C#怎么给word文档添加水印

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引用个spire.doc.dll，用下面这段代码加图片水印：using Spire.Doc;using System.Drawing;namespace Image_Watermark{ class Program { static void MAIn(string args) { //加载word文档 Document document = new Document(); document.LoadFromFile(Test.docx); //新建图片水印对象，加载要当水印的图片 PictureWatermark picture = new PictureWatermark(); picture.Picture = Image.FromFile(logo.png); //设置图片大小 picture.Scaling = 10; //把图片设成文档水印 document.Watermark = picture; } }}