.net core 在服务器端获取api传递的参数

在 ActionFilterAttribute 的OnActionExecutionAsync 中使用如下代码从流中读取用户参数

//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);
            }

　虽然以前就知道是从流中读取，但是.net core的比较难找，找了将近两个小时才找到从流中读取参数的方法，关键是这句：context.HttpContext.Request.Body.Seek(0, 0);不然读取的内容为空

完整代码

public class SignValidateAttribute : ActionFilterAttribute
    {
        #region
        /// <summary>
        ///
        /// </summary>
        /// <param name="context"></param>
        /// <param name="next"></param>
        /// <returns></returns>
        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();
            }
        }

        /// <summary>
        ///
        /// </summary>
        /// <param name="context"></param>
        /// <param name="next"></param>
        /// <returns></returns>
        public override Task OnResultExecutionAsync(ResultExecutingContext context, ResultExecutionDelegate next)
        {
            //string dataJson = GetContextJson(context.);
            return base.OnResultExecutionAsync(context, next);
        }
        #endregion

    }