1. 本地路徑圖片

//填寫內容 
for (int i = 0; i < dt.Rows.Count; i++)
{  
    IRow row = sheet.CreateRow(i + 1 + 1);
    row.Height = 80 * 20; //設定excel行高，畫素點是1/20
    for (int j = 0; j < dt.Columns.Count; j++)
    {
        if (j == 4)
        {
            var dPath = AppDomain.CurrentDomain.BaseDirectory + dt.Rows[i][j].ToString().Replace(@"
 
/", @"\");
            if (File.Exists(dPath)) //防止檔案不存在時報錯
            {
                byte[] picBytes = System.IO.File.ReadAllBytes(dPath);
                int picIndex = workbook.AddPicture(picBytes, NPOI.SS.UserModel.PictureType.JPEG);
                XSSFDrawing patr = (XSSFDrawing)sheet.CreateDrawingPatriarch();
                XSSFClientAnchor anchor 
 
= new XSSFClientAnchor(0, 0, 0, 0, j, i + 2, j + 1, i + 3);
                XSSFPicture picture = (XSSFPicture)patr.CreatePicture(anchor, picIndex);
            }
        }
        else
        {
            row.CreateCell(j, CellType.String).SetCellValue(dt.Rows[i][j].ToString());
        }
    }
}

2. 網路路徑圖片

/// <summary>
/// 向sheet插入圖片
/// </summary> 
private static void AddCellPicture(ISheet sheet, XSSFWorkbook workbook, string imgPath, int row, int col)
{
    Uri uri = new Uri(imgPath); //imgPath :網路圖片地址    
    WebRequest webRequest = WebRequest.Create(uri);

    using (WebResponse webResponse = webRequest.GetResponse())
    {
        //防止發生報錯：GDI+中發生一般性錯誤的解決辦法
        Bitmap bitmap = new Bitmap(webResponse.GetResponseStream()); //讀取圖片流 
        Bitmap OldImage = new Bitmap(bitmap);//將圖片流複製到新的圖片流中 
        bitmap.Dispose();   //將原來的圖片流釋放，將圖片檔案進行解鎖。 

        using (MemoryStream ms = new MemoryStream())
        {
            OldImage.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
            byte[] bytes = ms.ToArray();
            int pictureIdx = workbook.AddPicture(bytes, NPOI.SS.UserModel.PictureType.JPEG);  //新增圖片 
            XSSFDrawing patriarch = (XSSFDrawing)sheet.CreateDrawingPatriarch();
            XSSFClientAnchor anchor = new XSSFClientAnchor(0, 0, 0, 0, col, row + 2, col + 1, row + 3);
            //圖片位置，圖片左上角為（col, row） 
            XSSFPicture pict = (XSSFPicture)patriarch.CreatePicture(anchor, pictureIdx);
            //pict.Resize(); //用圖片原始大小來顯示   
        } 
    }
}