ASP.NET 核心的 IAuthorizationFilter 和简单注入器的依赖注入失败

Question

这与非常相似，但解决方案不适用于 .net core 3.1。

所以，我有 IAuthorizationFilter:

public class AuthFilter : IAuthorizationFilter
{
    private readonly IUserService userService;
    public AuthFilter(IUserService userService)
    {
        this.userService = userService;
    }

    public void OnAuthorization(AuthorizationFilterContext context)
    {
        Console.WriteLine("Doing authZZZ: " + userService.DoSomething());
    }
}

和简单的服务

public interface IUserService
{
    string DoSomething();
}

class UserService : IUserService
{
    public string DoSomething()
    {
        return "Something";
    }
}

正在将过滤器和服务注册为：

services.Configure<MvcOptions>(options => options.Filters.Add<AuthFilter>());
...
container.Register<IUserService, UserService>(Lifestyle.Transient);

其他一切，如 example

调用操作时出现异常：

InvalidOperationException: Unable to resolve service for type 'TestSimpleInj.IUserService' while attempting to activate 'TestSimpleInj.AuthFilter'.

Microsoft.Extensions.DependencyInjection.ActivatorUtilities.GetService(IServiceProvider sp, Type type, Type requiredBy, bool isDefaultParameterRequired)
lambda_method(Closure , IServiceProvider , object[] )
Microsoft.AspNetCore.Mvc.TypeFilterAttribute.CreateInstance(IServiceProvider serviceProvider)
Microsoft.AspNetCore.Mvc.Filters.DefaultFilterProvider.ProvideFilter(FilterProviderContext context, FilterItem filterItem)
Microsoft.AspNetCore.Mvc.Filters.DefaultFilterProvider.OnProvidersExecuting(FilterProviderContext context)
Microsoft.AspNetCore.Mvc.Filters.FilterFactory.CreateUncachedFiltersCore(IFilterProvider[] filterProviders, ActionContext actionContext, List<FilterItem> filterItems)
Microsoft.AspNetCore.Mvc.Filters.FilterFactory.GetAllFilters(IFilterProvider[] filterProviders, ActionContext actionContext)
Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvokerCache.GetCachedResult(ControllerContext controllerContext)
Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvokerProvider.OnProvidersExecuting(ActionInvokerProviderContext context)
Microsoft.AspNetCore.Mvc.Infrastructure.ActionInvokerFactory.CreateInvoker(ActionContext actionContext)
Microsoft.AspNetCore.Mvc.Routing.ActionEndpointFactory+<>c__DisplayClass7_0.<CreateRequestDelegate>b__0(HttpContext context)
Microsoft.AspNetCore.Routing.EndpointMiddleware.Invoke(HttpContext httpContext)
Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

Answer 1

你的问题的答案实际上几乎在你提到的中给出了，但你只需要一些小的调整就可以让它在 ASP.NET Core MVC 下工作。

您需要将 AuthorizationFilterProxy<TFilter> 更改为以下内容：

public class AuthorizationFilterProxy<TFilter> : IAuthorizationFilter
    where TFilter : class, IAuthorizationFilter
{
    private readonly Container Container;

    public AuthorizationFilterProxy(Container container) =>
        this.Container = container;

    public void OnAuthorization(AuthorizationFilterContext context) =>
        this.Container.GetInstance<TFilter>().OnAuthorization(context);
}

现在你需要将这个 AuthorizationFilterProxy<TFilter> 挂接到 ASP.NET Core MVC 的管道中，可以按如下方式完成：

services.Configure<MvcOptions>(options => options.Filters.Add(
    new AuthorizationFilterProxy<AuthFilter>(container)));

container.Register<AuthFilter>();

这也非常类似于向 ASP.NET MVC 添加全局过滤器，如所引用的问题所示。

这会将 AuthorizationFilterProxy<AuthFilter> 添加到 MVC 过滤器列表中，代理会将调用转发给简单注入器。 AuthFilter 现在已从 Simple Injector 及其 IUserService 依赖项中解决。

ASP.NET 核心的 IAuthorizationFilter 和简单注入器的依赖注入失败

Dependency injection failed with IAuthorizationFilter and Simple Injector for ASP.NET Core

c#

dependency-injection

asp.net-core-mvc

simple-injector