/// <summary>
/// Adds the reference.
/// </summary>
/// <param name='sender'>
/// Sender.
/// </param>
/// <param name='args'>
/// Arguments.
/// </param>
/// <exception cref='FileNotFoundException'>
/// Is thrown when a file path argument specifies a file that does not exist.
/// </exception>
protected void AddReference(object sender, EventArgs args)
{
FileChooserDialog fDlg = new FileChooserDialog("Select Assembly", GtkDialog as Window, FileChooserAction.Open, "Cancel", ResponseType.Cancel, "Open", ResponseType.Accept);
fDlg.Modal = true;
fDlg.DestroyWithParent = true;
fDlg.Close += (s, e) => {
fDlg.Respond(ResponseType.Cancel); };
if (fDlg.Run() == (int)ResponseType.Accept)
{
string path = fDlg.Filename;
if (!File.Exists(path))
throw new FileNotFoundException("Could not open assembly to add to project preferences", path);
if (!updatedReferencePaths.Contains(path))
updatedReferencePaths.Add(path);
RefreshReferencePathsNodeView();
}
fDlg.Destroy();
}