AppDomainUnloadedException AppDomainUnloadedException AppDomainUnloadedException AppDomainUnloadedException Class

定义

当尝试访问已卸载的应用程序域时引发的异常。The exception that is thrown when an attempt is made to access an unloaded application domain.

public ref class AppDomainUnloadedException : SystemException
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public class AppDomainUnloadedException : SystemException
type AppDomainUnloadedException = class
    inherit SystemException
Public Class AppDomainUnloadedException
Inherits SystemException
继承
AppDomainUnloadedExceptionAppDomainUnloadedExceptionAppDomainUnloadedExceptionAppDomainUnloadedException
属性

示例

本部分包含两个代码示例。This section contains two code examples. 第一个示例演示的效果AppDomainUnloadedException上各种线程和第二个的显示基本的应用程序域卸载。The first example demonstrates the effects of an AppDomainUnloadedException on various threads, and the second shows elementary application domain unloading.

示例 1Example 1

下面的代码示例定义TestClass可以跨应用程序域边界封送的类和一个Example类包含static(Shared在 Visual Basic 中)ThreadProc方法。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. ThreadProc方法创建应用程序域中,创建TestClass域中的对象和调用的方法TestClass卸载正在执行的域中,从而导致AppDomainUnloadedExceptionThe 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.

TestClass方法执行不带异常处理从ThreadPool线程和从一个普通的线程,演示未经处理的异常终止该任务或线程,但不是应用程序。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. 然后执行,无需处理从主应用程序线程,演示它终止应用程序,如果未处理的异常。It is then executed with and without exception handling from the main application thread, demonstrating that it terminates the application if not handled.

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()
 */
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()
' 

示例 2Example 2

下面的代码示例创建和卸载应用程序域,并演示的AppDomainUnloadedException随后尝试访问已卸载的域上引发。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." );
   }

}

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.");
		}
		
	}
	
}
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 'Main 
End Class 'ADUnload

注解

在.NET Framework 2.0 版中, AppDomainUnloadedException ,它是在未处理的用户代码有以下影响:In the .NET Framework version 2.0, an AppDomainUnloadedException that is not handled in user code has the following effect:

  • 如果线程已启动托管代码中,将它终止。If a thread was started in managed code, it is terminated. 不允许未经处理的异常终止该应用程序。The unhandled exception is not allowed to terminate the application.

  • 如果任务在其上执行ThreadPool线程,则将它终止和线程返回到线程池。If a task is executing on a ThreadPool thread, it is terminated and the thread is returned to the thread pool. 不允许未经处理的异常终止该应用程序。The unhandled exception is not allowed to terminate the application.

  • 如果在非托管代码中,例如,在主应用程序线程启动一个线程将它终止。If a thread started in unmanaged code, such as the main application thread, it is terminated. 未经处理的异常允许继续进行,并且操作系统终止应用程序。The unhandled exception is allowed to proceed, and the operating system terminates the application.

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

有关实例的初始属性值的列表AppDomainUnloadedException,请参阅AppDomainUnloadedException构造函数。For a list of initial property values for an instance of AppDomainUnloadedException, see the AppDomainUnloadedException constructors.

构造函数

AppDomainUnloadedException() AppDomainUnloadedException() AppDomainUnloadedException() AppDomainUnloadedException()

初始化 AppDomainUnloadedException 类的新实例。Initializes a new instance of the AppDomainUnloadedException class.

AppDomainUnloadedException(SerializationInfo, StreamingContext) AppDomainUnloadedException(SerializationInfo, StreamingContext) AppDomainUnloadedException(SerializationInfo, StreamingContext) AppDomainUnloadedException(SerializationInfo, StreamingContext)

用序列化数据初始化 AppDomainUnloadedException 类的新实例。Initializes a new instance of the AppDomainUnloadedException class with serialized data.

AppDomainUnloadedException(String) AppDomainUnloadedException(String) AppDomainUnloadedException(String) AppDomainUnloadedException(String)

用指定的错误消息初始化 AppDomainUnloadedException 类的新实例。Initializes a new instance of the AppDomainUnloadedException class with a specified error message.

AppDomainUnloadedException(String, Exception) AppDomainUnloadedException(String, Exception) AppDomainUnloadedException(String, Exception) AppDomainUnloadedException(String, Exception)

使用指定的错误消息和对作为此异常原因的内部异常的引用来初始化 AppDomainUnloadedException 类的新实例。Initializes a new instance of the AppDomainUnloadedException class with a specified error message and a reference to the inner exception that is the cause of this exception.

属性

Data Data Data Data

获取提供有关异常的其他用户定义信息的键/值对集合。Gets a collection of key/value pairs that provide additional user-defined information about the exception.

(Inherited from Exception)
HelpLink HelpLink HelpLink HelpLink

获取或设置指向与此异常关联的帮助文件链接。Gets or sets a link to the help file associated with this exception.

(Inherited from Exception)
HResult HResult HResult HResult

获取或设置 HRESULT(一个分配给特定异常的编码数字值)。Gets or sets HRESULT, a coded numerical value that is assigned to a specific exception.

(Inherited from Exception)
InnerException InnerException InnerException InnerException

获取导致当前异常的 Exception 实例。Gets the Exception instance that caused the current exception.

(Inherited from Exception)
Message Message Message Message

获取描述当前异常的消息。Gets a message that describes the current exception.

(Inherited from Exception)
Source Source Source Source

获取或设置导致错误的应用程序或对象的名称。Gets or sets the name of the application or the object that causes the error.

(Inherited from Exception)
StackTrace StackTrace StackTrace StackTrace

获取调用堆栈上的即时框架字符串表示形式。Gets a string representation of the immediate frames on the call stack.

(Inherited from Exception)
TargetSite TargetSite TargetSite TargetSite

获取引发当前异常的方法。Gets the method that throws the current exception.

(Inherited from Exception)

方法

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

确定指定的对象是否等于当前对象。Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetBaseException() GetBaseException() GetBaseException() GetBaseException()

当在派生类中重写时,返回 Exception,它是一个或多个并发的异常的根源。When overridden in a derived class, returns the Exception that is the root cause of one or more subsequent exceptions.

(Inherited from Exception)
GetHashCode() GetHashCode() GetHashCode() GetHashCode()

作为默认哈希函数。Serves as the default hash function.

(Inherited from Object)
GetObjectData(SerializationInfo, StreamingContext) GetObjectData(SerializationInfo, StreamingContext) GetObjectData(SerializationInfo, StreamingContext) GetObjectData(SerializationInfo, StreamingContext)

当在派生类中重写时,用关于异常的信息设置 SerializationInfoWhen overridden in a derived class, sets the SerializationInfo with information about the exception.

(Inherited from Exception)
GetType() GetType() GetType() GetType()

获取当前实例的运行时类型。Gets the runtime type of the current instance.

(Inherited from Exception)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

创建当前 Object 的浅表副本。Creates a shallow copy of the current Object.

(Inherited from Object)
ToString() ToString() ToString() ToString()

创建并返回当前异常的字符串表示形式。Creates and returns a string representation of the current exception.

(Inherited from Exception)

事件

SerializeObjectState SerializeObjectState SerializeObjectState SerializeObjectState

当异常被序列化用来创建包含有关该异常的徐列出数据的异常状态对象时会出现该问题。Occurs when an exception is serialized to create an exception state object that contains serialized data about the exception.

(Inherited from Exception)

适用于

另请参阅