怎么在EXECL文件中同时导入数据和插入图片？

/// <summary>/// /// </summary>/// <param name="dt">数据源</param>/// <param name="filepath">文件路劲例如（E:\\Execl\\201706070001.xls）</param>protected void ExportExcel(DataTable dt, string filepath)          {if (dt == null || dt.Rows.Count == 0) return;                Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();object m_objOpt = System.Reflection.Missing.Value;if (xlApp == null)              {return;              }//System.Globalization.CultureInfo CurrentCI = System.Threading.Thread.CurrentThread.CurrentCulture;System.Threading.Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo("en-US");                Microsoft.Office.Interop.Excel.Workbooks workbooks = xlApp.Workbooks;                Microsoft.Office.Interop.Excel.Workbook workbook = workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);                Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[1];                Microsoft.Office.Interop.Excel.Range range;long totalCount = dt.Rows.Count;long rowRead = 0;for (int i = 0; i < dt.Columns.Count; i++)                {                    worksheet.Cells[1, i + 1] = dt.Columns[i].ColumnName;                    range = (Microsoft.Office.Interop.Excel.Range)worksheet.Cells[1, i + 1];                    range.Interior.ColorIndex = 15;                }for (int r = 0; r < dt.Rows.Count; r++)              {for (int i = 0; i < dt.Columns.Count; i++)                  {try{if (i == 4)                          {                              range = worksheet.get_Range("E" + (r + 2), m_objOpt); //这里是因为我要给文档的E列插入图片，所以加了判断，并写死了E列                              range.Select();float PicLeft, PicTop;                              PicLeft = Convert.ToSingle(range.Left);                              PicTop = Convert.ToSingle(range.Top);                                range.ColumnWidth = 60;//设置单元格的宽                              range.RowHeight = 120;//设置单元格的高worksheet.Shapes.AddPicture(dt.Rows[r][i].ToString(), Microsoft.Office.Core.MsoTriState.msoFalse, Microsoft.Office.Core.MsoTriState.msoCTrue, PicLeft, PicTop, 100, 100);//这后面的100 是设置图片的宽高                          }elseworksheet.Cells[r + 2, i + 1] = dt.Rows[r][i].ToString();                      }catch{                          worksheet.Cells[r + 2, i + 1] = dt.Rows[r][i].ToString().Replace("=", "");                      }                  }                  rowRead++;              }                  xlApp.Visible = true;                workbook.Saved = true;                workbook.SaveAs(filepath);                  workbook.Close(true, Type.Missing, Type.Missing);                workbook = null;                xlApp.Quit();                xlApp = null;          }