GC.GetGeneration Método

  • Referencia

Definición

Espacio de nombres:
System
Ensamblado:
System.Runtime.dll
Ensamblado:
mscorlib.dll
Ensamblado:
netstandard.dll

Devuelve el número de generación actual de un objeto.

Sobrecargas

GetGeneration(Object)

Devuelve el número de generación actual del objeto especificado.
GetGeneration(WeakReference)

Devuelve el número de generación actual del destino de una referencia débil especificada.

GetGeneration(Object)

Source:
GC.cs
Source:
GC.cs
Source:
GC.cs

Devuelve el número de generación actual del objeto especificado.

public:
 static int GetGeneration(System::Object ^ obj);
public static int GetGeneration (object obj);
static member GetGeneration : obj -> int
Public Shared Function GetGeneration (obj As Object) As Integer

Parámetros

obj
Object

El objeto cuya información sobre generación se recupera.

Devoluciones

Int32

Número de generación actual de obj, o Int32.MaxValue.

Ejemplos

En el ejemplo siguiente se muestra cómo usar el GetGeneration método para determinar la antigüedad de un objeto. A continuación, en el ejemplo se realizan recolecciones de elementos no utilizados para limpiar la memoria y comparar los totales de memoria anteriores y posteriores a la recopilación en la consola.

using namespace System;
const long maxGarbage = 1000;
ref class MyGCCollectClass
{
public:
   void MakeSomeGarbage()
   {
      Version^ vt;
      for ( int i = 0; i < maxGarbage; i++ )
      {
         
         // Create objects and release them to fill up memory
         // with unused objects.
         vt = gcnew Version;

      }
   }

};

int main()
{
   MyGCCollectClass^ myGCCol = gcnew MyGCCollectClass;
   
   // Determine the maximum number of generations the system
   // garbage collector currently supports.
   Console::WriteLine( "The highest generation is {0}", GC::MaxGeneration );
   myGCCol->MakeSomeGarbage();
   
   // Determine which generation myGCCol object is stored in.
   Console::WriteLine( "Generation: {0}", GC::GetGeneration( myGCCol ) );
   
   // Determine the best available approximation of the number
   // of bytes currently allocated in managed memory.
   Console::WriteLine( "Total Memory: {0}", GC::GetTotalMemory( false ) );
   
   // Perform a collection of generation 0 only.
   GC::Collect( 0 );
   
   // Determine which generation myGCCol object is stored in.
   Console::WriteLine( "Generation: {0}", GC::GetGeneration( myGCCol ) );
   Console::WriteLine( "Total Memory: {0}", GC::GetTotalMemory( false ) );
   
   // Perform a collection of all generations up to and including 2.
   GC::Collect( 2 );
   
   // Determine which generation myGCCol object is stored in.
   Console::WriteLine( "Generation: {0}", GC::GetGeneration( myGCCol ) );
   Console::WriteLine( "Total Memory: {0}", GC::GetTotalMemory( false ) );
}

using System;

namespace GCCollectIntExample
{
    class MyGCCollectClass
    {
        private const long maxGarbage = 1000;

        static void Main()
        {
            MyGCCollectClass myGCCol = new MyGCCollectClass();

            // Determine the maximum number of generations the system
        // garbage collector currently supports.
            Console.WriteLine("The highest generation is {0}", GC.MaxGeneration);

            myGCCol.MakeSomeGarbage();

            // Determine which generation myGCCol object is stored in.
            Console.WriteLine("Generation: {0}", GC.GetGeneration(myGCCol));

            // Determine the best available approximation of the number
        // of bytes currently allocated in managed memory.
            Console.WriteLine("Total Memory: {0}", GC.GetTotalMemory(false));

            // Perform a collection of generation 0 only.
            GC.Collect(0);

            // Determine which generation myGCCol object is stored in.
            Console.WriteLine("Generation: {0}", GC.GetGeneration(myGCCol));

            Console.WriteLine("Total Memory: {0}", GC.GetTotalMemory(false));

            // Perform a collection of all generations up to and including 2.
            GC.Collect(2);

            // Determine which generation myGCCol object is stored in.
            Console.WriteLine("Generation: {0}", GC.GetGeneration(myGCCol));
            Console.WriteLine("Total Memory: {0}", GC.GetTotalMemory(false));
            Console.Read();
        }

        void MakeSomeGarbage()
        {
            Version vt;

            for(int i = 0; i < maxGarbage; i++)
            {
                // Create objects and release them to fill up memory
        // with unused objects.
                vt = new Version();
            }
        }
    }
}

open System

let maxGarbage = 1000

type MyGCCollectClass() =
    member _.MakeSomeGarbage() =
        for _ = 1 to maxGarbage do
            // Create objects and release them to fill up memory with unused objects.
            Version() |> ignore

[<EntryPoint>]
let main _ =
    let myGCCol = MyGCCollectClass()

    // Determine the maximum number of generations the system
    // garbage collector currently supports.
    printfn $"The highest generation is {GC.MaxGeneration}"

    myGCCol.MakeSomeGarbage()

    // Determine which generation myGCCol object is stored in.
    printfn $"Generation: {GC.GetGeneration myGCCol}"

    // Determine the best available approximation of the number
    // of bytes currently allocated in managed memory.
    printfn $"Total Memory: {GC.GetTotalMemory false}"

    // Perform a collection of generation 0 only.
    GC.Collect 0

    // Determine which generation myGCCol object is stored in.
    printfn $"Generation: {GC.GetGeneration myGCCol}"

    printfn $"Total Memory: {GC.GetTotalMemory false}"

    // Perform a collection of all generations up to and including 2.
    GC.Collect 2

    // Determine which generation myGCCol object is stored in.
    printfn $"Generation: {GC.GetGeneration myGCCol}"
    printfn $"Total Memory: {GC.GetTotalMemory false}"

    0

Namespace GCCollectInt_Example
    Class MyGCCollectClass
        Private maxGarbage As Long = 10000

        Public Shared Sub Main()
            Dim myGCCol As New MyGCCollectClass

            'Determine the maximum number of generations the system
            'garbage collector currently supports.
            Console.WriteLine("The highest generation is {0}", GC.MaxGeneration)

            myGCCol.MakeSomeGarbage()

            'Determine which generation myGCCol object is stored in.
            Console.WriteLine("Generation: {0}", GC.GetGeneration(myGCCol))

            'Determine the best available approximation of the number 
            'of bytes currently allocated in managed memory.
            Console.WriteLine("Total Memory: {0}", GC.GetTotalMemory(False))

            'Perform a collection of generation 0 only.
            GC.Collect(0)

            'Determine which generation myGCCol object is stored in.
            Console.WriteLine("Generation: {0}", GC.GetGeneration(myGCCol))

            Console.WriteLine("Total Memory: {0}", GC.GetTotalMemory(False))

            'Perform a collection of all generations up to and including 2.
            GC.Collect(2)

            'Determine which generation myGCCol object is stored in.
            Console.WriteLine("Generation: {0}", GC.GetGeneration(myGCCol))
            Console.WriteLine("Total Memory: {0}", GC.GetTotalMemory(False))
            Console.Read()

        End Sub


        Sub MakeSomeGarbage()
            Dim vt As Version

            Dim i As Integer
            For i = 0 To maxGarbage - 1
                'Create objects and release them to fill up memory
                'with unused objects.
                vt = New Version
            Next i
        End Sub
    End Class
End Namespace

Comentarios

Utilice este método para determinar la antigüedad de un objeto y, a continuación, use esa información con el Collect método para forzar al recolector de elementos no utilizados a recopilar objetos en la misma generación. Por ejemplo, use este método cuando tenga un conjunto de objetos creados como un grupo y que se vuelvan inaccesibles al mismo tiempo.

A partir de .NET 8, este método podría devolver MaxValue objetos asignados en montones que no son gc. Para obtener más información, consulte GC. GetGeneration podría devolver Int32.MaxValue.

Consulte también

Se aplica a

GetGeneration(WeakReference)

Source:
GC.CoreCLR.cs
Source:
GC.CoreCLR.cs
Source:
GC.CoreCLR.cs

Devuelve el número de generación actual del destino de una referencia débil especificada.

public:
 static int GetGeneration(WeakReference ^ wo);
public static int GetGeneration (WeakReference wo);
static member GetGeneration : WeakReference -> int
Public Shared Function GetGeneration (wo As WeakReference) As Integer

Parámetros

wo
WeakReference

Un WeakReference que hace referencia al objeto de destino cuyo número de generación debe determinarse.

Devoluciones

Int32

Número de generación actual del destino de wo, o MaxValue.

Excepciones

ArgumentException

Ya se ha realizado la recolección de elementos no utilizados en wo.

ArgumentNullException

El destino de la referencia débil ya se ha recolectado como elemento no utilizado.

Ejemplos

En el ejemplo siguiente se muestra el uso del GetGeneration método para determinar la antigüedad de un objeto de referencia débil.

using namespace System;
ref class MyGCCollectClass
{
private:
   static const long maxGarbage = 1000;

public:
   void MakeSomeGarbage()
   {
      Version^ vt;
      for ( int i = 0; i < maxGarbage; i++ )
      {
         
         // Create objects and release them to fill up memory
         // with unused objects.
         vt = gcnew Version;

      }
   }

};

int main()
{
   
   // Create a strong reference to an Object.
   MyGCCollectClass^ myGCCol = gcnew MyGCCollectClass;
   
   // Put some objects in memory.
   myGCCol->MakeSomeGarbage();
   
   // Get the generation of managed memory where myGCCol is stored.
   Console::WriteLine( "The object is in generation: {0}", GC::GetGeneration( myGCCol ) );
   
   // Perform a full garbage collection.
   // Because there is a strong reference to myGCCol, it will
   // not be garbage collected.
   GC::Collect();
   
   // Get the generation of managed memory where myGCCol is stored.
   Console::WriteLine( "The object is in generation: {0}", GC::GetGeneration( myGCCol ) );
   
   // Create a WeakReference to myGCCol.
   WeakReference^ wkref = gcnew WeakReference( myGCCol );
   
   // Remove the strong reference to myGCCol.
   myGCCol = nullptr;
   
   // Get the generation of managed memory where wkref is stored.
   Console::WriteLine( "The WeakReference to the object is in generation: {0}", GC::GetGeneration( wkref ) );
   
   // Perform another full garbage collection.
   // A WeakReference will not survive a garbage collection.
   GC::Collect();
   
   // Try to get the generation of managed memory where wkref is stored.
   // Because it has been collected, an exception will be thrown.
   try
   {
      Console::WriteLine( "The WeakReference to the object is in generation: {0}", GC::GetGeneration( wkref ) );
      Console::Read();
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( "The WeakReference to the object has been garbage collected: ' {0}'", e );
   }

}

using System;

namespace GCGetGenerationWeakExample
{
    public class MyGCCollectClass
    {
        private const long maxGarbage = 1000;

        static void Main()
        {
            // Create a strong reference to an object.
            MyGCCollectClass myGCCol = new MyGCCollectClass();

            // Put some objects in memory.
            myGCCol.MakeSomeGarbage();

            // Get the generation of managed memory where myGCCol is stored.
            Console.WriteLine("The object is in generation: {0}", GC.GetGeneration(myGCCol));
                        
            // Perform a full garbage collection.
            // Because there is a strong reference to myGCCol, it will
            // not be garbage collected.
            GC.Collect();
            
            // Get the generation of managed memory where myGCCol is stored.
            Console.WriteLine("The object is in generation: {0}", GC.GetGeneration(myGCCol));
            
            // Create a WeakReference to myGCCol.
            WeakReference wkref = new WeakReference(myGCCol);
            // Remove the strong reference to myGCCol.
            myGCCol = null;

            // Get the generation of managed memory where wkref is stored.
            Console.WriteLine("The WeakReference to the object is in generation: {0}", GC.GetGeneration(wkref));
            
            // Perform another full garbage collection.
            // A WeakReference will not survive a garbage collection.
            GC.Collect();
        
            // Try to get the generation of managed memory where wkref is stored.
            // Because it has been collected, an exception will be thrown.
            try
            {
                Console.WriteLine("The WeakReference to the object is in generation: {0}", GC.GetGeneration(wkref));
                Console.Read();
            }
            catch(Exception e)
            {
                Console.WriteLine("The WeakReference to the object has been garbage collected: '{0}'", e);
                Console.Read();
            }
        }

        void MakeSomeGarbage()
        {
            Version vt;

            for(int i = 0; i < maxGarbage; i++)
            {
                // Create objects and release them to fill up memory
                // with unused objects.
                vt = new Version();
            }
        }
    }
}

open System

let maxGarbage = 1000

[<AllowNullLiteral>]
type MyGCCollectClass() =
    member _.MakeSomeGarbage() =
        for i = 1 to maxGarbage do
            // Create objects and release them to fill up memory
            // with unused objects.
            Version() |> ignore

// Create a strong reference to an object.
let mutable myGCCol = MyGCCollectClass()

// Put some objects in memory.
myGCCol.MakeSomeGarbage()

// Get the generation of managed memory where myGCCol is stored.
printfn $"The object is in generation: {GC.GetGeneration myGCCol}"
            
// Perform a full garbage collection.
// Because there is a strong reference to myGCCol, it will
// not be garbage collected.
GC.Collect()

// Get the generation of managed memory where myGCCol is stored.
printfn $"The object is in generation: {GC.GetGeneration myGCCol}"

// Create a WeakReference to myGCCol.
let wkref = WeakReference myGCCol
// Remove the strong reference to myGCCol.
myGCCol <- null

// Get the generation of managed memory where wkref is stored.
printfn $"The WeakReference to the object is in generation: {GC.GetGeneration wkref}"

// Perform another full garbage collection.
// A WeakReference will not survive a garbage collection.
GC.Collect()

// Try to get the generation of managed memory where wkref is stored.
// Because it has been collected, an exception will be thrown.
try
    printfn $"The WeakReference to the object is in generation: {GC.GetGeneration wkref}"
    stdin.Read() |> ignore
with e ->
    printfn $"The WeakReference to the object has been garbage collected: '{e}'"
    stdin.Read() |> ignore

Namespace GCGetGenerationWeakExample

   Class MyGCCollectClass
      Private maxGarbage As Long = 1000

      Public Shared Sub Main()
         ' Create a strong reference to an object.
         Dim myGCCol As New MyGCCollectClass

         ' Put some objects in memory.
         myGCCol.MakeSomeGarbage()

         ' Get the generation of managed memory where myGCCol is stored.
         Console.WriteLine("The object is in generation: {0}", _
                            GC.GetGeneration(myGCCol))

         ' Perform a full garbage collection.
         ' Because there is a strong reference to myGCCol, it will
         ' not be garbage collected.
         GC.Collect()

         ' Get the generation of managed memory where myGCCol is stored.
         Console.WriteLine("The object is in generation: {0}", _
                            GC.GetGeneration(myGCCol))

         ' Create a WeakReference to myGCCol.
         Dim wkref As New WeakReference(myGCCol)
         ' Remove the strong reference to myGCCol.
         myGCCol = Nothing

         ' Get the generation of managed memory where wkref is stored.
         Console.WriteLine("The WeakReference to the object is in generation: {0}", _
                           GC.GetGeneration(wkref))

         ' Perform another full garbage collection.
         ' A WeakReference will not survive a garbage collection.
         GC.Collect()

         ' Try to get the generation of managed memory where wkref is stored.
         ' Because it has been collected, an exception will be thrown.
         Try
            Console.WriteLine("The WeakReference to the object is in generation: {0}", _
                               GC.GetGeneration(wkref))
            Console.Read()
         Catch e As Exception
            Console.WriteLine("The WeakReference to the object " & _
                              "has been garbage collected: '{0}'", e)
            Console.Read()
         End Try
      End Sub


      Sub MakeSomeGarbage()
         Dim vt As Version

         Dim i As Integer
         For i = 0 To maxGarbage - 1
            ' Create objects and release them to fill up memory
            ' with unused objects.
            vt = New Version
         Next i
      End Sub
   End Class
End Namespace

Comentarios

A partir de .NET 8, este método podría devolver MaxValue objetos asignados en montones que no son gc. Para obtener más información, consulte GC. GetGeneration podría devolver Int32.MaxValue.

Consulte también

Se aplica a