Question

我最近在WPF中将PowerPoint文件嵌入为XpsDocument。

这是一个简单的WPF应用程序，我在其中将DocumentViewer属性嵌入到我的MainWindow.xaml网格中：

<Window x:Class="PowerPoint2.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:local="clr-namespace:PowerPoint2"
    mc:Ignorable="d"
    Title="MainWindow" Height="350" Width="525">

<Grid>
    <DocumentViewer
        Name="DocumentviewPowerPoint"
        VerticalAlignment="Top"
        HorizontalAlignment="Left" />
</Grid>

要创建绑定到“DocumentviewPowerPoint”的文档，我将已打开的PowerPoint文件转换为Xps格式，并将此变量绑定到前面提到的XAML属性：

using System;
using System.IO;
using System.Windows;
using System.Windows.Xps.Packaging;
using Microsoft.Office.Core;
using Microsoft.Office.Interop.PowerPoint;
using Application = Microsoft.Office.Interop.PowerPoint.Application;

namespace PowerPoint2
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            const string powerPointFile = @"c:\temp\ppt.pptx";
            var xpsFile = Path.GetTempPath() + Guid.NewGuid() + ".pptx";
            var xpsDocument = ConvertPowerPointToXps(powerPointFile, xpsFile);

            DocumentviewPowerPoint.Document = xpsDocument.GetFixedDocumentSequence();            
        }

        private static XpsDocument ConvertPowerPointToXps(string pptFilename, string xpsFilename)
        {
            var pptApp = new Application();

            var presentation = pptApp.Presentations.Open(pptFilename, MsoTriState.msoTrue, MsoTriState.msoFalse,
            MsoTriState.msoFalse);

            try
            {           
                presentation.ExportAsFixedFormat(xpsFilename, PpFixedFormatType.ppFixedFormatTypeXPS);
            }
            catch (Exception ex)
            {
                MessageBox.Show("Failed to export to XPS format: " + ex);
            }
            finally
            {
                presentation.Close();
                pptApp.Quit();
            }

            return new XpsDocument(xpsFilename, FileAccess.Read);
        }
    }
}

这一切在运行程序时运行良好，显示嵌入WPF的Xps文档：

我的问题是如何进一步修改我的代码，以便将PowerPoint显示为一系列可滚动的幻灯片，如图所示，但作为一个实际的幻灯片放映？我想进一步更新，以便用户在每次单击鼠标时导航到以下幻灯片 - 就像'正确'的演示文稿。我的问题是我不熟悉XpsDocument Apis的用法 - 我不知道是否使用这些来实现我想要的，或者它是在转换为Xps格式的表示变量的设置属性中

Answer 1

我设法解决了我感兴趣的特定问题。

请参阅此博客文章以获取详细说明：

Controlling DocumentViewer methods and properties using MVVM

该解决方案解决了通过调用DocumentViewer方法的相关组合，能够启用单个PowerPoint幻灯片（转换为xps文件格式）以占用可用窗口空间的整个问题的问题。

在按下屏幕按钮以调用RelayCommand时，观察到MainWindowViewModel.cs类中的以下DocumentViewer API调用组合起作用：

public ICommand Command
  {
     get
     {
        return _command ?? (_command = new RelayCommand(
            x =>
            {
               DocumentViewer = MainWindow.GetInstance();

               const string powerPointFile = @"c:\temp\ppt.pptx";
               var xpsFile = Path.GetTempPath() + Guid.NewGuid() + ".xps";
               var xpsDocument = ConvertPowerPointToXps(powerPointFile, xpsFile);

               FixedFixedDocumentSequence = xpsDocument.GetFixedDocumentSequence();
               DocumentViewer.Document = FixedFixedDocumentSequence;

               DocumentViewer.GoToPage(1);
               DocumentViewer.FitToMaxPagesAcross(1);
               WindowState = WindowState.Maximized;
               DocumentViewer.FitToMaxPagesAcross(1);
            }));
     }
  }

并获取DocumentViewer实例本身？我还需要更新MainWindow.xaml.cs以使其返回DocumentViewer对象的实例：

using System.Windows.Controls;

命名空间DocumentView { 公共部分类MainWindow { 私有静态DocumentViewer _docViewer;

  public MainWindow()
  {
     InitializeComponent();
     _docViewer = DocumentViewPowerPoint;
  }

  public static DocumentViewer GetInstance()
  {
     return _docViewer;
  }

} }

其中DocumentViewPowerPoint是MainWindow.xaml中DocumentViewer的名称：

<Window x:Class="DocumentView.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:local="clr-namespace:DocumentView"
    mc:Ignorable="d"
    WindowState="{Binding WindowState, Mode=TwoWay}"
    Title="MainWindow" Height="350" Width="525">

<Window.DataContext>
    <local:MainWindowViewModel />
</Window.DataContext>

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="*" />
        <RowDefinition Height="50" />
    </Grid.RowDefinitions>

    <DocumentViewer 
        Grid.Row="0"
        Document="{Binding FixedFixedDocumentSequence}"
        Name="DocumentViewPowerPoint"
        VerticalAlignment="Top"
        HorizontalAlignment="Left" />

    <Button
        Grid.Row="1"
        Command="{Binding Command}"
        Width="70" Height="30" Content="Press" />
</Grid>

将XpsDocument PowerPoint幻灯片放入WPF DocumentViewer

1 个答案: