WPF开发随笔收录-查看PDF文件

一、前言

在项目的开发过程中，涉及到查看服务器生成的pdf报告文件的查看，起初的方案是通过spire.pdf这个库来将pdf文件转换成图片，然后在进行查看。但是经常被吐槽预览不清晰，后面上网发现了一个专门的pdf预览库，能够清晰的查看pdf文件，同时也支持放大缩小等功能；

二、正文

1、查看pdf文件所用到的库是MoonPdf类库，源码地址：https://github.com/reliak/moonpdf

2、使用方法也很简单，项目中添加对MoonPdfLib.dll的引用，然后记得把libmupdf.dll拷贝到项目的bin目录的debug或者release目录下

3、这里直接贴出网上找的例子的代码，实测可用

<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:local="clr-namespace:WPFPdfViewer"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:mpp="clr-namespace:MoonPdfLib;assembly=MoonPdfLib"
    Title="WPF Pdf Viewer"
    Width="525"
    Height="350"
    mc:Ignorable="d">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>

        <Border Background="#f0f0f0">
            <StackPanel HorizontalAlignment="Left" Orientation="Horizontal">
                <Button
                    Width="50"
                    Margin="5,5"
                    Click="FileButton_Click"
                    Content="文件" />

                <Button
                    Width="50"
                    Margin="0,5"
                    Click="ZoomInButton_Click"
                    Content="放大" />

                <Button
                    Width="50"
                    Margin="5,5"
                    Click="ZoomOutButton_Click"
                    Content="缩小" />

                <Button
                    Width="50"
                    Margin="0,5"
                    Click="NormalButton_Click"
                    Content="100%" />

                <Button
                    Width="50"
                    Margin="5,5"
                    Click="FitToHeightButton_Click"
                    Content="整页" />

                <Button
                    Width="50"
                    Margin="0,5"
                    Click="SinglePageButton_Click"
                    Content="单页" />

                <Button
                    Width="50"
                    Margin="5,5"
                    Click="FacingButton_Click"
                    Content="双页" />
            </StackPanel>
        </Border>

        <Border Grid.Row="1" Background="#d3d3d3">
            <mpp:MoonPdfPanel
                x:Name="moonPdfPanel"
                AllowDrop="True"
                Background="LightGray"
                PageMargin="0,2,4,2"
                PageRowDisplay="ContinuousPageRows"
                ViewType="SinglePage" />
        </Border>
    </Grid>
</Window>

using Microsoft.Win32;
using System;
using System.Windows;
using MoonPdfLib.MuPdf;

namespace WPFPdfViewer
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    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;
        }
    }
}