CannotUnloadAppDomainException Class
.NET Framework 4
The exception that is thrown when an attempt to unload an application domain fails.
Namespace:
System
Assembly: mscorlib (in mscorlib.dll)
The CannotUnloadAppDomainException type exposes the following members.
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CannotUnloadAppDomainException() | Initializes a new instance of the CannotUnloadAppDomainException class. |
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CannotUnloadAppDomainException(String) | Initializes a new instance of the CannotUnloadAppDomainException class with a specified error message. |
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CannotUnloadAppDomainException(SerializationInfo, StreamingContext) | Initializes a new instance of the CannotUnloadAppDomainException class from serialized data. |
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CannotUnloadAppDomainException(String, Exception) | Initializes a new instance of the CannotUnloadAppDomainException class with a specified error message and a reference to the inner exception that is the cause of this exception. |
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Data | Gets a collection of key/value pairs that provide additional user-defined information about the exception. (Inherited from Exception.) |
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HelpLink | Gets or sets a link to the help file associated with this exception. (Inherited from Exception.) |
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HResult | Gets or sets HRESULT, a coded numerical value that is assigned to a specific exception. (Inherited from Exception.) |
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InnerException | Gets the Exception instance that caused the current exception. (Inherited from Exception.) |
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Message | Gets a message that describes the current exception. (Inherited from Exception.) |
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Source | Gets or sets the name of the application or the object that causes the error. (Inherited from Exception.) |
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StackTrace | Gets a string representation of the immediate frames on the call stack. (Inherited from Exception.) |
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TargetSite | Gets the method that throws the current exception. (Inherited from Exception.) |
| Name | Description | |
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Equals(Object) | Determines whether the specified Object is equal to the current Object. (Inherited from Object.) |
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Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
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GetBaseException | When overridden in a derived class, returns the Exception that is the root cause of one or more subsequent exceptions. (Inherited from Exception.) |
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GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
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GetObjectData | When overridden in a derived class, sets the SerializationInfo with information about the exception. (Inherited from Exception.) |
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GetType |
Gets the runtime type of the current instance. (Inherited from Exception.) In XNA Framework 3.0, this member is inherited from Object.GetType(). |
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MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
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ToString | Creates and returns a string representation of the current exception. (Inherited from Exception.) |
| Name | Description | |
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SerializeObjectState | Occurs when an exception is serialized to create an exception state object that contains serialized data about the exception. (Inherited from Exception.) |
CannotUnloadAppDomainException is thrown when there is an attempt to unload the following:
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The default application domain, which must remain loaded during the lifetime of the application.
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An application domain with a running thread that cannot immediately stop execution.
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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.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
Native Thread
This exception will not be thrown when thread is executing managed code. But it will get called when it's blocked in unmanaged API.
Easiest console app which will display this exception type:
class Program
{
static void Main(string[] args)
{
AppDomain kengaDomain = AppDomain.CreateDomain("Kenga Domain");
Kenga kenga = (Kenga)kengaDomain.CreateInstanceAndUnwrap(Assembly.GetExecutingAssembly().FullName, typeof(Kenga).FullName);
Thread t = new Thread(() =>
{
kenga.BeStuck();
});
t.Start();
// Wait until BeStuck is actually being called
Thread.Sleep(2000);
// This will throw CannotUnloadAppDomainException
AppDomain.Unload(kengaDomain);
}
}
public class Kenga : MarshalByRefObject
{
public void BeStuck()
{
MessageBox.Show("Stuck");
}
}
Output will be:
Unhandled Exception: System.CannotUnloadAppDomainException: Error while unloading appdomain. (Exception from HRESULT: 0x80131015)
at System.AppDomain.Unload(AppDomain domain)
at ...
- 5/14/2012
- soyuz
Also happens when unloading an app domain from the finalizer thread...
You'll also get this exception if you attempt to call AppDomain.Unload from the finalizer thread. You can work around it by having your finalizer queue the unload onto a worker thread. If the worker thread fails to unload it you can create a new instance of the finalizable object and have it try again.
- 11/14/2011
- Dino Viehland
