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的方式后,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的引用后,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);//樣式里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); //將圖片縮小為原來的十分之九 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); //將圖片縮小為原來的十分之九 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轉為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,然后點擊按鈕,就會在D盤下生成Excel