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示例代码：

ExcelApplication xla = new ExcelApplication();
Workbook wb = xla.Create();
Worksheet ws = wb.Worksheets[0];
Shapes shps = ws.Shapes;
Anchor anch = ws.CreateAnchor(0, 7, 0, 0);
Shape shpHeart = shps.CreateShape(ShapeType.TextBox, anch);
shpHeart.FillTransparency=0.5;
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1 回答 1

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如您所知，Excel 没有水印的概念。将形状或图像添加到工作表的问题在于它会浮在单元格上。如果您希望单元格后面出现某些内容，最好的方法是在页眉或页脚中放置一个大图像，如本 MS 文章中所述：http: //office.microsoft.com/en-us/excel-help/模仿-a-watermark-in-excel-HP010103239.aspx

要使用 ExcelWriter API 以编程方式执行此操作，您可以使用HeaderFooterSection 对象的SetContent 方法。您还可以使用HeaderFooterPicture 对象调整图像的尺寸。

例子： 

ExcelApplication xla = new ExcelApplication();
Workbook wb = xla.Create(ExcelApplication.FileFormat.Xlsx);
Worksheet sheet1 = wb.Worksheets[0];
PageSetup pgsetup = sheet1.PageSetup;
HeaderFooterSection centerFooter = pgsetup.GetFooter(HeaderFooterSection.Section.Center);
string watermarkImagePath = @"C:\images\watermark.jpg";
using (FileStream fs = File.Open(watermarkImagePath, FileMode.Open, FileAccess.Read, FileShare.Read))
    {    
        //Note: Excel requires including the "&G" code when inserting 
        //an image in a header or footer
        centerFooter.SetContent("&G",fs);
    }
xla.Save(wb, Page.Response, "watermarktest.xlsx", false);

有关格式化页眉和页脚的更多信息：http ://wiki.softartisans.com/display/EW8/Formatting+Headers+and+Footers

于 2014-02-04T18:37:54.090 回答