AppDomainUnloadedException Kelas

Definisi

Ruang nama:

System

Rakitan:

netstandard.dll, System.Runtime.dll

Sumber:

AppDomainUnloadedException.cs

Pengecualian yang dilemparkan ketika upaya dilakukan untuk mengakses domain aplikasi yang tidak dimuat.

public ref class AppDomainUnloadedException : SystemException

public class AppDomainUnloadedException : SystemException

type AppDomainUnloadedException = class
    inherit SystemException

Public Class AppDomainUnloadedException
Inherits SystemException

Warisan

Object

Exception

SystemException

AppDomainUnloadedException

Contoh

Bagian ini berisi dua contoh kode. Contoh pertama menunjukkan efek pada AppDomainUnloadedException berbagai utas, dan yang kedua menunjukkan pembongkaran domain aplikasi dasar.

Contoh 1

Contoh kode berikut mendefinisikan kelas TestClass yang dapat dirusak di seluruh batas domain aplikasi dan kelas Example yang berisi static (Shared di Visual Basic) ThreadProc metode. Metode ini ThreadProc membuat domain aplikasi, membuat TestClass objek di domain, dan memanggil metode TestClass yang membongkar domain yang dieksekusi, menyebabkan AppDomainUnloadedException.

Metode TestClass ini dijalankan tanpa penanganan pengecualian dari ThreadPool utas dan dari utas biasa, menunjukkan bahwa pengecualian yang tidak tertangani mengakhiri tugas atau utas tetapi bukan aplikasi. Kemudian dijalankan dengan dan tanpa penanganan pengecualian dari utas aplikasi utama, menunjukkan bahwa ia mengakhiri aplikasi jika tidak ditangani.

using System;
using System.Threading;
using System.Runtime.InteropServices;

public class Example
{
    public static void Main()
    {
        // 1. Queue ThreadProc as a task for a ThreadPool thread.
        ThreadPool.QueueUserWorkItem(ThreadProc, " from a ThreadPool thread");
        Thread.Sleep(1000);

        // 2. Execute ThreadProc on an ordinary thread.
        Thread t = new Thread(ThreadProc);
        t.Start(" from an ordinary thread");
        t.Join();

        // 3. Execute ThreadProc on the main thread, with
        //    exception handling.
        try
        {
            ThreadProc(" from the main application thread (handled)");
        }
        catch (AppDomainUnloadedException adue)
        {
            Console.WriteLine("Main thread caught AppDomainUnloadedException: {0}", adue.Message);
        }

        // 4. Execute ThreadProc on the main thread without
        //    exception handling.
        ThreadProc(" from the main application thread (unhandled)");

        Console.WriteLine("Main: This message is never displayed.");
    }

    private static void ThreadProc(object state)
    {
        // Create an application domain, and create an instance
        // of TestClass in the application domain. The first
        // parameter of CreateInstanceAndUnwrap is the name of
        // this executable. If you compile the example code using
        // any name other than "Sample.exe", you must change the
        // parameter appropriately.
        AppDomain ad = AppDomain.CreateDomain("TestDomain");
        TestClass tc = (TestClass)ad.CreateInstanceAndUnwrap("Sample", "TestClass");

        // In the new application domain, execute a method that
        // unloads the AppDomain. The unhandled exception this
        // causes ends the current thread.
        tc.UnloadCurrentDomain(state);

        Console.WriteLine("ThreadProc: This message is never displayed.");
    }
}

// TestClass derives from MarshalByRefObject, so it can be marshaled
// across application domain boundaries.
//
public class TestClass : MarshalByRefObject
{
    public void UnloadCurrentDomain(object state)
    {
        Console.WriteLine("\nUnloading the current AppDomain{0}.", state);

        // Unload the current application domain. This causes
        // an AppDomainUnloadedException to be thrown.
        //
        AppDomain.Unload(AppDomain.CurrentDomain);
    }
}

/* This code example produces output similar to the following:
Unloading the current AppDomain from a ThreadPool thread.

Unloading the current AppDomain from an ordinary thread.

Unloading the current AppDomain from the main application thread (handled).
Main thread caught AppDomainUnloadedException: The application domain in which the thread was running has been unloaded.

Unloading the current AppDomain from the main application thread (unhandled).

Unhandled Exception: System.AppDomainUnloadedException: The application domain in which the thread was running has been unloaded.
   at TestClass.UnloadCurrentDomain(Object state)
   at Example.ThreadProc(Object state)
   at Example.Main()
 */

open System
open System.Threading

// TestClass derives from MarshalByRefObject, so it can be marshaled
// across application domain boundaries.
type TestClass() =
    inherit MarshalByRefObject()
    member _.UnloadCurrentDomain (state: obj) =
        printfn $"\nUnloading the current AppDomain{state}."

        // Unload the current application domain. This causes
        // an AppDomainUnloadedException to be thrown.
        //
        AppDomain.Unload AppDomain.CurrentDomain

let threadProc (state: obj) =
    // Create an application domain, and create an instance
    // of TestClass in the application domain. The first
    // parameter of CreateInstanceAndUnwrap is the name of
    // this executable. If you compile the example code using
    // any name other than "Sample.exe", you must change the
    // parameter appropriately.
    let ad = AppDomain.CreateDomain "TestDomain"
    let tc = ad.CreateInstanceAndUnwrap("Sample", "TestClass") :?> TestClass

    // In the new application domain, execute a method that
    // unloads the AppDomain. The unhandled exception this
    // causes ends the current thread.
    tc.UnloadCurrentDomain state

    printfn "ThreadProc: This message is never displayed."

// 1. Queue ThreadProc as a task for a ThreadPool thread.
ThreadPool.QueueUserWorkItem(threadProc, " from a ThreadPool thread") |> ignore
Thread.Sleep 1000

// 2. Execute ThreadProc on an ordinary thread.
let t = Thread(ParameterizedThreadStart threadProc) 
t.Start " from an ordinary thread"
t.Join()

// 3. Execute ThreadProc on the main thread, with
//    exception handling.
try
    threadProc " from the main application thread (handled)"
with :? AppDomainUnloadedException as adue ->
    printfn $"Main thread caught AppDomainUnloadedException: {adue.Message}"

// 4. Execute ThreadProc on the main thread without
//    exception handling.
threadProc " from the main application thread (unhandled)"

printfn "Main: This message is never displayed."

(* This code example produces output similar to the following:
Unloading the current AppDomain from a ThreadPool thread.

Unloading the current AppDomain from an ordinary thread.

Unloading the current AppDomain from the main application thread (handled).
Main thread caught AppDomainUnloadedException: The application domain in which the thread was running has been unloaded.

Unloading the current AppDomain from the main application thread (unhandled).

Unhandled Exception: System.AppDomainUnloadedException: The application domain in which the thread was running has been unloaded.
   at TestClass.UnloadCurrentDomain(Object state)
   at Example.ThreadProc(Object state)
   at Example.main()
 *)

Imports System.Threading
Imports System.Runtime.InteropServices

Public Class Example
    
    Public Shared Sub Main() 

        ' 1. Queue ThreadProc as a task for a ThreadPool thread.
        ThreadPool.QueueUserWorkItem(AddressOf ThreadProc, _
            " from a ThreadPool thread")
        Thread.Sleep(1000)
        
        ' 2. Execute ThreadProc on an ordinary thread.
        Dim t As New Thread(AddressOf ThreadProc)
        t.Start(" from an ordinary thread")
        t.Join()
        
        ' 3. Execute ThreadProc on the main thread, with 
        '    exception handling.
        Try
            ThreadProc(" from the main application thread (handled)")
        Catch adue As AppDomainUnloadedException
            Console.WriteLine("Main thread caught AppDomainUnloadedException: {0}", _
                adue.Message)
        End Try
        
        ' 4. Execute ThreadProc on the main thread without
        '    exception handling.
        ThreadProc(" from the main application thread (unhandled)")
        
        Console.WriteLine("Main: This message is never displayed.")
    
    End Sub 
    
    Private Shared Sub ThreadProc(ByVal state As Object) 
        ' Create an application domain, and create an instance
        ' of TestClass in the application domain. The first
        ' parameter of CreateInstanceAndUnwrap is the name of
        ' this executable. If you compile the example code using
        ' any name other than "Sample.exe", you must change the
        ' parameter appropriately.
        Dim ad As AppDomain = AppDomain.CreateDomain("TestDomain")
        Dim o As Object = ad.CreateInstanceAndUnwrap("Sample", "TestClass")
        Dim tc As TestClass = CType(o, TestClass)
        
        ' In the new application domain, execute a method that
        ' unloads the AppDomain. The unhandled exception this
        ' causes ends the current thread.
        tc.UnloadCurrentDomain(state)
        
        Console.WriteLine("ThreadProc: This message is never displayed.")
    
    End Sub
End Class 

' TestClass derives from MarshalByRefObject, so it can be marshaled
' across application domain boundaries. 
'
Public Class TestClass
    Inherits MarshalByRefObject
    
    Public Sub UnloadCurrentDomain(ByVal state As Object) 
        Console.WriteLine(vbLf & "Unloading the current AppDomain{0}.", state)
        
        ' Unload the current application domain. This causes
        ' an AppDomainUnloadedException to be thrown.
        '
        AppDomain.Unload(AppDomain.CurrentDomain)
    
    End Sub 
End Class 

' This code example produces output similar to the following:
'
'Unloading the current AppDomain from a ThreadPool thread.
'
'Unloading the current AppDomain from an ordinary thread.
'
'Unloading the current AppDomain from the main application thread (handled).
'Main thread caught AppDomainUnloadedException: The application domain in which the thread was running has been unloaded.
'
'Unloading the current AppDomain from the main application thread (unhandled).
'
'Unhandled Exception: System.AppDomainUnloadedException: The application domain in which the thread was running has been unloaded.
'   at TestClass.UnloadCurrentDomain(Object state)
'   at Example.ThreadProc(Object state)
'   at Example.Main()
'

Contoh 2

Contoh kode berikut membuat dan membongkar domain aplikasi, dan menunjukkan bahwa AppDomainUnloadedException dilemparkan pada upaya berikutnya untuk mengakses domain yang dibongkar.

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

//for evidence Object*
int main()
{
   
   //Create evidence for the new appdomain.
   Evidence^ adevidence = AppDomain::CurrentDomain->Evidence;
   
   // Create the new application domain.
   AppDomain^ domain = AppDomain::CreateDomain( "MyDomain", adevidence );
   Console::WriteLine( "Host domain: {0}", AppDomain::CurrentDomain->FriendlyName );
   Console::WriteLine( "child domain: {0}", domain->FriendlyName );
   
   // Unload the application domain.
   AppDomain::Unload( domain );
   try
   {
      Console::WriteLine();
      
      // Note that the following statement creates an exception because the domain no longer exists.
      Console::WriteLine( "child domain: {0}", domain->FriendlyName );
   }
   catch ( AppDomainUnloadedException^ /*e*/ ) 
   {
      Console::WriteLine( "The appdomain MyDomain does not exist." );
   }

}

using System;
using System.Reflection;
using System.Security.Policy;
class ADUnload
{
    public static void Main()
    {

        //Create evidence for the new appdomain.
        Evidence adevidence = AppDomain.CurrentDomain.Evidence;

        // Create the new application domain.
        AppDomain domain = AppDomain.CreateDomain("MyDomain", adevidence);

                Console.WriteLine("Host domain: " + AppDomain.CurrentDomain.FriendlyName);
                Console.WriteLine("child domain: " + domain.FriendlyName);
        // Unload the application domain.
        AppDomain.Unload(domain);

        try
        {
        Console.WriteLine();
        // Note that the following statement creates an exception because the domain no longer exists.
                Console.WriteLine("child domain: " + domain.FriendlyName);
        }

        catch (AppDomainUnloadedException e)
        {
        Console.WriteLine("The appdomain MyDomain does not exist.");
        }
    }
}

open System

//Create evidence for the new appdomain.
let adevidence = AppDomain.CurrentDomain.Evidence

// Create the new application domain.
let domain = AppDomain.CreateDomain("MyDomain", adevidence)

printfn $"Host domain: {AppDomain.CurrentDomain.FriendlyName}"
printfn $"child domain: {domain.FriendlyName}"
// Unload the application domain.
AppDomain.Unload domain

try
    printfn ""
    // Note that the following statement creates an exception because the domain no longer exists.
    printfn $"child domain: {domain.FriendlyName}"

with :? AppDomainUnloadedException ->
    printfn "The appdomain MyDomain does not exist."

Imports System.Reflection
Imports System.Security.Policy

Class ADUnload
   
   Public Shared Sub Main()

      'Create evidence for the new appdomain.
      Dim adevidence As Evidence = AppDomain.CurrentDomain.Evidence

      ' Create the new application domain.
      Dim domain As AppDomain = AppDomain.CreateDomain("MyDomain", adevidence)
      
      Console.WriteLine(("Host domain: " + AppDomain.CurrentDomain.FriendlyName))
      Console.WriteLine(("child domain: " + domain.FriendlyName))
      ' Unload the application domain.
      AppDomain.Unload(domain)
      
      Try
         Console.WriteLine()
         ' Note that the following statement creates an exception because the domain no longer exists.
         Console.WriteLine(("child domain: " + domain.FriendlyName))
      
      Catch e As AppDomainUnloadedException
         Console.WriteLine("The appdomain MyDomain does not exist.")
      End Try
   End Sub
End Class

Keterangan

Dalam .NET Framework versi 2.0, AppDomainUnloadedException yang tidak ditangani dalam kode pengguna memiliki efek berikut:

• Jika utas dimulai dalam kode terkelola, utas akan dihentikan. Pengecualian yang tidak tertangani tidak diizinkan untuk mengakhiri aplikasi.

• Jika tugas dijalankan pada ThreadPool utas, tugas dihentikan dan utas dikembalikan ke kumpulan utas. Pengecualian yang tidak tertangani tidak diizinkan untuk mengakhiri aplikasi.

• Jika utas dimulai dalam kode yang tidak dikelola, seperti utas aplikasi utama, utas tersebut akan dihentikan. Pengecualian yang tidak tertangani diizinkan untuk melanjutkan, dan sistem operasi mengakhiri aplikasi.

AppDomainUnloadedException menggunakan COR_E_APPDOMAINUNLOADED HRESULT, yang memiliki nilai 0x80131014.

Untuk daftar nilai properti awal untuk instance AppDomainUnloadedException, silakan lihat konstruktor AppDomainUnloadedException.

Konstruktor

Nama	Deskripsi
AppDomainUnloadedException()	Menginisialisasi instans baru dari kelas AppDomainUnloadedException.
AppDomainUnloadedException(SerializationInfo, StreamingContext)	Kedaluwarsa. Menginisialisasi instans AppDomainUnloadedException baru kelas dengan data berseri.
AppDomainUnloadedException(String, Exception)	Menginisialisasi instans AppDomainUnloadedException baru kelas dengan pesan kesalahan tertentu dan referensi ke pengecualian dalam yang merupakan penyebab pengecualian ini.
AppDomainUnloadedException(String)	Menginisialisasi instans baru kelas AppDomainUnloadedException dengan pesan kesalahan tertentu.

Properti

Nama	Deskripsi
Data	Mendapatkan kumpulan pasangan kunci/nilai yang memberikan informasi tambahan yang ditentukan pengguna tentang pengecualian. (Diperoleh dari Exception)
HelpLink	Mendapatkan atau mengatur tautan ke file bantuan yang terkait dengan pengecualian ini. (Diperoleh dari Exception)
HResult	Mendapatkan atau mengatur HRESULT, nilai numerik berkode yang ditetapkan ke pengecualian tertentu. (Diperoleh dari Exception)
InnerException	Mendapatkan instans Exception yang menyebabkan pengecualian saat ini. (Diperoleh dari Exception)
Message	Mendapatkan pesan yang menjelaskan pengecualian saat ini. (Diperoleh dari Exception)
Source	Mendapatkan atau mengatur nama aplikasi atau objek yang menyebabkan kesalahan. (Diperoleh dari Exception)
StackTrace	Mendapatkan representasi string dari bingkai langsung pada tumpukan panggilan. (Diperoleh dari Exception)
TargetSite	Mendapatkan metode yang melemparkan pengecualian saat ini. (Diperoleh dari Exception)

Metode

Nama	Deskripsi
Equals(Object)	Menentukan apakah objek yang ditentukan sama dengan objek saat ini. (Diperoleh dari Object)
GetBaseException()	Ketika ditimpa di kelas turunan, mengembalikan Exception yang merupakan akar penyebab dari satu atau beberapa pengecualian berikutnya. (Diperoleh dari Exception)
GetHashCode()	Berfungsi sebagai fungsi hash default. (Diperoleh dari Object)
GetObjectData(SerializationInfo, StreamingContext)	Kedaluwarsa. Saat ditimpa di kelas turunan, mengatur SerializationInfo dengan informasi tentang pengecualian. (Diperoleh dari Exception)
GetType()	Mendapatkan jenis runtime instans saat ini. (Diperoleh dari Exception)
MemberwiseClone()	Membuat salinan dangkal dari Objectsaat ini. (Diperoleh dari Object)
ToString()	Membuat dan mengembalikan representasi string dari pengecualian saat ini. (Diperoleh dari Exception)

Acara

Nama	Deskripsi
SerializeObjectState	Kedaluwarsa. Terjadi ketika pengecualian diserialisasikan untuk membuat objek status pengecualian yang berisi data berseri tentang pengecualian. (Diperoleh dari Exception)

Lihat juga

• AppDomain
• Exception
• Menangani dan menampilkan pengecualian di .NET