asp.net core的授权过滤器中获取action上的Attribute

今天在做权限开发的时候，在控制器的方法上添加了一些特性，希望在过滤器中获取到这些特性，查找了一些资料，终于找到了办法：

var action = context.ActionDescriptor as ControllerActionDescriptor;
var permission = action.MethodInfo.GetCustomAttribute<PermissionAttribute>();

具体的实现代码如下:

 /// <summary>
 /// 国际差旅住宿标准的保存
 /// </summary>
 /// <returns></returns>
 [AuthorityTypeCodeAttribute("B000051", HtmlReturnResultType.JSON)]
 public ActionResult InternationalHotelSave()

 /// <summary>
 /// 页面请求返回的字符串类型
 /// </summary>
 public enum HtmlReturnResultType
 {
     JSON = 0,
     HTML = 1
 }

 /// <summary>
 /// 页面菜单中权限标识的特性,设置控制器中的方法的权限标识符
 /// </summary>
 [AttributeUsage(AttributeTargets.All, AllowMultiple = false)]
 public class AuthorityTypeCodeAttribute : Attribute
 {
     /// <summary>
     /// 页面的权限标识，也就是 页面标签 的编码，例如: B000051 ,在页面菜单权限中设置
     /// </summary>
     public string AuthorityCode { get; set; }
     /// <summary>
     /// 返回的结果类型
     /// </summary>
     public HtmlReturnResultType ReturnResultType { get; set; }
     /// <summary>
     /// 页面菜单中权限标识的特性
     /// </summary>
     /// <param name="_AuthorityCode"></param>
     /// <param name="htmlReturnResult">页面请求返回的字符串类型</param>
     public AuthorityTypeCodeAttribute(string _AuthorityCode, HtmlReturnResultType htmlReturnResult) {
         this.AuthorityCode= _AuthorityCode;
         this.ReturnResultType = htmlReturnResult;
     }
 }

只摘取过滤器中的部分代码：

 public class GDCActionFilter : IActionFilter
 {
     public void OnActionExecuting(ActionExecutingContext context)
     {
         string lk = GDCUtility.GetParamNoSpace("lk");
         UserInfoModel um = GDCObjectInfosBLL.CurrentUserBLL.GetLoginInfo(lk);

         #region 判断权限
         var action = context.ActionDescriptor as ControllerActionDescriptor;
         var permission = action.MethodInfo.GetCustomAttribute<AuthorityTypeCodeAttribute>();
         if (permission != null)
         {
             string authorityCode = permission.AuthorityCode;
             HtmlReturnResultType htmlReturnResultType = permission.ReturnResultType;
             bool userMenuButtonAuthority = GDCObjectInfosBLL.CurrentAuthorityBLL.UserMenuButtonAuthority(um, authorityCode);
             if (!userMenuButtonAuthority)
             {
                 ResultInfoModel rim = new ResultInfoModel("02", "未授权，非法请求!");
                 if (htmlReturnResultType == HtmlReturnResultType.HTML)
                 {
                     context.Result = GDCHttpContext.GDCGetViewResultError(rim);// result;
                 }
                 else if(htmlReturnResultType == HtmlReturnResultType.JSON)
                 {
                     context.Result = new Microsoft.AspNetCore.Mvc.JsonResult(rim);
                 }
                 return;
             }
         }
         #endregion