需要打开PDF文件时，我们第一印象就是使用Adobe Reader。在开发中，经常会遇到需要展示PDF文件的需求。我们会借助于Adobe Reader的Active控件来实现。不过这需要客户的机器上安装有Adobe Reader，并且使用Adobe Reader的Active控件会在顶部有一个隐藏不了的工具栏。这样显然不合理。
在Github上看到一个非常好的WPF中承载PDF文件的类库。
https://github.com/reliak/moonpdf
使用非常简单，本篇博客将介绍使用MoonPdf类库来展示PDF文件。在Sourceforge上下载到MoonPdf编译好的Dll。下面通过一个WPF程序来演示，
1. 工程中添加对MoonPdfLib.dll的引用，另外记得将libmupdf.dll放置于WPF工程Bin文件下。
2. 代码：
XAML:
<Window x:Class="WPFPdfViewer.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:mpp="clr-namespace:MoonPdfLib;assembly=MoonPdfLib"
xmlns:local="clr-namespace:WPFPdfViewer"
mc:Ignorable="d"
Title="WPF Pdf Viewer" Height="350" Width="525">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions> <Border Background="#f0f0f0">
<StackPanel HorizontalAlignment="Left" Orientation="Horizontal">
<Button Content="文件" Width="50" Click="FileButton_Click" Margin="5,5"/> <Button Content="放大" Width="50" Click="ZoomInButton_Click" Margin="0,5"/> <Button Content="缩小" Width="50" Click="ZoomOutButton_Click" Margin="5,5"/> <Button Content="100%" Width="50" Click="NormalButton_Click" Margin="0,5"/> <Button Content="整页" Width="50" Click="FitToHeightButton_Click" Margin="5,5"/> <Button Content="单页" Width="50" Click="SinglePageButton_Click" Margin="0,5"/> <Button Content="双页" Width="50" Click="FacingButton_Click" Margin="5,5"/>
</StackPanel>
</Border> <Border Background="#d3d3d3" Grid.Row="1">
<mpp:MoonPdfPanel x:Name="moonPdfPanel" Background="LightGray" ViewType="SinglePage" PageRowDisplay="ContinuousPageRows" PageMargin="0,2,4,2" AllowDrop="True"/>
</Border>
</Grid>
</Window>
C#:
public partial class MainWindow : Window
{
private bool _isLoaded = false;
public MainWindow()
{
InitializeComponent();
} private void FileButton_Click(object sender, RoutedEventArgs e)
{
var dialog = new OpenFileDialog(); if (dialog.ShowDialog().GetValueOrDefault())
{
string filePath = dialog.FileName; try
{
moonPdfPanel.OpenFile(filePath);
_isLoaded = true;
}
catch (Exception)
{
_isLoaded = false;
}
}
} private void ZoomInButton_Click(object sender, RoutedEventArgs e)
{
if(_isLoaded)
{
moonPdfPanel.ZoomIn();
}
} private void ZoomOutButton_Click(object sender, RoutedEventArgs e)
{
if(_isLoaded)
{
moonPdfPanel.ZoomOut();
}
} private void NormalButton_Click(object sender, RoutedEventArgs e)
{
if(_isLoaded)
{
moonPdfPanel.Zoom(1.0);
}
} private void FitToHeightButton_Click(object sender, RoutedEventArgs e)
{
moonPdfPanel.ZoomToHeight();
} private void FacingButton_Click(object sender, RoutedEventArgs e)
{
moonPdfPanel.ViewType = MoonPdfLib.ViewType.Facing;
} private void SinglePageButton_Click(object sender, RoutedEventArgs e)
{
moonPdfPanel.ViewType = MoonPdfLib.ViewType.SinglePage;
}
}
3. 运行程序，打开PDF文件，
代码点击这里下载。
MoonPdf的原理是将Pdf文件转成了图片文件，然后再显示出来的。MoonPdf的开发者在CodePlex上的这篇文章介绍了MoonPdf了，非常不错。
感谢您的阅读。