Question

我想使用AppDomain加载和卸载程序集，但它不起作用。这是我提出的最简单的例子。

using System;
using System.Reflection;

namespace DomainTest
{
    class Program
    {
        static void Main(string[] args)
        {
            AppDomain _newDomain;
            var setup = new AppDomainSetup();
            setup.ApplicationBase = AppDomain.CurrentDomain.BaseDirectory;
            setup.ApplicationName = "Isolator";

            _newDomain = AppDomain.CreateDomain("Isolation:" + Guid.NewGuid(),
               null, setup);

            Console.WriteLine("-----------------Before Domain created");
            ShowLoadedAssemblies();

            _newDomain.Load("WorkerTest");
            Console.WriteLine("---------------------After Load");
            ShowLoadedAssemblies();

            AppDomain.Unload(_newDomain);
            Console.WriteLine("--------------------After Unload");
            ShowLoadedAssemblies();

            Console.ReadLine();

        }

        public static void ShowLoadedAssemblies()
        {
            AppDomain currentDomain = AppDomain.CurrentDomain;
            //Make an array for the list of assemblies.
            Assembly[] assems = currentDomain.GetAssemblies();

            //List the assemblies in the current application domain.
            Console.WriteLine("Currently loaded Assemblies:");
            foreach (Assembly assem in assems)
                Console.WriteLine(assem.ToString());
        }
    }
}

为了简化示例，WorkerTest程序集是一个空程序集除了标准的Microsoft.CSharp和System.Dll

之外没有任何引用

namespace WorkerTest
{
    public class Worker
    {

    }
}

此示例有一个带有Main（）方法的Program类，我在其中创建一个新的AppDomain（_newDomain）并将WorkerTest.DLL程序集加载到其中。之后，我卸载_newDomain并期望使用它卸载WorkerTest.DLL，但它不会发生。下面您可以看到程序输出，它显示在加载之前，在将WorkerTest加载到_newDomain之后和卸载_newDomain之后加载的所有程序集。 WorkerTest.DLL仍然被加载。有人能告诉我为什么它不起作用吗？

 -----------------Before Domain created
Currently loaded Assemblies:
mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
Microsoft.VisualStudio.HostingProcess.Utilities, Version=14.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
Microsoft.VisualStudio.HostingProcess.Utilities.Sync, Version=14.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
Microsoft.VisualStudio.Debugger.Runtime, Version=14.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
vshost32, Version=14.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
Microsoft.CSharp, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
DomainTest, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
---------------------After Load
Currently loaded Assemblies:
mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
Microsoft.VisualStudio.HostingProcess.Utilities, Version=14.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
Microsoft.VisualStudio.HostingProcess.Utilities.Sync, Version=14.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
Microsoft.VisualStudio.Debugger.Runtime, Version=14.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
vshost32, Version=14.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
Microsoft.CSharp, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
DomainTest, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
WorkerTest, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
--------------------After Unload
Currently loaded Assemblies:
mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
Microsoft.VisualStudio.HostingProcess.Utilities, Version=14.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
Microsoft.VisualStudio.HostingProcess.Utilities.Sync, Version=14.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
Microsoft.VisualStudio.Debugger.Runtime, Version=14.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
vshost32, Version=14.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
Microsoft.CSharp, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
DomainTest, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
WorkerTest, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null

Answer 1

我认为问题在于_newDomain.Load("WorkerTest");将Assembly对象返回到当前应用域。由于Assembly包含对所有元信息的访问权限，因此它必须实际将程序集加载到当前域。

要将程序集正确加载到新域中，应该仅通过该新域中的代码来完成。或者，如果您只需要创建对象的实例 - Loading DLLs into a separate AppDomain

我想在一个单独的应用程序域中动态卸载程序集，但它不起作用

1 个答案: