Object.Finalize Metode

Definisi

Ruang nama:

System

Rakitan:

System.Runtime.dll

Sumber:

Object.cs

Memungkinkan objek untuk mencoba membebaskan sumber daya dan melakukan operasi pembersihan lainnya sebelum diklaim kembali oleh pengumpulan sampah.

!Object ()

~Object ();

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

Finalize ()

Contoh

Contoh berikut memverifikasi bahwa metode dipanggil Finalize ketika objek yang mengambil alih Finalize dihancurkan. Perhatikan bahwa, dalam aplikasi produksi, Finalize metode akan ditimpa untuk merilis sumber daya yang tidak dikelola yang dipegang oleh objek . Perhatikan juga bahwa contoh C# menyediakan destruktor alih-alih menimpa Finalize metode .

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

Untuk contoh tambahan yang mengambil alih Finalize metode , lihat GC.SuppressFinalize metode .

Keterangan

Untuk informasi selengkapnya tentang API ini, lihat Keterangan API Tambahan untuk Object.Finalize.

Lihat juga

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