The code below demonstrates how to show an open file dialog and set the ItemsSource to a collection containing a filename string for each selected file:
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OpenFileDialog ofd = new OpenFileDialog();
ofd.Multiselect = true;
ofd.ShowDialog();
ObservableCollection<string> thumbnailFiles = new ObservableCollection<string>();
foreach (string fileInfo in ofd.FileNames)
{
thumbnailFiles.Add(fileInfo);
}
thumbnailList.ItemsSource = thumbnailFiles;
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