public void Filter(string txt)
{
if (_filtered.Count == 0)
{
CollectionExtensions.AddRange(_filtered, _clipboardItems);
}
if (string.IsNullOrWhiteSpace(txt) && _filtered.Count > 0)
{
_clipboardItems.Clear();
CollectionExtensions.AddRange(_clipboardItems, _filtered);
_filtered.Clear();
return;
}
List <ClipboardItem> items = (from clipboardItem in _clipboardItems
let isTextMatched = clipboardItem.Data.Text != null && !clipboardItem.Data.Text.Contains(txt, StringComparison.InvariantCultureIgnoreCase)
let isImage = clipboardItem.Data.ClipboardType == ClipboardType.Image
where isTextMatched || isImage
select clipboardItem).ToList();
_clipboardItems.RemoveRange(items);
OnCountChanged(_clipboardItems.Count);
}
