AppDomain.Unload(AppDomain) 方法

定义

命名空间:

System

程序集:

System.Runtime.dll

Source:

AppDomain.cs

注意

Creating and unloading AppDomains is not supported and throws an exception.

卸载指定的应用程序域。

public:
 static void Unload(AppDomain ^ domain);

[System.Obsolete("Creating and unloading AppDomains is not supported and throws an exception.", DiagnosticId="SYSLIB0024", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
public static void Unload (AppDomain domain);

[<System.Obsolete("Creating and unloading AppDomains is not supported and throws an exception.", DiagnosticId="SYSLIB0024", UrlFormat="https://aka.ms/dotnet-warnings/{0}")>]
static member Unload : AppDomain -> unit

Public Shared Sub Unload (domain As AppDomain)

参数

domain

AppDomain

要卸载的应用程序域。

属性

ObsoleteAttribute

例外

ArgumentNullException

domain 为 null。

CannotUnloadAppDomainException

仅限 .NET Core 和 .NET 5 及更高版本：在所有情况下。

-或-

domain 未能卸载。

Exception

在卸载进程期间出错。

示例

下面的代码示例演示如何卸载应用程序域。

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.");
        }
    }
}

open System

//Create evidence for the new appdomain.
let adevidence = AppDomain.CurrentDomain.Evidence

// Create the new application domain.
let domain = AppDomain.CreateDomain("MyDomain", adevidence)

printfn $"Host domain: {AppDomain.CurrentDomain.FriendlyName}"
printfn $"child domain: {domain.FriendlyName}"
// Unload the application domain.
AppDomain.Unload domain

try
    printfn ""
    // Note that the following statement creates an exception because the domain no longer exists.
    printfn $"child domain: {domain.FriendlyName}"

with :? AppDomainUnloadedException ->
    printfn "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
End Class

注解

在 .NET Framework 2.0 及更高版本中，有一个专用于卸载应用程序域的线程。 这可以提高可靠性，尤其是在托管.NET Framework时。 当线程调用 Unload时，目标域标记为要卸载。 专用线程尝试卸载域，并且域中的所有线程都中止。 如果线程未中止（例如，因为它正在执行非托管代码，或者因为它正在执行块 finally ），则在一段时间后， CannotUnloadAppDomainException 会在最初称为 Unload的线程中引发 。 如果无法中止的线程最终结束，则不会卸载目标域。 因此，在 .NET Framework 2.0 及更高版本中，domain无法保证卸载，因为可能无法终止执行线程。

注意

在某些情况下，调用 Unload 会导致即时 CannotUnloadAppDomainException，例如，如果在终结器中调用它。

中的 domain 线程使用 Abort 方法终止，该方法在线程中引发 ThreadAbortException 。 尽管线程应立即终止，但它可以在 子句中 finally 继续执行不可预知的时间。

另请参阅

• .NET Core/5+ 上的不可用技术：应用程序域