public string Get(string fileName = "")
        {
            // Response.ContentType = "application/json; charset=utf-8";
            if (string.IsNullOrWhiteSpace(fileName))
            {
                fileName = "";
            }
            fileName = $"/{fileName.Trim('/')}";
            var rootFileInfo = _fileProvider.GetFileInfo(fileName);
            IDirectoryContents dirContents = _fileProvider.GetDirectoryContents(fileName);

            if (rootFileInfo != null && rootFileInfo.Exists && !rootFileInfo.IsDirectory)
            {
                strBuilder.Append("{");
                strBuilder.Append($"\"name\":\"{fileName.Trim('/').Split('/').LastOrDefault()}\",");
                strBuilder.Append($"\"path\":\"{fileName}\",");
                strBuilder.Append($"\"info\":");
                strBuilder.Append("{");
                strBuilder.Append($"\"lastModified\":\"{rootFileInfo.LastModified.LocalDateTime}\",");
                strBuilder.Append($"\"size\":\"{rootFileInfo.Length}\"");
                strBuilder.Append("}");
                strBuilder.Append("}");
            }
            else if (dirContents != null && dirContents.Exists)
            {
                strBuilder.Append("{");
                strBuilder.Append($"\"name\":\"{fileName.Trim('/').Split('/').LastOrDefault()}\",");
                strBuilder.Append($"\"path\":\"{fileName}\",");
                strBuilder.Append("\"children\":[");
                if (dirContents.Count() > 0)
                {
                    Render($"{fileName}");
                    strBuilder.Remove(strBuilder.Length - 1, 1);
                }
                strBuilder.Append("]");
                strBuilder.Append("}");
            }
            else
            {
                strBuilder.Append("{}");
            }

            // JObject o = JObject.Parse(strBuilder.ToString());
            //JArray categories = (JArray)o["children"][1]["children"];
            //JArray categories2 = (JArray)o.SelectToken("children[1].children");
            // Response.ContentType="application/json";
            return(strBuilder.ToString());
            // return Json(o);
        }