net core 2.1快速获取请求头里面的参数

 public class HttpHeadersExtend
    {

        private IHttpContextAccessor accessor;

       // public string token { get; set; }

        public HttpHeadersExtend(IHttpContextAccessor _accessor)
        {
            accessor = _accessor;
            //token = HttpContext.Current.Request.Headers.GetValues("token");//Request
        }

        public string GetString(string key)
        {

            var dic = accessor.HttpContext.Request.Headers;

            if (dic.ContainsKey(key))
            {
                return dic[key];
            }

            return null;
        }

    }