如何在ActionFilter中获取已注册的GlobalFilters列表

public class MvcApplication : System.Web.HttpApplication
{
    protected void Application_Start()
    {
        // 注册全局过滤器
        GlobalFilters.Filters.Add(new MyActionFilter());
        // 其他初始化代码
    }
}

public class MyActionFilter : ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        // 获取已注册的全局过滤器列表
        var globalFilters = GlobalFilters.Filters;
        
        // 遍历全局过滤器列表
        foreach (var filter in globalFilters)
        {
            // 处理每个全局过滤器
            // ...
        }
        
        base.OnActionExecuting(filterContext);
    }
}