如何在 ASP.NET Core MVC 中读取操作方法的属性

基于this article，我正在try 为ASP.NET Core创建一个IActionFilter实现，它可以处理控制器上标记的属性和控制器的操作.尽管读取控制器的属性很容易，但我无法找到读取操作方法上定义的属性的方法.

以下是我现在掌握的代码:

public sealed class ActionFilterDispatcher : IActionFilter
{
    private readonly Func<Type, IEnumerable> container;

    public ActionFilterDispatcher(Func<Type, IEnumerable> container)
    {
        this.container = container;
    }

    public void OnActionExecuting(ActionExecutingContext context)
    {
        var attributes = context.Controller.GetType().GetCustomAttributes(true);

        attributes = attributes.Append(/* how to read attributes from action method? */);

        foreach (var attribute in attributes)
        {
            Type filterType = typeof(IActionFilter<>).MakeGenericType(attribute.GetType());
            IEnumerable filters = this.container.Invoke(filterType);

            foreach (dynamic actionFilter in filters)
            {
                actionFilter.OnActionExecuting((dynamic)attribute, context);
            }
        }
    }

    public void OnActionExecuted(ActionExecutedContext context)
    {
        throw new NotImplementedException();
    }
}

我的问题是:如何在ASP中读取操作方法的属性.网络核心MVC？