Question

我已使用自定义DocumentViewer在我的应用程序中实现了打印预览功能（如下所示）。我在显示预览之前调用PrintDialog.ShowDialog()，以便根据纸张方向正确创建文档。

然而，DocumentViewer打印按钮调用PrintDialog.ShowDialog()提示用户再次选择打印机和选项（他们在预览窗口打开之前已经做过）。

有没有办法让DocumentViewer打印按钮只需打印而不需要调用PrintDialog.ShowDialog()？

以下是我的方法调用：

ReportViewModel.cs

    public void PrintButtonClick(DataGrid dataGrid)
    {
        PrintDialog printDialog = new PrintDialog();
        if (printDialog.ShowDialog() == false)
            return;

        // Get page size based on print dialog printable area (orientation)
        Size pageSize = new Size(printDialog.PrintableAreaWidth, printDialog.PrintableAreaHeight);

        // create new paginator for datagrid
        DataGridDocumentPaginator paginator = new DataGridDocumentPaginator(dataGrid as DataGrid, "Employer Match Report", pageSize, new Thickness(30, 20, 30, 20));
        ...
    }

我这样做是为了能够正确生成具有纵向或横向大小值的分页器。如果没有这个，DocumentViewer中的预览文档可能无法根据所选方向正确显示。

PrintDocumentViewer：DocumentViewer

   protected override void OnPrintCommand()
   {
       PrintDialog printDialog = new PrintDialog();
       printDialog.PrintQueue = LocalPrintServer.GetDefaultPrintQueue();
       printDialog.PrintTicket = printDialog.PrintQueue.DefaultPrintTicket;

       printDialog.PrintTicket.PageOrientation = PageOrientation;
       // Code assumes this.Document will either by a FixedDocument or a FixedDocumentSequence
       FixedDocument fixedDocument = this.Document as FixedDocument;
       FixedDocumentSequence fixedDocumentSequence = this.Document as FixedDocumentSequence;

       if (fixedDocument != null)
           fixedDocument.PrintTicket = printDialog.PrintTicket;

       if (fixedDocumentSequence != null)
           fixedDocumentSequence.PrintTicket = printDialog.PrintTicket;

       XpsDocumentWriter writer = PrintQueue.CreateXpsDocumentWriter(printDialog.PrintQueue);

       if (fixedDocument != null)
           writer.WriteAsync(fixedDocument, printDialog.PrintTicket);

       if (fixedDocumentSequence != null)
           writer.WriteAsync(fixedDocumentSequence, printDialog.PrintTicket);

       // Create Preview Window and show preview
       string s = _previewWindowXaml;
       using (var reader = new System.Xml.XmlTextReader(new StringReader(s)))
       {
           Window preview = System.Windows.Markup.XamlReader.Load(reader) as Window;

           DocumentViewer _docViewer = LogicalTreeHelper.FindLogicalNode(preview, "PrintDocumentViewer") as DocumentViewer;
           _docViewer.Document = (fixedDocument != null) ? fixedDocument as IDocumentPaginatorSource : fixedDocumentSequence as IDocumentPaginatorSource;

           // hide the search bar in the PrintPreview dialog
           ContentControl cc = _docViewer.Template.FindName("PART_FindToolBarHost", _docViewer) as ContentControl;
           cc.Visibility = Visibility.Collapsed;

           preview.ShowDialog();
       }
   }

Answer 1

您可以填写打印机和纸张尺寸属性，然后不显示对话框。

var pd = new PrintDialog();
pd.PrintTicket.PageMediaSize = new PageMediaSize(PageMediaSizeName.NorthAmericaLetter, 816.0, 1056.0);
pd.PrintQueue = new LocalPrintServer().GetPrintQueue("Microsoft Print to PDF");

覆盖Print命令：

<DocumentViewer>
    <DocumentViewer.CommandBindings>
        <CommandBinding Command="ApplicationCommands.Print" Executed="Print_Executed" />
    </DocumentViewer.CommandBindings>
</DocumentViewer>

Answer 2

我希望您现在已经解决了这个问题，但您可以将此问题用作修改DocumentViewer控件模板的基础：

How do you hide a WPF DocumentViewer's menu bars?

有一个MSDN文章的链接，该文章应该向您展示如何修改模板，以便打印按钮执行您想要的操作而不是默认的Print操作。

Answer 3

打印按钮不能轻易被覆盖，但我找到了一种方法。即使它可能被认为是一个肮脏的黑客，最终重要的是结果。

我只是用一个不可见的按钮覆盖了打印按钮（无论如何是第一个按钮），该按钮将点击重定向到我自己的打印功能。在此示例代码中，搜索工具栏也被隐藏，Ctrl + P被禁用：

<Grid>
    <DocumentViewer x:Name="DocumentViewer">
        <DocumentViewer.Resources>
            <Style TargetType="ContentControl">
                <Style.Triggers>
                    <Trigger Property="Name" Value="PART_FindToolBarHost">
                        <Setter Property="Visibility" Value="Collapsed" />
                    </Trigger>
                </Style.Triggers>
            </Style>
        </DocumentViewer.Resources>
        <DocumentViewer.InputBindings>
            <KeyBinding Key="P" Modifiers="Control" Command="ApplicationCommands.NotACommand" />
        </DocumentViewer.InputBindings>
    </DocumentViewer>
    <Button Width="32" Height="32" VerticalAlignment="Top" HorizontalAlignment="Left" Opacity="0.01" Click="OnPrint" ></Button>
</Grid>

WPF DocumentViewer覆盖打印按钮

3 个答案: