最近又一個需求，需要使用C#代碼打開PDF文件，展示在UI上，很多第三方組件都是收費版本的，我只需要展示在UI上供查看而已，不需要特殊的功能，花錢買一個組件是不值得的，經濟允許的情況，當然應該支持這些開發者的。

下面介紹使用AxPDFViewerLib.dll 組件實現PDF文件瀏覽，打印，雖然是評估版本，也不影響正常的瀏覽，打印，另存等功能。

實現打開一個PDF文件瀏覽如下：

1. 添加組件 AxPDFViewerLib，PDFViewerLib.dll

2. 添加UserControl.cs

在自定義用戶控件中添加axPDFViewer1 控件

將控件鋪滿整個控件，Dock 屬性選擇Fill。

添加代碼，完整代碼如下：

public partial class UserControl1 : UserControl{public UserControl1(){InitializeComponent();}public Boolean bReadonly = false;private void axPDFViewer1\_OnDocumentOpened(object sender, AxPDFViewerLib.\_DPDFViewerEvents\_OnDocumentOpenedEvent e){if (bReadonly){axPDFViewer1.SetReadOnly();}else{}}public void OpenEditable(){OpenFileDialog openFileDialog = new OpenFileDialog();openFileDialog.Filter = "PDF File Formats (\*.pdf)|\*.pdf|All Files (\*.\*) | \*.\* ||";openFileDialog.RestoreDirectory = true;openFileDialog.FilterIndex = 1;if (openFileDialog.ShowDialog() == DialogResult.OK){axPDFViewer1.Toolbars = true;axPDFViewer1.LoadFile(openFileDialog.FileName);bReadonly = false;}}public void OpenReadOnly(){OpenFileDialog openFileDialog = new OpenFileDialog();openFileDialog.Filter = "PDF File Formats (\*.pdf)|\*.pdf|All Files (\*.\*) | \*.\* ||";openFileDialog.RestoreDirectory = true;openFileDialog.FilterIndex = 1;if (openFileDialog.ShowDialog() == DialogResult.OK){axPDFViewer1.Toolbars = false;axPDFViewer1.LoadFile(openFileDialog.FileName);bReadonly = true;}}public void SaveAs(){axPDFViewer1.SaveCopyAs();}public void Print(){axPDFViewer1.PrintWithDialog();}public void ClosePDF(){axPDFViewer1.Clear();}}

3. 主UI設計，后臺代碼設計

完整界面設計：

<Window x:Class="pdfApp.MainWindow"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:local="clr-namespace:pdfApp"Title="MainWindow" Height="350" Width="725" Closed="Window\_Closed"><Window.Resources><Style TargetType="Button"><Setter Property="Margin" Value="3"/></Style></Window.Resources><DockPanel><StackPanel Orientation="Horizontal" DockPanel.Dock="Bottom"><Button x:Name="Open" Click="Open_Click" Content="Open in Editable Mode..." Width="172" /><Button x:Name="ReadOnly" Click="ReadOnly_Click" Content="Open in ReadOnly Mode..." Width="180" /><Button x:Name="SaveAs" Click="SaveAs_Click" Content="Save As..." /><Button x:Name="print" Click="print_Click" Content="Print" Width="66" /><Button x:Name="Close" Click="Close_Click" Content="Close" Width="48" /></StackPanel><WindowsFormsHost DockPanel.Dock="Top" Margin="2"><local:UserControl1 x:Name="_host"/></WindowsFormsHost></DockPanel></Window>

完整后臺代碼如下：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows;using System.Windows.Controls;using System.Windows.Data;using System.Windows.Documents;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Imaging;using System.Windows.Navigation;using System.Windows.Shapes;namespace pdfApp{/// <summary>/// Interaction logic for MainWindow.xaml/// </summary>public partial class MainWindow : Window{public MainWindow(){InitializeComponent();}private void Open_Click(object sender, RoutedEventArgs e){_host.OpenEditable();}private void ReadOnly_Click(object sender, RoutedEventArgs e){_host.OpenReadOnly();}private void SaveAs_Click(object sender, RoutedEventArgs e){_host.SaveAs();}private void print_Click(object sender, RoutedEventArgs e){_host.Print();}private void Close_Click(object sender, RoutedEventArgs e){_host.ClosePDF();}private void Window_Closed(object sender, EventArgs e){_host.ClosePDF();}}}

總結

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