if (dialog.ShowDialog() == true)
          {
            if (Building?.FileNames != null)
            {
              foreach (var item in dialog.FileNames)
              {
                if ((bool)(Building?.FileNames?.Any(File => File.FullPath==item)))
                  {
                  MessageBox.Show("item existed! ");
                  }
                  else
                  {
                  File newfile = new File()
                  {
                    FileName = System.IO.Path.GetFileName(item),
                    FullPath = System.IO.Path.GetFullPath(item)
                  };
    
                  Building?.FileNames?.Add(newfile);
                
                  }
              }
            }
            MessageBox.Show($"items {Building?.ImagePaths?.Count}");
          }