“在WPF上找不到IPlatformOperations。这绝不会发生,你的依赖解析器会被破坏”

时间:2018-04-25 11:41:33

标签: c# wpf .net-assembly mahapps.metro reactiveui

我正在编写一个程序,它是其他较小程序的容器。它通过Assembly.Load加载它的模块,找到实现IModule的类型并生成它们的实例。

在WPF MainWindow中,我有一个RoutedViewHost,它将显示所有内容。

在我的AppBoostrapper中,我有以下内容:

     private ReactiveList<IModule> LoadModules(IMutableDependencyResolver resolver)
        {
            var modules = ModuleLoader.Load(ModulesDirectory);
//                        var modules = new IModule[] { new SampleModuleClass(), }; // this works perftectly!

            foreach (var module in modules)
            {
                try
                {
                    module.RegisterDependencies(this, resolver);
                }
                catch (Exception e)
                {
                    Log.Error(e, "Could not register dependecies for module " + module.Name);
                }
            }

            Log.Debug("Modules loaded: " + string.Join(", ", modules.Select(x => x.Name)));
            return new ReactiveList<IModule>(modules);
        }

然后,在我的示例模块中:

  public void RegisterDependencies(IMainScreen screen, IMutableDependencyResolver resolver)
        {
            _screen = screen;
            _resolver = resolver;


            resolver.Register(() => new SampleView(), typeof(IViewFor<SampleViewModel>));
            resolver.Register(() => new GetNameDialogView(),  typeof(IViewFor<GetNameDialogViewModel>));

            Log.Debug("Dependecies registered");
        }

此外,每个模块都有MainViewModel,当选择模块时由RoutedViewHost显示。

不幸的是,这不起作用。我收到以下错误:

  

ReactiveUI.RoutedViewHost错误无法找到IPlatformOperations。   这绝不应该发生,你的依赖解析器被破坏了

ModuleLoader.Load是这样的:

  public static IModule[] Load(string path)
    {
        if (!Directory.Exists(path))
        {
            Directory.CreateDirectory(path);
            Log.Error("No modules directory found - creating");
            return new IModule[0];
        }

        var moduleTypes = GetTypes(path);

        return moduleTypes.Select(MakeInstance).Where(x => x != null).ToArray();
    }

    private static IModule MakeInstance(Type type)
    {
        try
        {
            var module = type.GetConstructor(new Type[] { })?.Invoke(new object[] { }) as IModule;

            if (module != null)
            {
                Log.Info("{0} module succesfully instatiated", module.Name);
                return module;
            }

            Log.Error("Could not instantiate {0}", type.FullName);
            return null;
        }
        catch (Exception exception)
        {
            Log.Error(exception, "Exception during instatiating {0}", type.FullName);
            return null;
        }
    }

    private static List<Type> GetTypes(string path)
    {
        var di = new DirectoryInfo(path);

        var moduleTypes = new List<Type>();

        foreach (var dir in di.GetDirectories())
        {
            FileInfo[] files = dir.GetFiles("*.dll");
            foreach (var file in files)
            {
                Assembly newAssembly = Assembly.LoadFile(file.FullName);
                Type[] types = newAssembly.GetExportedTypes();
                foreach (var type in types)
                {
                    if (type.IsClass && !type.IsAbstract && (type.GetInterface(typeof(IModule).FullName) != null))
                    {
                        moduleTypes.Add(type);
                        Log.Debug("Loaded {0} type", type.Name);
                    }
                }
            }
        }
        return moduleTypes;
    }

如果我只创建实例而不是加载程序集,则没有错误。如果这很重要,SampleModule也会使用ReactiveUI。

我尝试在各个地方添加Locator.CurrentMutable.InitializeReactiveUI(); (MainWindow构造函数,App构造函数,模块静态构造函数),但没有任何帮助。有什么想法吗?

编辑:如果这很重要,MainWindow是来自mahapps.metro的MetroWindow

EDIT2:

我尝试注册PlatformOperations,正如@Wouter建议的那样:

`var iPlatformOperations = Type.GetType(“ReactiveUI.IPlatformOperations,ReactiveUI,Version = 7.4.0.0,Culture = neutral,PublicKeyToken = null”);

resolver.Register(()=&gt; new PlatformOperations(),iPlatformOperations);`

在模块加载之前和之后,但没有任何变化。

1 个答案:

答案 0 :(得分:0)

嗯,事实证明,简单地调用Assembly.Load("ReactiveUI");就会破坏整个事情,所以我只是添加了过滤加载的DLL来加载名称中只有“Module”的DLL。

然后我遇到了新问题:查看位置不适用于动态加载的程序集,因此我使用以下ResolveView实现创建了自己的ViewLocator:

 public IViewFor ResolveView<T>(T viewModel, string contract = null)
            where T : class
        {
            var typeToFind = ViewModelToViewFunc(viewModel.GetType().AssemblyQualifiedName);

            var ret = attemptToResolveView(Reflection.ReallyFindType(typeToFind, false), contract);
            if (ret != null) return ret;

            // IViewFor<FooBarViewModel> (the original behavior in RxUI 3.1)
            var viewType = typeof(IViewFor<>);
            ret = attemptToResolveView(viewType.MakeGenericType(viewModel.GetType()), contract);
            if (ret != null) return ret;


            // check ViewModel's assembly
            var typeAssembly = viewModel.GetType().Assembly;
            var types = typeAssembly.GetExportedTypes()
                .SelectMany(x => x.GetInterfaces()
                .Where(i => i.Name.Contains("IViewFor")))
                .ToArray(); // all IViewFor from assembly

            types = types.Where(x => x.FullName.Contains(viewModel.GetType().Name.Replace("ViewModel", "View"))).ToArray(); // only IViewFor<ViewModel>

            foreach (var type in types) // in case there is more than one registration - contracts
            {
                ret = attemptToResolveView(type, contract);
                if (ret != null) return ret;
            }

            return null;
        }