public JsonResult ListDir()
{
StringBuilder result = new StringBuilder();
List <DirectoryInfo> info = DirectoryUtil.GetAllDirecrotiesUnderDirectory(Environment.CurrentDirectory);
//result.AppendLine($"There are {info.GetFiles().Length} files in folder {Environment.CurrentDirectory}")
foreach (DirectoryInfo directory in info)
{
result.AppendLine($"Directory {directory.FullName}, modified: {directory.LastWriteTimeUtc}");
}
return(Json(result.ToString()));
}