AppDomainUnloadedException Class

The exception that is thrown when an attempt is made to access an unloaded application domain.

Namespace: System
Assembly: mscorlib (in mscorlib.dll)

[SerializableAttribute] 
[ComVisibleAttribute(true)] 
public ref class AppDomainUnloadedException : public SystemException
/** @attribute SerializableAttribute() */ 
/** @attribute ComVisibleAttribute(true) */ 
public class AppDomainUnloadedException extends SystemException
SerializableAttribute 
ComVisibleAttribute(true) 
public class AppDomainUnloadedException extends SystemException
Not applicable.

In the .NET Framework version 2.0, an AppDomainUnloadedException that is not handled in user code has the following effect:

  • If a thread was started in managed code, it is terminated. The unhandled exception is not allowed to terminate the application.

  • If a task is executing on a ThreadPool thread, it is terminated and the thread is returned to the thread pool. The unhandled exception is not allowed to terminate the application.

  • If a thread started in unmanaged code, such as the main application thread, it is terminated. The unhandled exception is allowed to proceed, and the operating system terminates the application.

AppDomainUnloadedException uses the HRESULT COR_E_APPDOMAINUNLOADED, which has the value 0x80131014.

For a list of initial property values for an instance of AppDomainUnloadedException, see the AppDomainUnloadedException constructors.

This section contains two code examples. The first example demonstrates the effects of an AppDomainUnloadedException on various threads, and the second shows elementary application domain unloading.

Example 1

The following code example defines a TestClass class that can be marshaled across application domain boundaries and an Example class containing a static (Shared in Visual Basic) ThreadProc method. The ThreadProc method creates an application domain, creates a TestClass object in the domain, and calls a method of TestClass that unloads the executing domain, causing an AppDomainUnloadedException.

The TestClass method is executed without exception handling from a ThreadPool thread and from an ordinary thread, demonstrating that the unhandled exception terminates the task or thread but not the application. It is then executed with and without exception handling from the main application thread, demonstrating that it terminates the application if not handled.

No code example is currently available or this language may not be supported.

Example 2

The following code example creates and unloads an application domain, and demonstrates that an AppDomainUnloadedException is thrown on a subsequent attempt to access the unloaded domain.

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." );
   }

}


import System.*;
import System.Reflection.*;
import System.Security.Policy.*; //for evidence object

class ADUnload
{
    public static void main(String[] args)
    {
        // Create evidence for the new appdomain.
        Evidence adEvidence = AppDomain.get_CurrentDomain().get_Evidence();

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

        Console.WriteLine("Host domain: " 
            + AppDomain.get_CurrentDomain().get_FriendlyName());
        Console.WriteLine("child domain: " + domain.get_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.get_FriendlyName());
        }
        catch (AppDomainUnloadedException e) {
            Console.WriteLine("The appdomain MyDomain does not exist.");
        }
    } //main
} //ADUnload

System.Object
   System.Exception
     System.SystemException
      System.AppDomainUnloadedException

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0

XNA Framework

Supported in: 1.0

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