1

我有一个从 excel 文件中的工作表中读取数据的应用程序,并在同一文件的另一张工作表中打印出来。

为了我自己的满意,我想在显示输出的那张表上添加一个水印。我正在使用 C# 和 .NET

我需要粘贴任何特定代码吗?我不确定你需要什么。请询问您是否需要更多详细信息

用于处理 excel 对象的库 -:

using Microsoft.Office.Core;
using Excel = Microsoft.Office.Interop.Excel;

//creating an object of Application
Excel.Application excelApp = new Excel.Application();

//creating an object of Workbook
Excel.Workbook excelWorkbook = excelApp.Workbooks.Open(path, 0,false,
                            5, "", "", false, Excel.XlPlatform.xlWindows,
                            "", true, false, 0, true, false, false);

//creating an object of Sheet
Excel.Sheets excelSheets = (Excel.Sheets)excelWorkbook.Sheets;
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3 回答 3

0

If you're using Syncfusion XlsIO then this code is the one you have to use:

// Set the image as sheet background
sheet.PageSetup.BackgoundImage = new System.Drawing.Bitmap(@"image.png");
于 2013-09-06T11:48:58.093 回答
0

由于 Excel 支持打开 HTML,因此您可以生成使用 excel 打开的 Html 表格。这段 html 代码将背景图像或水印(虽然不是 html 标准)添加到您的 excel 生成文件中。您需要将图像文件与在 excel 中打开的 HTML 文件放在同一文件夹中。这适用于不使用任何 .NET Framework 生成 Excel 兼容文件的情况。

生成的_Excel.html:

<html>
<body background="1.png">
    <table>
        <tr>
            <td>Column1</td> 
            <td>Column2</td>
        </tr>
        <tr>
            <td>Value Column 1</td> 
            <td>Value Column 2</td>
        </tr>
    </table>
</body>

最后结果:

在此处输入图像描述

于 2013-09-06T11:45:16.377 回答
0

我一直在研究这个问题,因为我在发布我的工作代码的任何地方都没有找到解决方案。此解决方案通过创建临时图像并将其插入幻灯片来工作。创建代码的步骤基于此:http ://smallbusiness.chron.com/put-watermarks-photos-word-45076.html链接。

    public void AddWaterMarkToPowerPoint(string filePath)
    {
        string waterMarkText = "Top secret";

        PowerPoint.Application powerPointApp = new PowerPoint.Application();

        PowerPoint.Presentations pres = powerPointApp.Presentations;

        string imagePath = null;

        try
        {
            PowerPoint.Presentation pptPresentation = pres.Open(filePath, MsoTriState.msoTrue, MsoTriState.msoTrue, MsoTriState.msoFalse);

            PowerPoint.PageSetup pageSetup = pptPresentation.PageSetup;

            float pageWidth = pageSetup.SlideWidth;
            float pageHeight = pageSetup.SlideHeight;

            CreateTempWaterMarkImage(waterMarkText, ref imagePath, (int)pageHeight, (int)pageWidth);

            for (int i = 1; i <= pptPresentation.Slides.Count; i++)
            {
                PowerPoint.Slide slide = pptPresentation.Slides[i];

                PowerPoint.Shapes shapes = slide.Shapes;

                PowerPoint.Shape shape = shapes.AddShape(MsoAutoShapeType.msoShapeRectangle, 0, 0, pageWidth, pageHeight);

                shape.Fill.UserPicture(imagePath);

                shape.Fill.Transparency = 0.7f;

                shape.Line.Transparency = 1;

                shape.ZOrder(MsoZOrderCmd.msoBringToFront);
            }

            pptPresentation.SaveAs(filePath);

            pptPresentation.Close();
        }
        catch (Exception ex)
        {
            //log exception

            throw;
        }
        finally
        {
            // Cleanup
            GC.Collect();
            GC.WaitForPendingFinalizers();

            powerPointApp.Quit();

            //remove temp image
            if (imagePath != null)
                File.Delete(imagePath);
        }
    }

private void CreateTempWaterMarkImage(string waterMarkText, ref string imagePath, int pageHeight, int pageWidth)
{

    float angleRotation = (float)((Math.Atan2((double)pageHeight, (double)pageWidth) * 180) / Math.PI);

    float fontSize = (float)Math.Sqrt(Math.Pow(pageHeight, 2) + Math.Pow(pageWidth, 2)) / 50;

    using (Bitmap newie = new Bitmap(pageWidth, pageHeight))
    {
        using (Graphics gr = Graphics.FromImage(newie))
        {
            gr.SmoothingMode = SmoothingMode.AntiAlias;

            gr.TranslateTransform((float)pageWidth / 2f, (float)pageHeight / 2f);

            gr.RotateTransform(-angleRotation);

            Font font = new Font("Arial", fontSize, FontStyle.Regular);

            SizeF textSize = gr.MeasureString(companyName, font);

            gr.DrawString(waterMarkText, font, SystemBrushes.GrayText, -textSize.Width, -textSize.Height);
        }

        string fileName = Path.GetRandomFileName();

            imagePath = Path.GetTempPath() + @"\" + fileName + ".png";

            newie.Save(imagePath, ImageFormat.Png);
        }
    }
于 2014-12-22T09:45:53.160 回答