为Wpf DocumentViewer PrintDialog设置PageOrientation [英] Setting PageOrientation for the Wpf DocumentViewer PrintDialog

问题描述

使用Wpf DocumentViewer控件，我无法弄清楚如何在用户单击打印按钮时在DocumentViewer显示的PrintDialog上设置PageOrientation.有没有办法迷上这个?

Using the Wpf DocumentViewer control I can't figure out how to set the PageOrientation on the PrintDialog that the DocumentViewer displays when the user clicks the print button. Is there a way to hook into this?

推荐答案

迈克的答案有效.我选择实现它的方法是改为创建自己的从DocumentViewer派生的doc查看器.另外，将Document属性强制转换为FixedDocument对我不起作用-强制转换为FixedDocumentSequence.

Mike's answer works. The way I chose to implement it was to instead create my own doc viewer derived from DocumentViewer. Also, casting the Document property to FixedDocument wasn't working for me - casting to FixedDocumentSequence was.

GetDesiredPageOrientation是您需要的任何内容.就我而言，我正在检查第一页的尺寸，因为我生成的文档的尺寸和方向对于文档中的所有页面都是一致的，并且序列中只有一个文档.

GetDesiredPageOrientation is whatever you need it to be. In my case, I'm inspecting the first page's dimensions, because I generate documents that are uniform size and orientation for all pages in the document, and with only one doc in the sequence.

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Controls;
using System.Windows.Xps;
using System.Printing;
using System.Windows.Documents;

public class MyDocumentViewer : DocumentViewer
{
    protected override void OnPrintCommand()
    {
        // get a print dialog, defaulted to default printer and default printer's preferences.
        PrintDialog printDialog = new PrintDialog();
        printDialog.PrintQueue = LocalPrintServer.GetDefaultPrintQueue();
        printDialog.PrintTicket = printDialog.PrintQueue.DefaultPrintTicket;

        // get a reference to the FixedDocumentSequence for the viewer.
        FixedDocumentSequence docSeq = this.Document as FixedDocumentSequence;

        // set the default page orientation based on the desired output.
        printDialog.PrintTicket.PageOrientation = GetDesiredPageOrientation(docSeq);

        if (printDialog.ShowDialog() == true)
        {
            // set the print ticket for the document sequence and write it to the printer.
            docSeq.PrintTicket = printDialog.PrintTicket;

            XpsDocumentWriter writer = PrintQueue.CreateXpsDocumentWriter(printDialog.PrintQueue);
            writer.WriteAsync(docSeq, printDialog.PrintTicket);
        }
    }
}

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