WinForm中如何预览Office文件

本文为大家分享了WinForm预览Office文档的方法，供大家参考，具体内容如下

使用WinForm, WPF, Office组件

原理:使用Office COM组件将Word,Excel转换为XPS文档, 将WPF的DocumentViewer控件寄宿到WinForm中, 实现预览.

1. 新建WinForm项目

2. 新建WPF用户控件, 注意是WPF控件

3. 编辑WPF用户控件

<UserControl ...
 ...>
 <Grid>
 <DocumentViewer x:Name="documentViewer"/>
 </Grid>
</UserControl>

VS设计预览显示效果如下:

如果不需要自带的工具栏, 可以添加以下资源隐藏工具栏:

<!--隐藏DocumentViewer边框-->
<UserControl.Resources>
 <Style x:Key="{x:Type DocumentViewer}" TargetType="{x:Type DocumentViewer}">
 <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.WindowTextBrushKey}}" />
 <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}" />
 <Setter Property="FocusVisualStyle" Value="{x:Null}" />
 <Setter Property="Template">
 <Setter.Value>
 <ControlTemplate TargetType="{x:Type DocumentViewer}">
 <Border BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}" Focusable="False">
 <Grid KeyboardNavigation.TabNavigation="Local">
 <Grid.Background>
 <SolidColorBrush Color="{DynamicResource ControlLightColor}" />
 </Grid.Background>
 <Grid.RowDefinitions>
 <RowDefinition Height="Auto" />
 <RowDefinition Height="*" />
 <RowDefinition Height="Auto" />
 </Grid.RowDefinitions>
 <ScrollViewer Grid.Row="1" CanContentScroll="true" HorizontalScrollBarVisibility="Auto" x:Name="PART_ContentHost" IsTabStop="true">
 <ScrollViewer.Background>
 <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
 <GradientStop Color="{DynamicResource ControlLightColor}" Offset="0" />
 <GradientStop Color="{DynamicResource ControlMediumColor}" Offset="1" />
 </LinearGradientBrush>
 </ScrollViewer.Background>
 </ScrollViewer>
 </Grid>
 </Border>
 </ControlTemplate>
 </Setter.Value>
 </Setter>
 </Style>
</UserControl.Resources>

4. 新建WinForm用户控件

在WinForm上添加ElementHost

将WPF用户控件添加到ElementHost上,设计器代码XpsPreviewer.Designer.cs如下

 //ElementHost
 private System.Windows.Forms.Integration.ElementHost elementHost1;
 //XpsPreviewer变量
 private WPF.XpsPreviewer xpsPreviewer1;

 private void InitializeComponent()
 {
 this.elementHost1 = new System.Windows.Forms.Integration.ElementHost();
 this.xpsPreviewer1 = new WPF.XpsPreviewer();

 //初始化
 //其他属性初始化...
 this.elementHost1.Child = this.xpsPreviewer1;
 //其他属性初始化...
 }

在XpsPreviewer.cs后台代码中定义方法:

 /// <summary>
 /// 加载XPS文件
 /// </summary>
 /// <param name="fileName">XPS文件名</param>
 internal void LoadXps(string fileName)
 {
 var xpsDocument = new XpsDocument(fileName, FileAccess.Read);
 this.xpsPreviewer1.documentViewer.Document = xpsDocument.GetFixedDocumentSequence();
 xpsDocument.Close();
 }

5. 将Excel(Word类似)转换为XPS文件

通过Nuget包管理控制台安装COM组件:

PM> Install-Package Microsoft.Office.Interop.Excel

转换为XPS:

 /// <summary>
 /// 将Excel文件转换为XPS文件
 /// </summary>
 /// <param name="execelFileName">Excel文件名</param>
 /// <param name="xpsFileName">转换的xps文件名</param>
 public void ConvertExcelToXps(string excelFileName, string xpsFileName)
 {
 if (string.IsNullOrWhiteSpace(excelFileName))
 throw new ArgumentNullException(excelFileName);
 if (string.IsNullOrWhiteSpace(xpsFileName))
 throw new ArgumentNullException(xpsFileName);

 var fileInfo = new FileInfo(xpsFileName);
 if (!fileInfo.Directory.Exists)
 fileInfo.Directory.Create();

 //删除已存在的文件
 if (File.Exists(xpsFileName))
 File.Delete(xpsFileName);

 Excel.Application app = new Excel.Application();
 app.DisplayAlerts = false;
 Excel.Workbooks wbs;
 Excel.Workbook wb;

 wbs = app.Workbooks;
 wb = wbs.Add(excelFileName);
 dynamic Nothing = System.Reflection.Missing.Value;
 wb.ExportAsFixedFormat(Excel.XlFixedFormatType.xlTypeXPS, xpsFileName, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing);
 wb.Close(true);
 wbs.Close();
 app.Quit();
 KillExcelProcess(app);
 }

扩展: 每次调用Excel打开文件,均会产生一个进程, 在网络上收集的释放Excel进程方式均不起作用. 因此选择直接结束进程, 根据Excel句柄结束进程, 而不是根据进程名称杀死全部正在运行的Excel.

 [DllImport("User32.dll")]
 private static extern int GetWindowThreadProcessId(IntPtr hWnd, out int ProcessId);

 /// <summary>
 /// 结束Excel进程
 /// </summary>
 /// <param name="obj"></param>
 private void KillExcelProcess(Excel.Application app)
 {
 if (app == null)
 return;
 try
 {
 IntPtr intptr = new IntPtr(app.Hwnd);
 int id;
 GetWindowThreadProcessId(intptr, out id);
 var p = Process.GetProcessById(id);
 p.Kill();
 }
 catch { }
 }

现在已经可以正常的预览Excel文件了. 由于Excel另存为XPS文件会耗费一定的时间, 因此建议在后台线程中提前异步生成, 在预览时可直接调取XPS文件.