以日志的方式记录http请求

环境：net core 5.0

public class LogAttribute : ActionFilterAttribute {
        private string LogFlag { get; set; }
        private string ActionArguments { get; set; }
        /// <summary>
        /// 请求体中的全部值
        /// </summary>
        private string RequestBody { get; set; }
        private Stopwatch Stopwatch { get; set; }
        public LogAttribute(string logFlag) {
            LogFlag = logFlag;
        }
        public override void OnActionExecuting(ActionExecutingContext context) {
            base.OnActionExecuting(context);
            // 后续添加了获取请求的请求体，若是在实际项目中不须要删除便可
            long contentLen = context.HttpContext.Request.ContentLength == null ? 0 : context.HttpContext.Request.ContentLength.Value;
            if (contentLen > 0) {
                // 读取请求体中全部内容
                System.IO.Stream stream = context.HttpContext.Request.Body;
                if (context.HttpContext.Request.Method == "POST") {
                    stream.Position = 0;
                }
                byte[] buffer = new byte[contentLen];
                stream.Read(buffer, 0, buffer.Length);
                // 转化为字符串
                RequestBody = System.Text.Encoding.UTF8.GetString(buffer);
            }
            ActionArguments = Newtonsoft.Json.JsonConvert.SerializeObject(context.ActionArguments);
            Stopwatch = new Stopwatch();
            Stopwatch.Start();
        }
        public override void OnActionExecuted(ActionExecutedContext context) {
            base.OnActionExecuted(context);
            Stopwatch.Stop();
            string url = context.HttpContext.Request.Host + context.HttpContext.Request.Path + context.HttpContext.Request.QueryString;
            string method = context.HttpContext.Request.Method;
            string qs = ActionArguments;
            dynamic result = context.Result.GetType().Name == "EmptyResult" ? new { Value = "无返回结果" } : context.Result as dynamic;
            string res = "在返回结果前发生了异常";
            try {
                if (result != null) {
                    res = Newtonsoft.Json.JsonConvert.SerializeObject(result.Value);
                }
            } catch (System.Exception) {
                res = "日志未获取到结果，返回的数据没法序列化";
            }
            LogException.AddLog($"\n 方法：{LogFlag} \n " +
                $"地址：{url} \n " +
                $"方式：{method} \n " +
                $"请求体：{RequestBody} \n " +
                $"参数：{qs}\n " +
                $"结果：{res}\n " +
                $"耗时：{Stopwatch.Elapsed.TotalMilliseconds} 毫秒（指控制器内对应方法执行完毕的时间）");
        }
    }