C#代码：
string printFileName = @"C:/TestForPrint.xps";
public void InvokePrint(object sender, RoutedEventArgs e)
{
// 打印对话框，设置属性
PrintDialog pDialog = new PrintDialog();
pDialog.PageRangeSelection = PageRangeSelection.AllPages;
pDialog.UserPageRangeEnabled = true;
// 这里你还可以设置对话框的MaxPage, MinPage, PageRange, PrintableAreaHeight, PrintableAreaWidth, PrintQueue, PrintTicket属性值等。
// 显示对话框，如果用户点击“打印”按钮，则返回true。
Nullable<Boolean> print = pDialog.ShowDialog();
if (print == true)
{
XpsDocument xpsDocument = new XpsDocument(printFileName, FileAccess.ReadWrite);
FixedDocumentSequence fixedDocSeq = xpsDocument.GetFixedDocumentSequence();
pDialog.PrintDocument(fixedDocSeq.DocumentPaginator, "Test print");
}
}