如何打印而不显示打印对话？

Question

我有这个演示应用程序，我需要打印FlowDocument而不从操作系统弹出打印对话框。你知道怎么做吗？或者你知道其他可能的解决方案吗？

private void Button_Click(object sender, RoutedEventArgs e)
{
    PrintDialog pd = new PrintDialog();
    pd.ShowDialog();
    if (pd.ShowDialog() != true) return;

    flowDocument.PageHeight = pd.PrintableAreaHeight;
    flowDocument.PageWidth = pd.PrintableAreaWidth;

    IDocumentPaginatorSource idocument = flowDocument as IDocumentPaginatorSource;

    pd.PrintDocument(idocument.DocumentPaginator, "Printing Flow Document...");
}

Answer 1

删除这一行：

pd.ShowDialog();
if (pd.ShowDialog() != true) return;