nell'esempio seguente viene verificato che il Finalize metodo venga chiamato quando un oggetto che esegue l'override Finalize viene eliminato definitivamente. Si noti che, in un'applicazione di produzione, il Finalize metodo verrà sottoposto a override per rilasciare risorse non gestite mantenute dall'oggetto . Si noti anche che l'esempio C# fornisce un distruttore anziché eseguire l'override del Finalize metodo .

using System;
using System.Diagnostics;

public class ExampleClass
{
   Stopwatch sw;

   public ExampleClass()
   {
      sw = Stopwatch.StartNew();
      Console.WriteLine("Instantiated object");
   }

   public void ShowDuration()
   {
      Console.WriteLine("This instance of {0} has been in existence for {1}",
                        this, sw.Elapsed);
   }

   ~ExampleClass()
   {
      Console.WriteLine("Finalizing object");
      sw.Stop();
      Console.WriteLine("This instance of {0} has been in existence for {1}",
                        this, sw.Elapsed);
   }
}

public class Demo
{
   public static void Main()
   {
      ExampleClass ex = new ExampleClass();
      ex.ShowDuration();
   }
}
// The example displays output like the following:
//    Instantiated object
//    This instance of ExampleClass has been in existence for 00:00:00.0011060
//    Finalizing object
//    This instance of ExampleClass has been in existence for 00:00:00.0036294

open System.Diagnostics

type ExampleClass() =
    let sw = Stopwatch.StartNew()
    do 
        printfn "Instantiated object"

    member this.ShowDuration() =
        printfn $"This instance of {this} has been in existence for {sw.Elapsed}"

    override this.Finalize() =
        printfn "Finalizing object"
        sw.Stop()
        printfn $"This instance of {this} has been in existence for {sw.Elapsed}"

let ex = ExampleClass()
ex.ShowDuration()
// The example displays output like the following:
//    Instantiated object
//    This instance of ExampleClass has been in existence for 00:00:00.0011060
//    Finalizing object
//    This instance of ExampleClass has been in existence for 00:00:00.0036294

Imports System.Diagnostics

Public Class ExampleClass
   Dim sw As StopWatch
   
   Public Sub New()
      sw = Stopwatch.StartNew()
      Console.WriteLine("Instantiated object")
   End Sub 

   Public Sub ShowDuration()
      Console.WriteLine("This instance of {0} has been in existence for {1}",
                        Me, sw.Elapsed)
   End Sub
   
   Protected Overrides Sub Finalize()
      Console.WriteLine("Finalizing object")
      sw.Stop()
      Console.WriteLine("This instance of {0} has been in existence for {1}",
                        Me, sw.Elapsed)
   End Sub
End Class

Module Demo
   Public Sub Main()
      Dim ex As New ExampleClass()
      ex.ShowDuration()
   End Sub
End Module
' The example displays output like the following:
'    Instantiated object
'    This instance of ExampleClass has been in existence for 00:00:00.0011060
'    Finalizing object
'    This instance of ExampleClass has been in existence for 00:00:00.0036294

Per un esempio aggiuntivo che esegue l'override del Finalize metodo , vedere il GC.SuppressFinalize metodo .

Commenti

Per altre informazioni su questa API, vedere Note sulle API supplementari per Object.Finalize.

Vedi anche

• SuppressFinalize(Object)
• ReRegisterForFinalize(Object)
• WaitForPendingFinalizers()
• WeakReference