使用DocumentPaginator进行打印时如何打印预览？

I'm using a class I've derived from DocumentPaginator (see below) to print simple (text only) reports from a WPF application. I've got it so that everything prints correctly, But how do I get it to do a print preview before printing? I have a feeling I need to use a DocumentViewer but I can't figure out how.

我正在使用我从DocumentPaginator派生的类（见下文）来打印来自WPF应用程序的简单（仅文本）报告。我已经准备好了所有内容都能正确打印，但是如何让它在打印之前进行打印预览呢？我有一种感觉，我需要使用DocumentViewer，但我无法弄清楚如何。

Here's my Paginator Class:

这是我的Paginator类：

public class RowPaginator : DocumentPaginator
{
    private int rows;
    private Size pageSize;
    private int rowsPerPage;

    public RowPaginator(int rows)
    {
        this.rows = rows;
    }

    public override DocumentPage GetPage(int pageNumber)
    {
        int currentRow = rowsPerPage * pageNumber;
        int rowsToPrint = Math.Min(rowsPerPage, rows - (rowsPerPage * pageNumber - 1));
        var page = new PageElementRenderer(pageNumber + 1, PageCount, currentRow, rowsToPrint)
                       {
                           Width = PageSize.Width,
                           Height = PageSize.Height
                       };
        page.Measure(PageSize);
        page.Arrange(new Rect(new Point(0, 0), PageSize));
        return new DocumentPage(page);
    }

    public override bool IsPageCountValid { get { return true; } }

    public override int PageCount { get { return (int)Math.Ceiling(this.rows / (double)this.rowsPerPage); } }

    public override Size PageSize
    {
        get { return this.pageSize; }
        set
        {
            this.pageSize = value;
            this.rowsPerPage = PageElementRenderer.RowsPerPage(this.pageSize.Height);
            if (rowsPerPage <= 0)
                throw new InvalidOperationException("Page can't fit any rows!");
        }
    }

    public override IDocumentPaginatorSource Source { get { return null; } }
}

The PageElementRenderer is just a simple UserControl that displays the data (at the moment just a list of rows).

PageElementRenderer只是一个显示数据的简单UserControl（目前只是一个行列表）。

Here's how I use my Row Paginator

这是我使用Row Paginator的方式

PrintDialog dialog = new PrintDialog();
if (dialog.ShowDialog() == true)
{
    var paginator = new RowPaginator(rowsToPrint) { PageSize = new Size(dialog.PrintableAreaWidth, dialog.PrintableAreaHeight) };

    dialog.PrintDocument(paginator, "Rows Document");
}

Sorry for the code dump, but I didn't want to miss something relevant.

很抱歉代码转储，但我不想错过相关的东西。

6 个解决方案

#1

So I got it working after reading Pro WPF in C# 2008 (Page 726).

所以我在C＃2008（页726）中阅读Pro WPF之后就开始工作了。

Basically the DocumentViewer class needs an XPS file to present a print preview of it. So I do the following:

基本上，DocumentViewer类需要一个XPS文件来呈现它的打印预览。所以我做了以下事情：

PrintDialog dialog = new PrintDialog();
var paginator = new RowPaginator(rowsToPrint) { PageSize = new Size(dialog.PrintableAreaWidth, dialog.PrintableAreaHeight) };

string tempFileName = System.IO.Path.GetTempFileName();

//GetTempFileName creates a file, the XpsDocument throws an exception if the file already
//exists, so delete it. Possible race condition if someone else calls GetTempFileName
File.Delete(tempFileName); 
using (XpsDocument xpsDocument = new XpsDocument(tempFileName, FileAccess.ReadWrite))
{
    XpsDocumentWriter writer = XpsDocument.CreateXpsDocumentWriter(xpsDocument);
    writer.Write(paginator);

    PrintPreview previewWindow = new PrintPreview
                                     {
                                         Owner = this,
                                         Document = xpsDocument.GetFixedDocumentSequence()
                                     };
    previewWindow.ShowDialog();
}

I'm creating the print dialog to get the default page size. There's probably a better way to do this. XpsDocument is in ReachFramework.dll (Namespace System.Windows.Xps.Packaging);

我正在创建打印对话框以获取默认页面大小。可能有更好的方法来做到这一点。 XpsDocument位于ReachFramework.dll（Namespace System.Windows.Xps.Packaging）中;

Here's the PrintPreview Window.

这是PrintPreview窗口。

<Window x:Class="WPFPrintTest.PrintPreview"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Name="previewWindow"
    Title="PrintPreview" Height="800" Width="800">
    <Grid>
        <DocumentViewer Name="viewer" 
                        Document="{Binding ElementName=previewWindow, Path=Document}" />
    </Grid>
</Window>

The code behind just has a Document property like so:

后面的代码只有一个Document属性，如下所示：

public IDocumentPaginatorSource Document
{
    get { return viewer.Document; }
    set { viewer.Document = value; }
}

#2

The following code uses a MemoryStream to do a print preview.

以下代码使用MemoryStream进行打印预览。

MemoryStream stream = new MemoryStream();

Package package = Package.Open(stream, FileMode.Create, FileAccess.ReadWrite);

var uri = new Uri(@"memorystream://myXps.xps");
PackageStore.AddPackage(uri, package);
var xpsDoc = new XpsDocument(package);

xpsDoc.Uri = uri;
XpsDocument.CreateXpsDocumentWriter(xpsDoc).Write(paginator);

documentViewer.Document = xpsDoc.GetFixedDocumentSequence();

Remember to use close() and remove package from PackageStore when the print preview is closed.

记得在关闭打印预览时使用close（）并从PackageStore中删除包。

#3

WPF doesn't come with any built-in Print Preview functionality, if you want to do a print preview, you're going to have to construct it yourself. Fortunately, it's shouldn't be that difficult.

WPF没有任何内置的打印预览功能，如果你想进行打印预览，你将不得不自己构建它。幸运的是，它不应该那么困难。

You've already got the pagination code, which creates your DocumentPage objects. These objects contain a Visual, which you can go ahead and display in your UI.

您已经获得了分页代码，它会创建您的DocumentPage对象。这些对象包含一个Visual，您可以继续在UI中显示。

What you'll end up doing, is paginating your entire document, collecting all the DocumentPage objects, then displaying their visuals inside of a scrolling StackPanel or something similar. These are the same DocumentPage objects that you can then send to the printer.

你最终要做的是，对整个文档进行分页，收集所有的DocumentPage对象，然后在滚动的StackPanel或类似内容中显示它们的视觉效果。这些是您可以发送到打印机的相同DocumentPage对象。

#4

The WinForm code for print preview is:

用于打印预览的WinForm代码是：

PrintPreviewDialog PrintPreviewDialog = new PrintPreviewDialog();
PrintPreviewDialog.Document = PrintDocument;
PrintPreviewDialog.ShowDialog();

P.s.: The original poster has commented that this is the wrong answer for an WPF application.

P.s。：原始海报评论说这是WPF应用程序的错误答案。

#5

XpsDocument doc = new XpsDocument("filename.xps", FileAccess.Read);
docViewer.Document = doc.GetFixedDocumentSequence();
doc.Close();

#6

I dont think there is a built in way of doing this

我不认为有这样做的内置方式

Here is how I got it working in NHaml

以下是我在NHaml工作的方式

var documentViewHostDialog = new DocumentDialog();
documentViewHostDialog.LoadDocument(load);
documentViewHostDialog.ShowDialog();

Where "load" is either a FlowDocument or IDocumentPaginatorSource and here is the DocumentDialog http://code.google.com/p/nhaml/source/browse/trunk/src/NHaml.Xps/DocumentDialog.xaml http://code.google.com/p/nhaml/source/browse/trunk/src/NHaml.Xps/DocumentDialog.xaml.cs

其中“load”是FlowDocument或IDocumentPaginatorSource，这里是DocumentDialog http://code.google.com/p/nhaml/source/browse/trunk/src/NHaml.Xps/DocumentDialog.xaml http：// code。 google.com/p/nhaml/source/browse/trunk/src/NHaml.Xps/DocumentDialog.xaml.cs

Hope it works for your case.

希望它适用于您的情况。