private void CreateWorkDirectory(UserSetting setting)
{
var work = IoEx.Path.Combine(setting.LibPath, IoEx.Path.GetRandomFileName());
if (IoEx.File.Exists(work)) IoEx.File.Delete(work);
if (IoEx.Directory.Exists(work)) IoEx.Directory.Delete(work, true);
IoEx.Directory.CreateDirectory(work);
Path.WorkingDirectory = work;
AddMessage(string.Format("CreateWorkDirectory: {0}", work));
}