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为方便使用者快速掌握和了解Spire.Presentation，本文列举了PPT处理控件Spire.Presentation常见问题及解答，欢迎下载最新版体验！

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如何给PowerPoint文档添加密码保护?

请使用Encrypt方法给文档加密。全部代码：

Presentation presentation = new Presentation();
presentation.LoadFromFile("sample.pptx");
presentation.Encrypt("test");
presentation.SaveToFile("encrypt.pptx", FileFormat.Pptx2010);

如何转换PowerPoint文件到PDF?

只需要加载文件，然后保存成PDF即可。全部代码：

Presentation presentation = new Presentation();
//加载文件
presentation.LoadFromFile("ppt.ppt");
//把文件保存成PDF
presentation.SaveToFile("ToPdf.pdf", FileFormat.PDF);

如何将幻灯片保存成图片?

请使用SaveAsImage方法将幻灯片保存到Image中，然后将Image对象保存成图片。全部代码：

Presentation ppt = new Presentation();
ppt.LoadFromFile(@"F:\testing\Sample.pptx");
for (int i = 0; i < ppt.Slides.Count; i++)
{
  //将幻灯片保存到Image中
  Image image = ppt.Slides[i].SaveAsImage();
  String fileName = String.Format("5614-img-{0}.png", i);
  //将image保存成文件
  image.Save(fileName, System.Drawing.Imaging.ImageFormat.Png);
}

如何设置文本框中文本的对齐方式?

请使用Alignment设置文本的对齐方式。全部代码：

Presentation presentation = new Presentation();
//添加一个shape
IAutoShape shape = presentation.Slides[0].Shapes.AppendShape(ShapeType.Rectangle, new RectangleF(50, 70, 600, 400));
//设置shape里面第一段的对齐方式为左对齐
shape.TextFrame.Paragraphs[0].Alignment = TextAlignmentType.Left;
shape.Fill.FillType = FillFormatType.None;
//添加文本
shape.TextFrame.Text = "Demo about Alignment";
presentation.SaveToFile("alignment.pptx", FileFormat.Pptx2010);

如何提取PowerPoint中的文本?

请您使用TextParagraph的Text属性。全部代码：

StringBuilder sb = new StringBuilder();

for (int i = 0; i < ppt.Slides.Count;i++ )
       {
           for (int j = 0; j < ppt.Slides[i].Shapes.Count;j++ )
           {
               if (ppt.Slides[i].Shapes[j] is IAutoShape)
               {
                   IAutoShape shape=ppt.Slides[i].Shapes[j] as IAutoShape;
                   if (shape.TextFrame != null)
                   {
                       foreach (TextParagraph tp in shape.TextFrame.Paragraphs)
                       {
                           sb.Append(tp.Text + Environment.NewLine);
                       }
                   }

               }
           }
       }

如何用图片填充形状?

请使用PictureShape的Url属性。全部代码：

Presentation ppt = new Presentation();
IAutoShape shape = (IAutoShape)ppt.Slides[0].Shapes.AppendShape(ShapeType.DoubleWave, new RectangleF(100, 100, 400, 200));
string picUrl = @"C:\Users\Administrator\Desktop\image.jpg";
shape.Fill.FillType = FillFormatType.Picture;
shape.Fill.PictureFill.Picture.Url = picUrl;
shape.Fill.PictureFill.FillType = PictureFillType.Stretch;
shape.ShapeStyle.LineColor.Color = Color.Transparent;
ppt.SaveToFile("shape.pptx", FileFormat.Pptx2010);

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