支付回调: 获取HttpRequest的body内容,之前使用Request.Form有时候数据请求不到(可能是跟.net core 版本有关?) var s = HttpRequest.Body; int count; var buffer = new byte[1024]; var builder = new StringBuilder(); while ((count = s.Read(buffer, 0, 1024)) > 0) { builder.Append(Encoding.UTF