CannotUnloadAppDomainException Class
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CannotUnloadAppDomainException Class

The exception that is thrown when an attempt to unload an application domain fails.

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

public ref class CannotUnloadAppDomainException : public SystemException
/** @attribute SerializableAttribute() */ 
/** @attribute ComVisibleAttribute(true) */ 
public class CannotUnloadAppDomainException extends SystemException
public class CannotUnloadAppDomainException extends SystemException

CannotUnloadAppDomainException is thrown when there is an attempt to unload:

  • The default application domain, which must remains loaded during the lifetime of the application.

  • An application domain with a running thread that cannot immediately stop execution.

  • An application domain that has already been unloaded.

CannotUnloadAppDomainException uses the HRESULT COR_E_CANNOTUNLOADAPPDOMAIN, which has the value 0x80131015.

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

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

ref class Worker : MarshalByRefObject
   void TestLoad()
      // You must supply a valid fully qualified assembly name here.
      Assembly::Load("Text assembly name, Culture, PublicKeyToken, Version");
      for each (Assembly^ assem in AppDomain::CurrentDomain->GetAssemblies())

//for evidence Object*
// The following attribute indicates to loader that multiple application
// domains are used in this application.

int main()
   // Create application domain setup information for new application domain.
   AppDomainSetup^ domaininfo = gcnew AppDomainSetup;
   domaininfo->ApplicationBase = System::Environment::CurrentDirectory;
   domaininfo->ApplicationName = "MyMultiDomain Application";
   //Create evidence for the new appdomain from evidence of current application domain.
   Evidence^ adevidence = AppDomain::CurrentDomain->Evidence;
   // Create appdomain.
   AppDomain^ newDomain = AppDomain::CreateDomain( "MyMultiDomain", adevidence, domaininfo );
   // Load an assembly into the new application domain.
   Worker^ w = (Worker^) newDomain->CreateInstanceAndUnwrap(

   //Unload the application domain, which also unloads the assembly.


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 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 .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0

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