使用Aspose组件导出
Aspose有Aspose.Slides.dll，可以无需安装office，进行读写PPT文件。
Aspose可能通过Aspose.Slides.NET安装
简单的导出图片demo，如下：
1 internal class PptToImagesConverter
2 {
3 private const string ImageExtension = ".png";
4 public bool ConvertToImages(string pptFile, string exportImagesFolder)
5 {
6 using (Presentation pres = new Presentation(pptFile))
7 {
8 int desiredX = 1200;
9 int desiredY = 800;
10
11 float scaleX = (float)(1.0 / pres.SlideSize.Size.Width) * desiredX;
12 float scaleY = (float)(1.0 / pres.SlideSize.Size.Height) * desiredY;
13
14 foreach (ISlide sld in pres.Slides)
15 {
16 Bitmap bmp = sld.GetThumbnail(scaleX, scaleY);
17
18 string slidePath = Path.Combine(exportImagesFolder,$"Slide_{sld.SlideNumber}.{ImageExtension}");
19 bmp.Save(slidePath, System.Drawing.Imaging.ImageFormat.Png);
20 }
21 }
22
23 return true;
24 }
25
注：以上途径是没有购买过的dll，生成的图片会有水印。使用正版购买的，应该不会有问题。
使用Interop.PowerPoint导出
也是在Nuget中搜索并安装：
另，通过Presentations.Open("c:\test.pptx::PASSWORD::")可以解密PPT，从而导出图片。
1 internal class PptToImagesConverter1
2 {
3 private const string PASSWORD_MARK = "::PASSWORD::";
4 private const string ImageExtension = ".png";
5 public bool ConvertToImages(string pptFile, string exportImagesFolder)
6 {
7 var tempPpt = Path.Combine(Path.GetTempPath(), Guid.NewGuid() + Path.GetExtension(pptFile));
8 File.Copy(pptFile, tempPpt);
9 Microsoft.Office.Interop.PowerPoint.Application app = new Microsoft.Office.Interop.PowerPoint.Application();
10 Microsoft.Office.Interop.PowerPoint.Presentation presentation = app.Presentations.Open(tempPpt + PASSWORD_MARK, MsoTriState.msoTrue, MsoTriState.msoFalse, MsoTriState.msoFalse);
11 int desiredX = 1200;
12 int desiredY = 800;
13 var slides = ((Microsoft.Office.Interop.PowerPoint.Presentation)presentation).Slides.Cast<Microsoft.Office.Interop.PowerPoint.Slide>().ToList();
14 Parallel.ForEach(slides, slide =>
15 {
16 string slidePath = Path.Combine(exportImagesFolder, "Slide-" + slide.SlideIndex + ImageExtension);
17 slide.Export(slidePath, ImageExtension, desiredX, desiredY);
18 });
19 return true;
20 }
21
作者：唐宋元明清2188
