Question

下载时需要在Excel文件的顶部添加徽标。

Response.Clear();
Response.Buffer = true;
Response.Charset = "";
Response.ClearContent();
Response.ClearHeaders();
string FileName = "MachinePlanning" + DateTime.Now + ".xls";
StringWriter strwritter = new StringWriter();
HtmlTextWriter htmltextwrtter = new HtmlTextWriter(strwritter);
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.ContentType = "application/vnd.ms-excel";
Response.AddHeader("Content-Disposition", "attachment;filename=" + FileName);
GridView1.GridLines = GridLines.Both;
GridView1.HeaderStyle.Font.Bold = true;
GridView1.RenderControl(htmltextwrtter);
Response.Write(strwritter.ToString());
Response.End();

Answer 1

您需要通过Open XML或NPOI.Dll来完成。

下面的代码将导出excel与公司徽标。但是你需要添加NPOI.DLL。

  public static MemoryStream ExportToExcelWithCompanyLogo(DataTable dt, string sheetName, string CompanyLogo,Dictionary<string, string> filters)
  {

  //Create new Excel Workbook
  var workbook = new HSSFWorkbook();
  //Create new Excel Sheet
  var sheet = workbook.CreateSheet(sheetName);

  // Add Image Section 
  var patriarch = sheet.CreateDrawingPatriarch();
  HSSFClientAnchor anchor;
  anchor = new HSSFClientAnchor(0, 0, 0, 0, (short)1, 1, (short)5, 6);
  anchor.AnchorType = 2;

  string imagesPath = CompanyLogo;
  //grab the image file
  //imagesPath = System.IO.Path.Combine(imageLocation, "image.jpg");
  //create an image from the path
  System.Drawing.Image image = System.Drawing.Image.FromFile(imagesPath);

  MemoryStream ims = new MemoryStream();
  //pull the memory stream from the image (I need this for the byte array later)
  image.Save(ims, System.Drawing.Imaging.ImageFormat.Jpeg);


  int index = workbook.AddPicture(ims.ToArray(), PictureType.JPEG);

  var picture = patriarch.CreatePicture(anchor, index);
  picture.Resize(0.8);
  //picture.LineStyle = HSSFPicture.LINESTYLE_DASHDOTGEL;
  sheet.ForceFormulaRecalculation = true;

  // End of Add image

  // font Style for Excel title
  HSSFFont hFont = (HSSFFont)workbook.CreateFont();
  hFont.FontHeightInPoints = 16;
  hFont.FontName = "Calibri";
  hFont.Boldweight = (short)NPOI.SS.UserModel.FontBoldWeight.Bold;

  HSSFCellStyle hStyle = (HSSFCellStyle)workbook.CreateCellStyle();
  hStyle.Alignment = HorizontalAlignment.Center;
  hStyle.VerticalAlignment = VerticalAlignment.Top;
  hStyle.SetFont(hFont);
  // end of excel title style

  // font for Table header Stylr
  HSSFFont thhFont = (HSSFFont)workbook.CreateFont();
  thhFont.FontHeightInPoints = 12;
  thhFont.FontName = "Calibri";
  thhFont.Boldweight = (short)NPOI.SS.UserModel.FontBoldWeight.Bold;

  HSSFCellStyle thhStyle = (HSSFCellStyle)workbook.CreateCellStyle();
  thhStyle.Alignment = HorizontalAlignment.Left;
  thhStyle.VerticalAlignment = VerticalAlignment.Top;
  thhStyle.SetFont(thhFont);
  // end of table header font



  var cra = new NPOI.SS.Util.CellRangeAddress(6, 7, 4, 9);
  sheet.AddMergedRegion(cra);

  // Add filters to sheet
  int filterRows = 9;
  foreach (var key in filters)
  {
  var FilterRow = sheet.CreateRow(filterRows);
  FilterRow.CreateCell(4).SetCellValue(key.Key + " : ");
  FilterRow.CreateCell(5).SetCellValue(key.Value);
  filterRows++;
  }


  var HeaderRowNumber = 9 + filters.Keys.Count + 1;
  //Add rows
  var headerRow = sheet.CreateRow(HeaderRowNumber);
  //int totalcolumns = dt.Columns.Count;
  int columncounter = 0;

  if (dt.Rows.Count > 0)
  {
  foreach (DataColumn c in dt.Columns)
  {
  var cell = headerRow.CreateCell(columncounter + 1);
  cell.SetCellValue(c.ColumnName);
  cell.CellStyle = thhStyle;
  columncounter++;
  }
  //(Optional) freeze the header row so it is not scrolled
  //sheet.CreateFreezePane(0, 1, 0, 1);
  int rowNumber = HeaderRowNumber + 1;
  int dtrowNumber = 1;
  //Populate the sheet with values from the grid data
  foreach (var rows in dt.Rows)
  {
  //Create a new Row
  var row = sheet.CreateRow(rowNumber);
  //Set cell Value
  for (int cellnumber = 0; cellnumber < columncounter; cellnumber++)
  row.CreateCell(cellnumber + 1).SetCellValue(dt.Rows[dtrowNumber - 1][cellnumber].ToString());
  rowNumber++;
  dtrowNumber++;
  }
  // create 2 blank rows
  for (int i = 0; i < 2; i++)
  {
  //Create a new Row
  var row = sheet.CreateRow(rowNumber);
  //Set cell Value
  for (int cellnumber = 0; cellnumber < columncounter; cellnumber++)
  row.CreateCell(cellnumber + 1).SetCellValue("");
  rowNumber++;
  }

  // Add Date of extraction and source
  var extractedDate = sheet.CreateRow(rowNumber);
  var ecel = extractedDate.CreateCell(4);
  ecel.SetCellValue("Extracted Date : ");
  // ecel.CellStyle = hStyle;
  extractedDate.CreateCell(5).SetCellValue(DateTime.Now.ToString("dd - MMM - yyyy"));
  rowNumber++;



  var Disclaimer = sheet.CreateRow(rowNumber);
  var dcel = Disclaimer.CreateCell(4);
  dcel.SetCellValue("Disclaimer : ");
  // dcel.CellStyle = hStyle;
  Disclaimer.CreateCell(5).SetCellValue("All Rights Reserved.");
  rowNumber++;

  var Disclaimer1 = sheet.CreateRow(rowNumber);
  Disclaimer1.CreateCell(5).SetCellValue("Give some information at footer");
  rowNumber++;

  }
  else
  {
  for (int i = 0; i <= 10; i++)
  headerRow.CreateCell(i).SetCellValue("");
  }
  // End of add rows
  //Write the Workbook to a memory stream
  MemoryStream output = new MemoryStream();
  workbook.Write(output);
  return output;

  }

您可以从此链接下载NPOI.Dll Download NPOI.dll

希望这能解决您的问题。

在Excel的顶部添加公司徽标

1 个答案: