CannotUnloadAppDomainException Class

Represents the error that occurs when an attempt to unload an application domain fails.

Syntax

[System.Runtime.InteropServices.ComVisible(true)]
public class CannotUnloadAppDomainException : SystemException

Remarks

CannotUnloadAppDomainException is thrown when there is an attempt to unload:

The default application domain, which must remain 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.

Thread Safety

All public static members of this type are safe for multithreaded operations. No instance members are guaranteed to be thread safe.

Example

The following example demonstrates an error that causes the CannotUnloadAppDomainException exception to be thrown.

C# Example

using System;
using System.Threading;

public class CannotUnloadAppDomainExceptionTest {
  public static void Main() {
    AppDomain ad = Thread.GetDomain();
    AppDomain.Unload(ad);
  }
}

The output is

Example

Unhandled Exception: System.CannotUnloadAppDomainException: The default domain cannot be unloaded.
   at System.AppDomain.Unload(AppDomain domain)
   at CannotUnloadAppDomainExceptionTest.Main()

Requirements

Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0, 4.0.0.0