EPPlus批量插入圖片到Excel

#region 測試EPPlus插入圖片
        public static void Createsheel2()
        {          
            WebClient client = new WebClient();
            var downloadUrl = FileOperater.GetDownloadUrl("f736cf1950e64400b3ba69001b0b5a1b");
            var excelData = client.DownloadData(downloadUrl);
            var bytes = client.DownloadData("http://img1.soufunimg.com/message/images/card/tuanproj/201511/2015112703584458_s.jpg");
           
            using (Stream ms = new MemoryStream(excelData))
            {
                ExcelPackage excel;
                try
                {   
                    excel = new ExcelPackage(ms);
                    ExcelWorksheet ws = excel.Workbook.Worksheets[1];
                    ExcelWorkbook wb = excel.Workbook;
                    for (int i = 1; i < 7; i++)
                    {
                        excel.Workbook.Worksheets.Copy(ws.Name, ws.Name+"_"+i);//複製模板sheet
                        var drawings = excel.Workbook.Worksheets[i].Drawings;
                        foreach (ExcelDrawing excelDrawing in drawings)
                        {
                            ExcelPicture excelPicture = excelDrawing as ExcelPicture;
                            var name = excelPicture.Name;
                            //var aa = excelPicture.Image;
                            //var cc = excelPicture.ImageFormat;
                            //excelPicture.Image.Save(imgms, System.Drawing.Imaging.ImageFormat.Jpeg);
                        }
                    }
                    int vSheetCount = excel.Workbook.Worksheets.Count; //獲取總Sheet頁    
                    for (int i = 1; i <= vSheetCount; i++)
                    {
                        ws = excel.Workbook.Worksheets[i];
                        using (Stream imgms = new MemoryStream(bytes))
                        {
                            System.Drawing.Bitmap myimge = new System.Drawing.Bitmap(imgms);
                            ExcelPicture picture = null;
                            for (int j = 0; j <4; j++)
                            {
                                picture = ws.Drawings.AddPicture("a" + j, myimge);//插入圖片
                                if (j >1)
                                {
                                    picture.SetPosition(560, 250 * (j - 2) + (j - 1) * 40);//設置圖片的位置
                                }
                                else
                                {
                                    picture.SetPosition(330, 250 * j +(j+1)*40);//設置圖片的位置
                                }
                                // picture.SetPosition(100*j, 100*j);//設置圖片的位置                            
                                picture.SetSize(250, 220);//設置圖片的大小
                            }
                        }
                    }
                    FileOperater.FileUpdate("f736cf1950e64400b3ba69001b0b5a1b", excel.GetAsByteArray());
                }
                catch (Exception ex)
                {
                    throw;
                }
            }             
        }
        #endregion