如何在不显示打印对话的情况下打印？

Question

我有这个演示应用程序，我需要打印FlowDocument而不会弹出操作系统中的打印对话。你有什么想法如何做到这一点？或者你知道其他可能的解决方案？

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

删除此行：

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