asp.net WebApi自定义权限验证消息返回

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/// <summary>    /// 自定义鉴权    /// </summary>    public class WebApiAuthAttribute : AuthorizeAttribute    {        /// <summary>        /// 权限验证        /// </summary>        /// <param name="actionContext"></param>        public override void OnAuthorization(HttpActionContext actionContext)        {            V_UserLogin UserInfo = Models.User.UserInfo.UserData;            if (UserInfo == null)            {                actionContext.Response = actionContext.Request.CreateResponse(HttpStatusCode.Unauthorized, "请先登录！", "application/json");            }            else if (string.IsNullOrEmpty(Roles) == false && Roles.Split('、').Any(p => p == UserInfo.UserType) == false)            {                actionContext.Response = actionContext.Request.CreateResponse(HttpStatusCode.Forbidden, "你没有访问权限！", "application/json");            }            else            {                base.IsAuthorized(actionContext);//为此请求授权            }        }    }