Winforn中通過NPOI導出Excel時通過XSSFClientAnchor和XSSFPicture添加圖片

場景

Winform中通過NPOI導出Excel的三種方式(HSSFWorkbook，XSSFWorkbook，SXSSFWorkbook)附代碼下載：

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

在上面介紹了NPOI的三種導出Excel的方式後，如果想在導出的Excel中添加照片，該怎樣實現。

注：

博客主頁：
https://blog.csdn.net/badao_liumang_qizhi
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實現

通過上面的博客添加了NPOI的引用後，拖拽一個按鈕，在按鈕的點擊事件中

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

            #region 設置樣式

            ICellStyle style1 = wb.CreateCellStyle();//樣式
            IFont font1 = wb.CreateFont();//字體
            font1.FontName = "宋體";
            font1.FontHeightInPoints = 11;
            font1.Boldweight = (short)FontBoldWeight.Bold;
            style1.SetFont(font1);//樣式裏的字體設置具體的字體樣式


            #endregion

            #region 基礎信息頁sheet

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

            //獲取圖像
            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();
            // 插圖片的位置  HSSFClientAnchor（dx1,dy1,dx2,dy2,col1,row1,col2,row2)
            XSSFClientAnchor anchor = new XSSFClientAnchor(0, 0, 0, 0, 0, 3, 1, 4);
            //把圖片插到相應的位置
            XSSFPicture pict = (XSSFPicture)patriarch.CreatePicture(anchor, pictureIdx);

            //設置列寬度，根據公式：POI中的列寬 ≈ 像素/8*256
            decimal width = Math.Round((decimal)(heightPx) / 8, 2);
            //將圖片縮小爲原來的十分之九
            decimal lessWidth = Math.Round(width * 9 / 10, 2);
            sheet0.SetColumnWidth(0, Decimal.ToInt32(lessWidth * 256));
            IRow row3 = sheet0.CreateRow(3);
            //設置行高度，根據公式：POI中的行高 = 像素/DPI*72*20
            decimal poiHeight = Math.Round((decimal)(widthPx) / dpi, 2);
            //將圖片縮小爲原來的十分之九
            decimal lessPoiHeight = Math.Round(poiHeight * 9 / 10, 2);
            row3.Height = (short)Decimal.ToInt32(lessPoiHeight * 72 * 20);

            #endregion

            try
            {
                //將內存中的數據寫入磁盤
                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);
            }

        }

其中用到了將image轉爲byte數組的方法

        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()會改變MemoryStream的Position，需要重新Seek到Begin
                ms.Seek(0, SeekOrigin.Begin);
                ms.Read(buffer, 0, buffer.Length);
                return buffer;
            }
        }

用到的圖片的資源文件在Resouce中添加的

 

運行項目，然後點擊按鈕，就會在D盤下生成Excel