我有带有StructureMap和Mediatr的ASP.NET Core 3.1。

以前，当我使用默认的DI容器时，我的子处理程序将触发两次。那里的功能非常有限，所以我切换到StructureMap。但是，当我对扫描仪应用不同的设置时，却无法获得预期的行为。它是执行两次的基本处理程序或子处理程序，或两者都执行。唯一可行的情况是，我没有为typeof(INotificationHandler<>)指定任何内容，由于Auto Wiring（可能是？），一切正常，但是我感觉通知处理程序调用之间存在延迟，所以我d想在应用程序启动时正确配置容器。

我的通知和通知处理程序如下。 预期行为：发布子通知时，一次触发两个处理程序

public class ApplicationUserRegisteredNotification : INotification
{
    public ApplicationUser User { get; }

    public ApplicationUserRegisteredNotification(ApplicationUser user)
    {
        User = user;
    }
}

public class SpecificUserRegisteredNotification : ApplicationUserRegisteredNotification
{
    public SpecificUserProfile SpecificUser { get; }

    public SpecificUserRegisteredNotification(SpecificUserProfile specificUser)
        : base(specificUser.User)
    {
        SpecificUser = specificUser;
    }
}

public class SendEmailConfirmationEmail : INotificationHandler<ApplicationUserRegisteredNotification>
{
    // some code
}
public class SendAdminVerifySpecificUserRegistration : INotificationHandler<SpecificUserRegisteredNotification>
{
    // some code
}

我使用StructureMap.AspNetCore来产生IServiceProvider，我可以使用什么选项来明确地应用自动装配逻辑？在下面的注释中，您可以看到每个选项的输出。

public IServiceProvider ConfigureServices(IServiceCollection services)
{
    // some code
    var container = new Container(cfg =>
    {
        cfg.Scan(scanner =>
        {
            scanner.AssemblyContainingType(GetType());
            scanner.ConnectImplementationsToTypesClosing(typeof(IRequestHandler<>));
            scanner.ConnectImplementationsToTypesClosing(typeof(IRequestHandler<,>));
            //scanner.ConnectImplementationsToTypesClosing(typeof(INotificationHandler<>)); // both handlers triggered twice in given sequence: base,child,base,child
            //scanner.AddAllTypesOf(typeof(INotificationHandler<>)); // both handlers triggered in given sequence: base,child
            // nothing: everything works as expected - base,but switching between handlers is rather slow
        });
    });

    container.Populate(services);

    return container.GetInstance<IServiceProvider>();
}

Program.cs

public class Program
{
    public static void Main(string[] args)
    {
        CreateHostBuilder(args).Build().Run();
    }

    public static IWebHostBuilder CreateHostBuilder(string[] args) =>
        WebHost.CreateDefaultBuilder(args)
            .UseStructureMap()
            .UseStartup<Startup>();
}

在StructureMap之前，我的配置是这样的

services.AddTransient<INotificationHandler<SpecificUserRegisteredNotification>,SendEmailConfirmationEmail>();               
    services.AddTransient<INotificationHandler<OtherSpecificUserRegisteredNotification>,SendEmailConfirmationEmail>();
    services.AddTransient<IRequestHandler<RegisterSpecificCommand,BaseCommandResponse>,RegisterApplicationUserCommandHandler>();
    services.AddTransient<IRequestHandler<RegisterOtherSpecificCommand,RegisterApplicationUserCommandHandler>();