如何在ASP.NET核心中手动注册Mediatr处理程序？

services.AddMediatR(typeof(Startup));

services.AddScoped<IMediator, Mediator>();
services.AddScoped<ServiceFactory>(sp => sp.GetService);
services.AddScoped(typeof(IPipelineBehavior<,>), typeof(RequestPreProcessorBehavior<,>));
services.AddScoped(typeof(IPipelineBehavior<,>), typeof(RequestPostProcessorBehavior<,>));
services.AddScoped(typeof(IPipelineBehavior<,>), typeof(GenericPipelineBehavior<,>));
services.AddScoped(typeof(IPipelineBehavior<,>), typeof(ValidationPipelineBehavior<,>));

services.AddScoped<INotificationHandler<CustomNotification>, CustomNotificationHandler>();
services.AddScoped<IRequestHandler<CustomRequest, CustomResponse>, CustomRequestHandler>();

private readonly IMediator _mediator;

public MyController(IMediator mediator)
{
    _mediator = mediator;
}

public async Task<IActionResult> MyAction()
{
    var response = await _mediator.Send(new MyRequest());
    // 处理响应
    return Ok(response);
}