解析使用动态加载的DLL的Castle Windsor的控制器

加载Web应用程序后,Castle Windsor无法找到控制器.找不到路径“”的控制器或未实现IController.当我查看内核时(在CustomControllerFactory中),我看到所有控制器都已正确注册.

MVC主应用程序加载其他3个DLL.当我们在Visual Studio中直接引用DLL并加载插件类型时,它就起作用了.但是,当动态加载它时,它会失败.当我请求URL时,传递到GetControllerInstance中的上下文是正确的,但Type参数为null.

我使用Assembload.LoadFrom加载程序集,然后检索Types foreach模块,该模块是Plugin的子类.结果是我有3种类型.

Assembly assembly = Assembly.LoadFrom(module);

Type pluginType = assembly.GetTypes()
                    .Single(x => x.IsSubclassOf(typeof(Plugin)));

然后,我创建一个插件实例,用于注册路由.

(IPlugin)Activator.CreateInstance(type))

RegisterRoutes：

    public static void RegisterRoutes(RouteCollection routes, IEnumerable<IPlugin> plugins)
    {
        routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

        var pluginRouteDefaults = new {action = "Index", id = UrlParameter.Optional};
        foreach (var plugin in plugins)
        {
            var context = new AreaRegistrationContext(plugin.Area, routes);
            context.MapRoute(plugin.Area, $"{plugin.Area}/{{controller}}/{{action}}/{{id}}", pluginRouteDefaults, plugin.GetControllerNamespaces().ToArray());
        }

        routes.MapRoute(
              name: "Default",
              url: "{area}/{controller}/{action}/{id}",
              defaults: new { area = "Framework", controller = "Home", action = "Index", id = UrlParameter.Optional },
              namespaces: new string[] { "Web.Framework.Controllers" }
              );
    }

CustomControllerFactory：

public class CustomControllerFactory : DefaultControllerFactory
{
    private readonly IKernel _kernel;

    public VlcControllerFactory(IKernel kernel)
    {
        this._kernel = kernel;
    }

    public override void ReleaseController(IController controller)
    {
        _kernel.ReleaseComponent(controller);
    }

    protected override IController GetControllerInstance(RequestContext context, Type controllerType)
    {
        if (controllerType == null)
        {
            return base.GetControllerInstance(context, controllerType);
        }
        try
        {
            return (IController)_kernel.Resolve(controllerType);
        }
        catch
        {
            return base.GetControllerInstance(context, controllerType);
        }
    }
}

注册控制器.完成此操作后,我可以看到在Visual Studio的“模块”窗口中已加载了DLL.另外,AppDomain.CurrentDomain.GetAssemblies()表示已加载DLL.

container.Register(
            Classes.FromThisAssembly().BasedOn<IController>().LifestyleTransient());

我在其中找到Dll的MvcApplication类.

public class MvcApplication : System.Web.HttpApplication
{
    protected void Application_Start()
    {
        var directories = Directory.GetDirectories("C:\Projects\main\modules").Where(x => !x.EndsWith("Framework"));
        string subPath = GetSubPath();

        List<Type> pluginTypes = GetPluginTypes(directories, subPath);
        var plugins = GetIPlugins(pluginTypes);
        Launcher.CreateWindsorContainer(plugins.ToArray());
    }

    private static List<IPlugin> GetIPlugins(List<Type> pluginTypes)
    {
        List<IPlugin> plugins = new List<IPlugin>{new MvcInstaller()};

        pluginTypes.ForEach(type => plugins.Add((IPlugin) Activator.CreateInstance(type)));
        return plugins;
    }

    private static List<Type> GetPluginTypes(IEnumerable<string> directories, string subPath)
    {
        List<Type> pluginTypes = new List<Type>();

        foreach (string directory in directories)
        {
            string module = Directory.GetFiles(directory + subPath).SingleOrDefault(x => x.EndsWith("Plugin.dll"));

            if (!string.IsNullOrEmpty(module))
            {
                Assembly assembly = Assembly.LoadFrom(module);
                Type pluginType = assembly.GetTypes()
                    .Single(x => x.IsSubclassOf(typeof(Plugin)));
                pluginTypes.Add(pluginType);
            }
        }
        return pluginTypes;
    }

    private static string GetSubPath()
    {
        #if DEBUG
        var subPath = @"\bin\Debug\";
        #else
        subPath = @"\bin\Release\";
        #endif

        return subPath;
    }
}

当我省略此代码并直接引用其他Dll时,请执行以下操作：

Launcher.CreateWindsorContainer(new PluginA(), new PluginB(), new MVCPlugin());

然后,它可以完美运行,但是由于加载了Dll,控制器解析失败.为什么在请求控制器时Castle Windsor无法找到类型？

解决方法:

这里的问题不是控制器的Windsor分辨率. DefaultControllerType.GetControllerType()方法可能返回null,因为您没有将程序集添加到BuildManager(使用BuildManager.AddReferencedAssembly(assembly)).请记住,只能在应用程序启动之前调用此函数,因此您需要使用[assembly：PreApplicationStartupMethod(typeof(… SomeType),“ PublicStaticVoidMethodOnSomeType”).

标签：dll,castle-windsor,c,asp-net-mvc
来源： https://codeday.me/bug/20191119/2033244.html