.net core 在服务器端获取api传递的参数

//从文件流中读取传递测参数
            using (var ms = new MemoryStream())
            {
                context.HttpContext.Request.Body.Seek(0, 0);//将读取指针迻到开始位置
                context.HttpContext.Request.Body.CopyTo(ms);
                var b = ms.ToArray();
                var postParamsString = Encoding.UTF8.GetString(b);
            }

public class SignValidateAttribute : ActionFilterAttribute
    {
        #region
        /// 

        /// 
        /// 
        /// 
        /// 
        /// 
        public async override Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
        {
            //从文件流中读取传递测参数
            using (var ms = new MemoryStream())
            {
                context.HttpContext.Request.Body.Seek(0, 0);
                context.HttpContext.Request.Body.CopyTo(ms);
                var b = ms.ToArray();
                var postParamsString = Encoding.UTF8.GetString(b);
                await next();
            }
        }

        /// 

        /// 
        /// 
        /// 
        /// 
        /// 
        public override Task OnResultExecutionAsync(ResultExecutingContext context, ResultExecutionDelegate next)
        {
            //string dataJson = GetContextJson(context.);
            return base.OnResultExecutionAsync(context, next);
        }
        #endregion

    }