打印与WPF中的动态数据的FlowDocument [英] Printing a flowdocument with dynamic data in WPF

问题描述

我想找到打印在WPF流文档的好方法。我想是有可能怎么看文件原来是我设计的，因此，因此营造一个纯粹的FlowDocument为XAML是出了问题（如Visual Studio中不会显示在设计视图的话）。

I am trying to find a good way to print a flow document in WPF. What I want is to have a possibility to see how the document turns out as I design it, so therefore creating a pure FlowDocument as a XAML is out of the questions (as Visual Studio wont show the design view for it).

那么，我现在所做的就是创建一个包含的FlowDocument这样的（有些过度的部分已被删除，使code更consise）的窗口：

So what I have done now is to create a window that contains a FlowDocument like this (some excessive parts have been removed to make the code more consise):

<Window x:Class="MyNamespace.ProjectPrintout...>
  <Grid>
    <FlowDocumentReader>
      <FlowDocument ColumnWidth="500" Name="Document">
        <!-- Header -->
        <Paragraph Name="HeaderText">
          The header will go here
        </Paragraph>
      </FlowDocument>
    </FlowDocumentReader>
  </Grid>
</Window>

这是一个有点奇怪，因为我永远都不会显示这个窗口给用户，而我只换了FlowDocument的一个窗口，这样我可以看到它的样子，因为我开发它。这活的人生指明使用。

This is a bit strange since I will never show this Window to the user, and I only wrap the FlowDocument with a Window so that I can see how it looks like as I develop it. This Ican live with.

所以别人在我的应用程序的某个地方，我需要打印的FlowDocument到默认打印机，但我也必须动态地设置页眉（除了需要动态的数据在这里被省略了文件的许多其他部分）。

So somewhere else in my application, I want to print this FlowDocument to the default printer, but I also have to set the header dynamically (in addition to many other parts of the documents that needs dynamic data that are omitted here).

在code打印看起来是这样的：

The code to print looks like this:

  var printout = new ProjectPrintout();
  printout.HeaderText= new Paragraph(new Run("Proper header text"));
  var document = printout.Document;

  var pd = new PrintDialog();
  IDocumentPaginatorSource dps = document;
  pd.PrintDocument(dps.DocumentPaginator, "Document");

该文件得到打印的，看起来正常，只是此时的标题文字仍显示头会在这里，即使我从我的code以适当的标题文字取而代之。我也试图改变这样的：

The document is getting printed, and looks fine except that the header text still shows "The header will go here", even if I replaced it from my code with "Proper header text". I also tried changing it like this:

(printout.HeaderText.Inlines.FirstInline as Run).Text = "Proper header text";

但结果是相同的。

But the result is the same.

所以，问题是：我如何可以更改的FlowDocument的内容从code之前，我打印出来，或者有更好的方法做的，而不是我的方法这个

So the question is: How can I change the contents in the FlowDocument from code before I print it, or are there a better way to do this instead of my approach?

推荐答案

MVVM 救援：

顿悟：用户界面是不是数据。用户界面是不是一个数据存储。 UI是为了显示数据，而不是存储它。

1 - 创建一个简单的对象来保存你的数据。

1 - Create a simple object to hold your data

public class MyDocumentViewModel: INotifyPropertyChanged //Or whatever viewmodel base class
{
    private string _header;
    public string Header 
    {
        get { return _header; }
        set
        {
            _header = value;
            NotifyPropertyChange(() => Header);
         }
     }

     //Whatever other data you need
}

2 - 定义绑定 S在您的文档;

2 - Define Bindings in your Document;

<Paragraph>
    <Run Text="{Binding Header}"/>
</Paragraph>

3 - 设置你的FlowDocument的的DataContext 这个类的一个实例：

3 - Set your FlowDocument's DataContext to an instance of this class:

var flowdoc = new YourFlowDocument();
var data = new MyDocumentViewModel { Header = "this is the Header" };
//whatever other data

flowdoc.DataContext = data;

//do the printing stuff.

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