第一个 SO 帖子，所以如果我的问题没有充分组合，请告诉我！
用例：用户打开浏览器，然后按下“在设备上付款”按钮。我调度了一个 PayOnDevice 操作，它将 UI 更新为加载状态。我有一个 HandlePayOnDevice [Effect] 方法，该方法会执行该操作并异步启动设备以进行付款。当用户将卡插入设备时，支付成功/失败，异步方法解析并将 UI 更新为成功/失败。但是，如果浏览器在异步方法解析之前关闭，我想让设备完成并告诉另一个服务设备支付成功或失败。
问题：我可以通过覆盖 FluxorComponent 的虚拟 Dispose(bool disposing) 方法来调度操作“BrowserClosed”，从而在技术上做到这一点。然后，当原始设备异步方法解析时，我可以检查 IState 以查看浏览器是否关闭，以了解是否更新 UI 或使用结果更新其他系统。这是覆盖 Dispose 方法：
protected override void Dispose(bool disposing)
{
Dispatcher.Dispatch(new BrowserClosedAction());
base.Dispose(disposing);
}
在此 dispose 方法中调用 Dispatch 的问题是渲染逻辑中断，因为组件已被释放，因此引发错误（但 IState 仍在更新，因此我的 Effect 方法仍然可以辨别是更新 UI 还是不同的服务） ：
Unhandled exception in circuit '2y97VfGYbGWD9xJIhtsbLOfj9PsQChpDlqBrGQdVXTQ'.
System.ObjectDisposedException: Cannot process pending renders after the renderer has been disposed.
Object name: 'Renderer'.
at Microsoft.AspNetCore.Components.RenderTree.Renderer.ProcessPendingRender()
at Microsoft.AspNetCore.Components.Server.Circuits.RemoteRenderer.ProcessPendingRender()
at Microsoft.AspNetCore.Components.RenderTree.Renderer.AddToRenderQueue(Int32 componentId, RenderFragment renderFragment)
at Microsoft.AspNetCore.Components.ComponentBase.StateHasChanged()
at Microsoft.AspNetCore.Components.Rendering.RendererSynchronizationContextDispatcher.InvokeAsync(Action workItem)
at Microsoft.AspNetCore.Components.ComponentBase.InvokeAsync(Action workItem)
at Fluxor.Blazor.Web.Components.FluxorComponent.<OnInitialized>b__8_0(IState _)
at Fluxor.StateSubscriber.<>c__DisplayClass2_1.<Subscribe>b__1(Object s, EventArgs a)
at Fluxor.Feature`1.TriggerStateChangedCallbacks(TState newState) at Fluxor.Feature`1.set_State(TState value)
at Fluxor.Store.DequeueActions()
at Fluxor.Store.Dispatch(Object action)
at MyComponent.Dispose(Boolean disposing) in C:\MyComponentPath\MyComponent.razor:line XXX
at Fluxor.Blazor.Web.Components.FluxorComponent.Dispose()
at Microsoft.AspNetCore.Components.Rendering.ComponentState.Dispose()
at Microsoft.AspNetCore.Components.RenderTree.Renderer.Dispose(Boolean disposing)
从技术上讲，即使抛出了这个错误，我仍然可以做我需要做的事情，但我认为我不应该因为错误而走这条路（我希望这是可以避免的！）并且想知道是否有另一种方法做到这一点。我认为可能有一种方法可以创建 Scoped CircuitHandler 来调度动作，但我不知道如何将 IState/Dispatcher 注入到该电路处理程序中。此电路处理程序失败：
public class BrowserClosedHandler : CircuitHandler
{
BrowserClosedHandler(IState<S.AppState> appState, IDispatcher dispatcher)
{
AppState = appState;
Dispatcher = dispatcher;
}
private IState<S.AppState> AppState;
private IDispatcher Dispatcher;
public override Task OnConnectionDownAsync(Circuit circuit,
CancellationToken cancellationToken)
{
Dispatcher.Dispatch(new BrowserClosedAction());
return Task.CompletedTask;
}
}
...
// SERVICES SETUP
services.AddScoped<CircuitHandler, BrowserClosedHandler>();
services.AddFluxor(o => o
.ScanAssemblies(typeof(Program).Assembly)
.UseRouting()
);
这会导致启动时出错：
The application failed to start correctly
System.AggregateException: Some services are not able to be constructed (Error while validating the service descriptor 'ServiceType: Microsoft.AspNetCore.Components.Server.Circuits.CircuitHandler Lifetime: Scoped ImplementationType: ECC.Startup+BrowserClosedHandler': A suitable constructor for type 'ECC.Startup+BrowserClosedHandler' could not be located. Ensure the type is concrete and services are registered for all parameters of a public constructor.)
---> System.InvalidOperationException: Error while validating the service descriptor 'ServiceType: Microsoft.AspNetCore.Components.Server.Circuits.CircuitHandler Lifetime: Scoped ImplementationType: ECC.Startup+BrowserClosedHandler': A suitable constructor for type 'ECC.Startup+BrowserClosedHandler' could not be located. Ensure the type
is concrete and services are registered for all parameters of a public constructor.
---> System.InvalidOperationException: A suitable constructor for type 'ECC.Startup+BrowserClosedHandler' could not be located. Ensure
the type is concrete and services are registered for all parameters
of a public constructor.
at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteFactory.CreateConstructorCallSite(ResultCache lifetime, Type serviceType, Type implementationType, CallSiteChain callSiteChain)
at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteFactory.TryCreateExact(ServiceDescriptor descriptor, Type serviceType, CallSiteChain callSiteChain, Int32 slot)
at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteFactory.GetCallSite(ServiceDescriptor serviceDescriptor, CallSiteChain callSiteChain)
at Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngine.ValidateService(ServiceDescriptor descriptor)
--- End of inner exception stack trace ---
at Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngine.ValidateService(ServiceDescriptor descriptor)
at Microsoft.Extensions.DependencyInjection.ServiceProvider..ctor(IEnumerable`1 serviceDescriptors, ServiceProviderOptions options)
--- End of inner exception stack trace ---
at Microsoft.Extensions.DependencyInjection.ServiceProvider..ctor(IEnumerable`1 serviceDescriptors, ServiceProviderOptions options)
at Microsoft.Extensions.DependencyInjection.ServiceCollectionContainerBuilderExtensions.BuildServiceProvider(IServiceCollection services, ServiceProviderOptions options)
at Microsoft.Extensions.DependencyInjection.DefaultServiceProviderFactory.CreateServiceProvider(IServiceCollection containerBuilder)
at Microsoft.Extensions.Hosting.Internal.ServiceFactoryAdapter`1.CreateServiceProvider(Object containerBuilder)
at Microsoft.Extensions.Hosting.HostBuilder.CreateServiceProvider()
at Microsoft.Extensions.Hosting.HostBuilder.Build()
at ECC.Program.Main(String[] args) in C:\SomePath\Program.cs:line XXX
任何帮助将不胜感激！