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//初始化Presentation实例
Presentation presentation = new Presentation();
//加载一个PowerPoint文档
presentation.LoadFromFile("test.pptx");
//遍历PowerPoint文档中的幻灯片并保存为PNG图片
for (int i = 0; i < presentation.Slides.Count; i++)
{
Image image = presentation.Slides[i].SaveAsImage();
String fileName = String.Format("图{0}.png", i);
image.Save(fileName, System.Drawing.Imaging.ImageFormat.Png);
}