WPF实现文档打印的功能

先贴代码：

private void OnPrint()
{
    var dialog = new PrintDialog();
    if (dialog.ShowDialog() != true)
    {
        return;
    }

    var doc = _viewer.Document;
    doc.PageHeight = dialog.PrintableAreaHeight;
    doc.PageWidth = dialog.PrintableAreaWidth;

    IDocumentPaginatorSource idocument = doc as IDocumentPaginatorSource;
    dialog.PrintDocument(idocument.DocumentPaginator, "");
}

这里的_viewer是FlowDocumentScrollViewer对象。

前台的XAML：

<FlowDocumentScrollViewer x:Name="viewer">
    <FlowDocument>
        <Section>
            <Paragraph>
                <Run
                    FontFamily="{Binding TitleFont.FontFamily}"
                    FontSize="{Binding TitleSize}"
                    FontWeight="{Binding TitleWeight}"
                    Text="{Binding DocTitle, Mode=OneWay}" />
            </Paragraph>
            <Paragraph>
                <Run
                    FontFamily="{Binding ContentFont.FontFamily}"
                    FontSize="{Binding ContentSize}"
                    FontWeight="{Binding ContentWeight}"
                    Text="{Binding DocContent, Mode=OneWay}" />
            </Paragraph>
        </Section>
    </FlowDocument>
</FlowDocumentScrollViewer>

要打印的文档的内容当然也可以在后台用cs代码来添加。