asp.net-core-mvc - 修改asp.net core mvc中DefaultControllerFactory的CreateController方法中的ControllerContext

Question

• 我想覆盖我的控制器方法。在这里，如果对CatalogController提出请求，我已经覆盖了DefaultControllerFactory的CreateController方法以返回CatalogCustomController对象。

但问题在于我需要将所有依赖项传递给控制器​​构造函数。

 public class CustomControllerFactory: DefaultControllerFactory
{  
    public CustomControllerFactory(ICatalogModelFactory catalogModelFactory,
        IProductModelFactory productModelFactory,
        IControllerActivator controllerActivator, IEnumerable<IControllerPropertyActivator> propertyActivators)
        :base(controllerActivator, propertyActivators)
    {
        this._catalogModelFactory = catalogModelFactory;
        this._productModelFactory = productModelFactory;
    }
    public override object CreateController(ControllerContext context)
    {
        if (context.ActionDescriptor.ControllerTypeInfo.AsType() == typeof(CatalogController))
        {
            return new CatalogCustomController(_catalogModelFactory,
            _productModelFactory,
            _categoryService, 
        }

        return base.CreateController(context);
    }
}

虽然我想做这样的事情，但通过修改 ControllerContext 上下文

 public override object CreateController(ControllerContext context)
    {
        if (context.ActionDescriptor.ControllerTypeInfo.AsType() == typeof(CatalogController))
        {

            context.ActionDescriptor.ControllerName = "CatalogCustomController";   
        }

        return base.CreateController(context);
    }

Answer 1

您可以尝试 register Controllerinto IServiceCollection，然后Controller从IServiceCollectionin检索CreateController。

1. 扩展方法AddControllersAsServices

   public static class Extension
   {
   public static IMvcBuilder AddControllersAsServices(this IMvcBuilder builder)
   {
       var feature = new ControllerFeature();
       builder.PartManager.PopulateFeature(feature);
   
       foreach (var controller in feature.Controllers.Select(c => c.AsType()))
       {
           builder.Services.TryAddTransient(controller, controller);
       }
   
       builder.Services.Replace(ServiceDescriptor.Transient<IControllerActivator, ServiceBasedControllerActivator>());
   
       return builder;
   }
   }
   

2. 注册服务

       services.AddMvc()
           .AddControllersAsServices();
   

3. CustomControllerFactory

    public class CustomControllerFactory : DefaultControllerFactory
    {
   public CustomControllerFactory(
       IControllerActivator controllerActivator, IEnumerable<IControllerPropertyActivator> propertyActivators)
       : base(controllerActivator, propertyActivators)
   {
   }
   public override object CreateController(ControllerContext context)
   {
       if (context.ActionDescriptor.ControllerTypeInfo.AsType() == typeof(CatalogController))
       {               
           return context.HttpContext.RequestServices.GetRequiredService(typeof(CatalogCustomController));
       }
   
       return base.CreateController(context);
   }
   }
   

Answer 2

我找到了一个解决方案，无需将控制器注册为服务。

• 从主控制器继承自定义控制器。
• 在自定义控制器工厂中，获取请求的控制器的类型。
• 将 ControllerTypeInfo 替换为自定义的

公共覆盖对象 CreateController(ControllerContext 上下文)
    {
        类型 typeOfController = context.ActionDescriptor.ControllerTypeInfo.UnderlyingSystemType;


    if (typeOfController == typeof(Nop.Web.Controllers.CatalogController))
    {
        context.ActionDescriptor.ControllerTypeInfo = typeof(Controllers.CatalogCustomController).GetTypeInfo();
    }
    else if (typeOfController == typeof(Nop.Web.Areas.Admin.Controllers.ProductController))
    {
        context.ActionDescriptor.ControllerTypeInfo = typeof(Areas.Admin.Controllers.ProductCustomController).GetTypeInfo();
    }
    return base.CreateController(context);  
}<pre>