async void ShowUnusedImage(CancellationTokenSource cts)
{
var unusedImageAttachList = await SendService.LoadUnusedAttachFilesAsync(cts);
if (unusedImageAttachList != null && unusedImageAttachList.Count > 0)
{
if (AttachFileList == null)
{
AttachFileList = new ObservableCollection <AttachFileItemModel>();
}
var list = AttachFileList.ToList();
foreach (var item in unusedImageAttachList)
{
if (list.Count(i => i.Id.Equals(item.Id)) == 0)
{
AttachFileList.Add(item);
}
}
}
}
