AppDomain Classe

Definição

public ref class AppDomain sealed : MarshalByRefObject

public ref class AppDomain : MarshalByRefObject

public ref class AppDomain sealed : MarshalByRefObject, _AppDomain, System::Security::IEvidenceFactory

public sealed class AppDomain : MarshalByRefObject

public class AppDomain : MarshalByRefObject

[System.Runtime.InteropServices.ClassInterface(System.Runtime.InteropServices.ClassInterfaceType.None)]
public sealed class AppDomain : MarshalByRefObject, _AppDomain, System.Security.IEvidenceFactory

[System.Runtime.InteropServices.ClassInterface(System.Runtime.InteropServices.ClassInterfaceType.None)]
[System.Runtime.InteropServices.ComVisible(true)]
public sealed class AppDomain : MarshalByRefObject, _AppDomain, System.Security.IEvidenceFactory

type AppDomain = class
    inherit MarshalByRefObject

[<System.Runtime.InteropServices.ClassInterface(System.Runtime.InteropServices.ClassInterfaceType.None)>]
type AppDomain = class
    inherit MarshalByRefObject
    interface _AppDomain
    interface IEvidenceFactory

[<System.Runtime.InteropServices.ClassInterface(System.Runtime.InteropServices.ClassInterfaceType.None)>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type AppDomain = class
    inherit MarshalByRefObject
    interface _AppDomain
    interface IEvidenceFactory

Public NotInheritable Class AppDomain
Inherits MarshalByRefObject

Public Class AppDomain
Inherits MarshalByRefObject

Public NotInheritable Class AppDomain
Inherits MarshalByRefObject
Implements _AppDomain, IEvidenceFactory

Herança

Object

MarshalByRefObject

AppDomain

Atributos

ClassInterfaceAttribute ComVisibleAttribute

Implementações

_AppDomain IEvidenceFactory

Exemplos

Este exemplo mostra como criar uma nova AppDomaininstância de um tipo nesse novo AppDomaine se comunicar com o objeto desse tipo. Além disso, este exemplo mostra como descarregar a AppDomain causa da coleta de lixo do objeto.

using namespace System;
using namespace System::Reflection;
using namespace System::Threading;
using namespace System::Security::Policy;

// Because this class is derived from MarshalByRefObject, a proxy 
// to a MarshalByRefType object can be returned across an AppDomain 
// boundary.
ref class MarshalByRefType : MarshalByRefObject
{
public:
    //  Call this method via a proxy.
    void SomeMethod(String^ callingDomainName)
    {
        // Get this AppDomain's settings and display some of them.
        AppDomainSetup^ ads = AppDomain::CurrentDomain->SetupInformation;
        Console::WriteLine("AppName={0}, AppBase={1}, ConfigFile={2}", 
            ads->ApplicationName, 
            ads->ApplicationBase, 
            ads->ConfigurationFile
        );

        // Display the name of the calling AppDomain and the name 
        // of the second domain.
        // NOTE: The application's thread has transitioned between 
        // AppDomains.
        Console::WriteLine("Calling from '{0}' to '{1}'.", 
            callingDomainName, 
            Thread::GetDomain()->FriendlyName
        );
    };
};

void main()
{
    // Get and display the friendly name of the default AppDomain.
    String^ callingDomainName = Thread::GetDomain()->FriendlyName;
    Console::WriteLine(callingDomainName);

    // Get and display the full name of the EXE assembly.
    String^ exeAssembly = Assembly::GetEntryAssembly()->FullName;
    Console::WriteLine(exeAssembly);

    // Construct and initialize settings for a second AppDomain.
    AppDomainSetup^ ads = gcnew AppDomainSetup();
    ads->ApplicationBase = AppDomain::CurrentDomain->BaseDirectory;

    ads->DisallowBindingRedirects = false;
    ads->DisallowCodeDownload = true;
    ads->ConfigurationFile = 
        AppDomain::CurrentDomain->SetupInformation->ConfigurationFile;

    // Create the second AppDomain.
    AppDomain^ ad2 = AppDomain::CreateDomain("AD #2", 
        AppDomain::CurrentDomain->Evidence, ads);

    // Create an instance of MarshalbyRefType in the second AppDomain. 
    // A proxy to the object is returned.
    MarshalByRefType^ mbrt = 
        (MarshalByRefType^) ad2->CreateInstanceAndUnwrap(
            exeAssembly, 
            MarshalByRefType::typeid->FullName
        );

    // Call a method on the object via the proxy, passing the 
    // default AppDomain's friendly name in as a parameter.
    mbrt->SomeMethod(callingDomainName);

    // Unload the second AppDomain. This deletes its object and 
    // invalidates the proxy object.
    AppDomain::Unload(ad2);
    try
    {
        // Call the method again. Note that this time it fails 
        // because the second AppDomain was unloaded.
        mbrt->SomeMethod(callingDomainName);
        Console::WriteLine("Sucessful call.");
    }
    catch(AppDomainUnloadedException^)
    {
        Console::WriteLine("Failed call; this is expected.");
    }
}

/* This code produces output similar to the following: 

AppDomainX.exe
AppDomainX, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
AppName=, AppBase=C:\AppDomain\bin, ConfigFile=C:\AppDomain\bin\AppDomainX.exe.config
Calling from 'AppDomainX.exe' to 'AD #2'.
Failed call; this is expected.
 */

using System;
using System.Reflection;
using System.Threading;

class Module1
{
    public static void Main()
    {
        // Get and display the friendly name of the default AppDomain.
        string callingDomainName = Thread.GetDomain().FriendlyName;
        Console.WriteLine(callingDomainName);

        // Get and display the full name of the EXE assembly.
        string exeAssembly = Assembly.GetEntryAssembly().FullName;
        Console.WriteLine(exeAssembly);

        // Construct and initialize settings for a second AppDomain.
        AppDomainSetup ads = new AppDomainSetup();
        ads.ApplicationBase = AppDomain.CurrentDomain.BaseDirectory;

        ads.DisallowBindingRedirects = false;
        ads.DisallowCodeDownload = true;
        ads.ConfigurationFile =
            AppDomain.CurrentDomain.SetupInformation.ConfigurationFile;

        // Create the second AppDomain.
        AppDomain ad2 = AppDomain.CreateDomain("AD #2", null, ads);

        // Create an instance of MarshalbyRefType in the second AppDomain.
        // A proxy to the object is returned.
        MarshalByRefType mbrt =
            (MarshalByRefType) ad2.CreateInstanceAndUnwrap(
                exeAssembly,
                typeof(MarshalByRefType).FullName
            );

        // Call a method on the object via the proxy, passing the
        // default AppDomain's friendly name in as a parameter.
        mbrt.SomeMethod(callingDomainName);

        // Unload the second AppDomain. This deletes its object and
        // invalidates the proxy object.
        AppDomain.Unload(ad2);
        try
        {
            // Call the method again. Note that this time it fails
            // because the second AppDomain was unloaded.
            mbrt.SomeMethod(callingDomainName);
            Console.WriteLine("Sucessful call.");
        }
        catch(AppDomainUnloadedException)
        {
            Console.WriteLine("Failed call; this is expected.");
        }
    }
}

// Because this class is derived from MarshalByRefObject, a proxy
// to a MarshalByRefType object can be returned across an AppDomain
// boundary.
public class MarshalByRefType : MarshalByRefObject
{
    //  Call this method via a proxy.
    public void SomeMethod(string callingDomainName)
    {
        // Get this AppDomain's settings and display some of them.
        AppDomainSetup ads = AppDomain.CurrentDomain.SetupInformation;
        Console.WriteLine("AppName={0}, AppBase={1}, ConfigFile={2}",
            ads.ApplicationName,
            ads.ApplicationBase,
            ads.ConfigurationFile
        );

        // Display the name of the calling AppDomain and the name
        // of the second domain.
        // NOTE: The application's thread has transitioned between
        // AppDomains.
        Console.WriteLine("Calling from '{0}' to '{1}'.",
            callingDomainName,
            Thread.GetDomain().FriendlyName
        );
    }
}

/* This code produces output similar to the following:

AppDomainX.exe
AppDomainX, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
AppName=, AppBase=C:\AppDomain\bin, ConfigFile=C:\AppDomain\bin\AppDomainX.exe.config
Calling from 'AppDomainX.exe' to 'AD #2'.
Failed call; this is expected.
 */

open System
open System.Reflection
open System.Threading

// Because this class is derived from MarshalByRefObject, a proxy
// to a MarshalByRefType object can be returned across an AppDomain
// boundary.
type MarshalByRefType() =
    inherit MarshalByRefObject()
    
    //  Call this method via a proxy.
    member _.SomeMethod(callingDomainName) =
        // Get this AppDomain's settings and display some of them.
        let ads = AppDomain.CurrentDomain.SetupInformation
        printfn $"AppName={ads.ApplicationName}, AppBase={ads.ApplicationBase}, ConfigFile={ads.ConfigurationFile}"

        // Display the name of the calling AppDomain and the name
        // of the second domain.
        // NOTE: The application's thread has transitioned between
        // AppDomains.
        printfn $"Calling from '{callingDomainName}' to '{Thread.GetDomain().FriendlyName}'."

// Get and display the friendly name of the default AppDomain.
let callingDomainName = Thread.GetDomain().FriendlyName
printfn $"{callingDomainName}"

// Get and display the full name of the EXE assembly.
let exeAssembly = Assembly.GetEntryAssembly().FullName
printfn $"{exeAssembly}"

// Construct and initialize settings for a second AppDomain.
let ads = AppDomainSetup()
ads.ApplicationBase <- AppDomain.CurrentDomain.BaseDirectory

ads.DisallowBindingRedirects <- false
ads.DisallowCodeDownload <- true
ads.ConfigurationFile <-
    AppDomain.CurrentDomain.SetupInformation.ConfigurationFile

// Create the second AppDomain.
let ad2 = AppDomain.CreateDomain("AD #2", null, ads)

// Create an instance of MarshalbyRefType in the second AppDomain.
// A proxy to the object is returned.
let mbrt =
    ad2.CreateInstanceAndUnwrap(
        exeAssembly,
        typeof<MarshalByRefType>.FullName) :?> MarshalByRefType

// Call a method on the object via the proxy, passing the
// default AppDomain's friendly name in as a parameter.
mbrt.SomeMethod callingDomainName

// Unload the second AppDomain. This deletes its object and
// invalidates the proxy object.
AppDomain.Unload ad2
try
    // Call the method again. Note that this time it fails
    // because the second AppDomain was unloaded.
    mbrt.SomeMethod callingDomainName
    printfn "Sucessful call."
with :? AppDomainUnloadedException ->
    printfn "Failed call this is expected."

(* This code produces output similar to the following:

AppDomainX.exe
AppDomainX, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
AppName=, AppBase=C:\AppDomain\bin, ConfigFile=C:\AppDomain\bin\AppDomainX.exe.config
Calling from 'AppDomainX.exe' to 'AD #2'.
Failed call this is expected.
 *)

Imports System.Reflection
Imports System.Threading

Module Module1
    Sub Main()

        ' Get and display the friendly name of the default AppDomain.
        Dim callingDomainName As String = Thread.GetDomain().FriendlyName
        Console.WriteLine(callingDomainName)

        ' Get and display the full name of the EXE assembly.
        Dim exeAssembly As String = [Assembly].GetEntryAssembly().FullName
        Console.WriteLine(exeAssembly)

        ' Construct and initialize settings for a second AppDomain.
        Dim ads As New AppDomainSetup()
        ads.ApplicationBase = AppDomain.CurrentDomain.BaseDirectory
        ads.DisallowBindingRedirects = False
        ads.DisallowCodeDownload = True
        ads.ConfigurationFile = _
            AppDomain.CurrentDomain.SetupInformation.ConfigurationFile

        ' Create the second AppDomain.
        Dim ad2 As AppDomain = AppDomain.CreateDomain("AD #2", Nothing, ads)

        ' Create an instance of MarshalbyRefType in the second AppDomain. 
        ' A proxy to the object is returned.
        Dim mbrt As MarshalByRefType = CType( _
            ad2.CreateInstanceAndUnwrap(exeAssembly, _
                 GetType(MarshalByRefType).FullName), MarshalByRefType)

        ' Call a method on the object via the proxy, passing the default 
        ' AppDomain's friendly name in as a parameter.
        mbrt.SomeMethod(callingDomainName)

        ' Unload the second AppDomain. This deletes its object and 
        ' invalidates the proxy object.
        AppDomain.Unload(ad2)
        Try
            ' Call the method again. Note that this time it fails because 
            ' the second AppDomain was unloaded.
            mbrt.SomeMethod(callingDomainName)
            Console.WriteLine("Sucessful call.")
        Catch e As AppDomainUnloadedException
            Console.WriteLine("Failed call; this is expected.")
        End Try

    End Sub
End Module

' Because this class is derived from MarshalByRefObject, a proxy 
' to a MarshalByRefType object can be returned across an AppDomain 
' boundary.
Public Class MarshalByRefType
    Inherits MarshalByRefObject

    '  Call this method via a proxy.
    Public Sub SomeMethod(ByVal callingDomainName As String)

        ' Get this AppDomain's settings and display some of them.
        Dim ads As AppDomainSetup = AppDomain.CurrentDomain.SetupInformation
        Console.WriteLine("AppName={0}, AppBase={1}, ConfigFile={2}", _
            ads.ApplicationName, ads.ApplicationBase, ads.ConfigurationFile)

        ' Display the name of the calling AppDomain and the name 
        ' of the second domain.
        ' NOTE: The application's thread has transitioned between 
        ' AppDomains.
        Console.WriteLine("Calling from '{0}' to '{1}'.", _
            callingDomainName, Thread.GetDomain().FriendlyName)
    End Sub
End Class

'This code produces output similar to the following:
' 
' AppDomainX.exe
' AppDomainX, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
' AppName=, AppBase=C:\AppDomain\bin, ConfigFile=C:\AppDomain\bin\AppDomainX.exe.config
' Calling from 'AppDomainX.exe' to 'AD #2'.
' Failed call; this is expected.

Comentários

Os domínios de aplicativo, que são representados por AppDomain objetos, ajudam a fornecer limites de isolamento, descarregamento e segurança para a execução de código gerenciado.

• Use domínios de aplicativo para isolar tarefas que podem derrubar um processo. Se o estado do AppDomain que está executando uma tarefa se tornar instável, ele AppDomain poderá ser descarregado sem afetar o processo. Isso é importante quando um processo deve ser executado por longos períodos sem reiniciar. Você também pode usar domínios de aplicativo para isolar tarefas que não devem compartilhar dados.
• Se um assembly for carregado no domínio de aplicativo padrão, ele não poderá ser descarregado da memória enquanto o processo estiver em execução. No entanto, se você abrir um segundo domínio de aplicativo para carregar e executar o assembly, o assembly será descarregado quando o domínio do aplicativo for descarregado. Use essa técnica para minimizar o conjunto de trabalho de processos de execução longa que ocasionalmente usam DLLs grandes.

Vários domínios de aplicativo podem ser executados em um único processo; no entanto, não há uma correlação um-para-um entre domínios de aplicativo e threads. Vários threads podem pertencer a um único domínio de aplicativo e, embora um determinado thread não esteja confinado a um único domínio de aplicativo, em um determinado momento, um thread é executado em um único domínio de aplicativo.

Domínios de aplicativo são criados usando o CreateDomain método. AppDomain as instâncias são usadas para carregar e executar assemblies (Assembly). Quando um AppDomain não está mais em uso, ele pode ser descarregado.

A AppDomain classe implementa um conjunto de eventos que permitem que os aplicativos respondam quando um assembly é carregado, quando um domínio de aplicativo será descarregado ou quando uma exceção sem tratamento é gerada.

Para obter mais informações sobre como usar domínios de aplicativo, consulte Domínios de Aplicativo.

Essa classe implementa as interfaces e IEvidenceFactory as MarshalByRefObject_AppDomaininterfaces.

Você nunca deve criar um wrapper remoto para um AppDomain objeto. Isso poderia publicar uma referência remota a isso AppDomain, expondo métodos como CreateInstance o acesso remoto e destruindo efetivamente a segurança de acesso ao código para isso AppDomain. Clientes mal-intencionados que se conectam ao remoted AppDomain podem obter acesso a qualquer recurso ao qual o AppDomain próprio tem acesso. Não crie wrappers remotos para qualquer tipo que se estenda MarshalByRefObject e que implemente métodos que possam ser usados por clientes mal-intencionados para ignorar o sistema de segurança.

Confira também

• Como configurar um domínio de aplicativo
• Como criar um domínio de aplicativo
• Como carregar assemblies em um domínio de aplicativo
• Como descarregar um domínio de aplicativo