无法从自定义域中解开 COM 实例

Question

我正在尝试在自定义域的 COM 组件中进行调用。 问题是当我尝试打开我的 ObjectHandle 时，会抛出序列化异常。

但是如果我使用当前的 AppDomain 来创建实例，它就可以工作了......

异常信息：

An unhandled exception of type 'System.Runtime.Serialization.SerializationException' occurred in ConsoleApp1.exe
Additional information: Type 'MyAddin.Main' in assembly 'MyAddin, Version=2019.0.1.5, Culture=neutral, PublicKeyToken=null' is not marked as serializable.

还有我的代码：

using System;

namespace ConsoleApp1
{
    class Program
    {

        static void Main(string[] args)
        {
            string addinPath = "C:\\sources\\MyAddin\\bin\\x64\\Debug\\MyAddin.dll";
            string addinFolder = "C:\\sources\\MyAddin\\bin\\x64\\Debug\\";
            string addinConfigPath = "C:\\sources\\MyAddin\\bin\\x64\\Debug\\MyAddin.dll.config";

            System.AppDomainSetup setup = new System.AppDomainSetup();
            setup.ApplicationBase = addinFolder;
            setup.ConfigurationFile = addinConfigPath;
            setup.ApplicationName = "MyAddin.dll";

            string strClsid = "{2616ad89-f4d1-4dc7-9d9d-a5de101b9085}"; // CLSID of my COM addin

            System.AppDomain customDomain = System.AppDomain.CreateDomain(strClsid,  null,  setup);
            // The type of domain is System.Runtime.Remoting.Proxies.__TransparentProxy}

            // The type of custom domain is 
            System.Type addinComType = System.Type.GetTypeFromCLSID(System.Guid.Parse(strClsid));

            System.Runtime.Remoting.ObjectHandle addinInstanceObjectHandle = customDomain.CreateComInstanceFrom(addinPath, addinComType.FullName); 
            System.Object addinInstance = addinInstanceObjectHandle.Unwrap(); //Throw the Serialization exception when create COM instance from customDomain
            // But working if I did System.AppDomain.CurrentDomain.CreateComInstanceFrom

            System.Reflection.MethodBase myMethod = addinInstance.GetType().GetMethod("connectToEwAPI");
            System.Object[] parameters = { null };
            myMethod.Invoke(addinInstance, parameters);

        }
    }
}

所以我做了一些愚蠢的事情？ 你知道我错过了什么吗？

提前感谢您的帮助

---

编辑

我尝试过使用更基本的程序集。 所以我有一个只有这段代码的 C# 程序集

namespace ClassLibrary2
{
    public class Class1
    {
        public Class1()
        {

        }
        public string MyMethod() => "OK";
    }
}

而我的 exe 代码只是

static void Main(string[] args)
{
    string basePath = @"C:\source\MyAddin\ConsoleApp1\ClassLibrary2\bin\Debug";
    string dllName = @"ClassLibrary2";
    string typeName = "ClassLibrary2.Class1";
    string dllFullpath = $"{basePath}\\{dllName}.dll";

    try
    {
        ObjectHandle objectHandle = AppDomain.CurrentDomain.CreateInstanceFrom(dllFullpath, typeName);
        Object addinObject = objectHandle.Unwrap();
        var myAddinMethod = addinObject.GetType().GetMethod("MyMethod");
        string result = myAddinMethod.Invoke(addinObject, null) as string; // Working


        AppDomainSetup setup = new AppDomainSetup()
        {
            ApplicationBase = basePath,
            ApplicationName = dllName,
            ConfigurationFile = dllName + ".dll.config",
            PrivateBinPath = basePath
        };

        AppDomain customDomain = AppDomain.CreateDomain("MyDomain", null, setup);
        ObjectHandle objectHandleFromCustomDomain = customDomain.CreateInstanceFrom(dllFullpath, typeName);
        Object addinObjectFromCustomDomain = objectHandleFromCustomDomain.Unwrap();  // Exception thrown
        var myAddinMethodFromCustomDomain = addinObjectFromCustomDomain.GetType().GetMethod("MyMethod");
        string resultFromCustomDomain = myAddinMethodFromCustomDomain.Invoke(myAddinMethodFromCustomDomain, null) as string;
    }
    catch(Exception e)
    {
        var t = e.Message; // Exception thrown: 'System.Runtime.Serialization.SerializationException' by objectHandleFromCustomDomain.Unwrap()
    }
}

如您所见，它适用于默认域，但不适用于自定义域....

你有什么想法吗？

Answer 1

如果您想跨AppDomain 边界访问对象，您需要做以下两件事之一：

• 创建类Serializable，例如通过添加[Serializable] 属性。在这种情况下，对象的副本被序列化并通过AppDomain 边界。您调用的任何成员都将在副本上，并且不会影响原始对象。

• 使类派生自MarshalByRefObject。在这种情况下，对对象的引用跨 AppDomain 边界进行编组，您调用的任何成员都会影响其原始 AppDomain 中的对象。