Winforn中通过NPOI导出Excel时通过XSSFClientAnchor和XSSFPicture添加图片

场景

Winform中通过NPOI导出Excel的三种方式(HSSFWorkbook,XSSFWorkbook,SXSSFWorkbook)附代码下载:

https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/106423452

在上面介绍了NPOI的三种导出Excel的方式后,如果想在导出的Excel中添加照片,该怎样实现。

注:

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实现

通过上面的博客添加了NPOI的引用后,拖拽一个按钮,在按钮的点击事件中

private void button1_Click(object sender, EventArgs e)
        {
            //新建XSSFWorkbook对象
            XSSFWorkbook wb = new XSSFWorkbook();

            #region 设置样式

            ICellStyle style1 = wb.CreateCellStyle();//样式
            IFont font1 = wb.CreateFont();//字体
            font1.FontName = "宋体";
            font1.FontHeightInPoints = 11;
            font1.Boldweight = (short)FontBoldWeight.Bold;
            style1.SetFont(font1);//样式里的字体设置具体的字体样式


            #endregion

            #region 基础信息页sheet

            ISheet sheet0 = wb.CreateSheet("图形");

            //获取图像
            System.Drawing.Image image = Properties.Resources.badao;
            Byte[] bytes = ImageToBytes(image);
            int widthPx = image.Width;
            int heightPx = image.Height;
            int pictureIdx = wb.AddPicture(bytes, PictureType.JPEG);
            XSSFDrawing patriarch = (XSSFDrawing)sheet0.CreateDrawingPatriarch();
            // 插图片的位置  HSSFClientAnchor(dx1,dy1,dx2,dy2,col1,row1,col2,row2)
            XSSFClientAnchor anchor = new XSSFClientAnchor(0, 0, 0, 0, 0, 3, 1, 4);
            //把图片插到相应的位置
            XSSFPicture pict = (XSSFPicture)patriarch.CreatePicture(anchor, pictureIdx);

            //设置列宽度,根据公式:POI中的列宽 ≈ 像素/8*256
            decimal width = Math.Round((decimal)(heightPx) / 8, 2);
            //将图片缩小为原来的十分之九
            decimal lessWidth = Math.Round(width * 9 / 10, 2);
            sheet0.SetColumnWidth(0, Decimal.ToInt32(lessWidth * 256));
            IRow row3 = sheet0.CreateRow(3);
            //设置行高度,根据公式:POI中的行高 = 像素/DPI*72*20
            decimal poiHeight = Math.Round((decimal)(widthPx) / dpi, 2);
            //将图片缩小为原来的十分之九
            decimal lessPoiHeight = Math.Round(poiHeight * 9 / 10, 2);
            row3.Height = (short)Decimal.ToInt32(lessPoiHeight * 72 * 20);

            #endregion

            try
            {
                //将内存中的数据写入磁盘
                using (FileStream filestream = new FileStream(System.IO.Path.Combine(@"D:", "badao.xlsx"), FileMode.Create))
                {
                    wb.Write(filestream);
                    filestream.Close();
                }
            }
            catch (Exception ex)
            {
                Console.Write(ex);
            }

        }

其中用到了将image转为byte数组的方法

        public byte[] ImageToBytes(Image image)
        {
            ImageFormat format = image.RawFormat;
            using (MemoryStream ms = new MemoryStream())
            {
                image.Save(ms, ImageFormat.Bmp);
                byte[] buffer = new byte[ms.Length];
                //Image.Save()会改变MemoryStream的Position,需要重新Seek到Begin
                ms.Seek(0, SeekOrigin.Begin);
                ms.Read(buffer, 0, buffer.Length);
                return buffer;
            }
        }

用到的图片的资源文件在Resouce中添加的

运行项目,然后点击按钮,就会在D盘下生成Excel

原文地址:https://www.cnblogs.com/badaoliumangqizhi/p/12987059.html