Question

据我所知，每个动作过滤器都应该继承IActionFilter和FilterAttribute。例如：

public class ActionSpeedProfilerAttribute : FilterAttribute, IActionFilter 
{ 
     public void OnActionExecuted(ActionExecutedContext filterContext) 
     { 
         throw new NotImplementedException(); 
     }
    public void OnActionExecuting(ActionExecutingContext filterContext) 
     { 
         throw new NotImplementedException(); 
     } 
}

http://www.dotnetcurry.com/aspnet-mvc/976/aspnet-mvc-custom-action-filter

但是在Microsoft的ASP.NET .Core教程中我们有没有FilterAttribute的例子：

public class SampleActionFilter : IActionFilter
    {
        public void OnActionExecuting(ActionExecutingContext context)
        {
            // do something before the action executes
        }

        public void OnActionExecuted(ActionExecutedContext context)
        {
            // do something after the action executes
        }
    }

https://docs.microsoft.com/pl-pl/aspnet/core/mvc/controllers/filters

我们应该继承FilterAttribute吗？

Answer 1

如果您只想全局添加过滤器（FilterConfig），则无需使用public class FilterConfig { public static void RegisterGlobalFilters(GlobalFilterCollection filters) { filters.Add(new SampleActionFilter()); } }，如下所示：

IActionFilter

...这将使每个操作都执行此过滤器，因为它实现了FilterAttribute。

现在，如果您想创建一个可用于特定操作的过滤器，那么继承public class LogActionAttribute : FilterAttribute, IActionFilter { public void OnActionExecuted(ActionExecutedContext filterContext) { // log something about the action... } public void OnActionExecuting(ActionExecutingContext filterContext) { } } public class HomeController : Controller { [LogAction] public ActionResult Index() { return View(); } }会更好，因为它允许您像这样使用它：

IResultFilter

因此，在这种情况下，您可以选择使用属性执行该过滤器的操作，而不是针对每个操作执行该操作。

作为旁注，还有一个IActionFilter接口，其作用类似于IActionFilter，它在执行结果时和执行结束后触发（同样public class LogActionAttribute : ActionFilterAttribute { public override void OnActionExecuted(ActionExecutedContext filterContext) { } public override void OnActionExecuting(ActionExecutingContext filterContext) { } public override void OnResultExecuted(ResultExecutedContext filterContext) { } public override void OnResultExecuting(ResultExecutingContext filterContext) { } }，但结果改为行动）。

这样做：

public class LogActionAttribute : FilterAttribute, IActionFilter, IResultFilter
{

    public void OnActionExecuted(ActionExecutedContext filterContext)
    {

    }

    public void OnActionExecuting(ActionExecutingContext filterContext)
    {

    }
    public void OnResultExecuted(ResultExecutedContext filterContext)
    {

    }

    public void OnResultExecuting(ResultExecutingContext filterContext)
    {

    }

}

与：

相同

ActionFilterAttribute

...因为public abstract class ActionFilterAttribute : FilterAttribute, IActionFilter, IResultFilter { ... }完全相同：

time = fields.Many2one('time.project', domain=lambda self: self._get_time())
vehicle_id = fields.Many2one('fleet.vehicle', 'Vehicle', required=True)
def _get_time(self):
   vehicle_val = Get selected vehicle id from field vehicle_id on current form.

   times = self.env['project.vehicle'].search([('vehicle_id', '=', vehicle_val)

自定义操作过滤器应该继承FilterAttribute吗？

1 个答案: