Hi.
Firstly, I post the following codes what I wrote.
private void ExportDataIntoExcel(string exportedExcelFileName)
{
DataTable data = new DataTable();
GetDataTableForExportingIntoExcelFile(data);
Microsoft.Office.Interop.Excel.Application thisExcelApplication = null;
Microsoft.Office.Interop.Excel.Workbook thisWorkBook = null;
string imageFileTempPath = @"~\pages\cmsPatent\ExportImageTemp";
try
{
thisExcelApplication = new Microsoft.Office.Interop.Excel.ApplicationClass();
thisWorkBook = thisExcelApplication.Application.Workbooks.Add(Type.Missing);
Microsoft.Office.Interop.Excel.Worksheet thisWorksheet = (Microsoft.Office.Interop.Excel.Worksheet)thisWorkBook.Worksheets[1];
for (int i = 0; i < data.Rows.Count; ++i)
{
for (int j = 0; j < data.Columns.Count; ++j)
{
if (i == 0)
{
((Microsoft.Office.Interop.Excel.Range)thisWorksheet.Cells[1, j + 1]).Value2 = data.Columns[j].ColumnName;
}
if (string.Compare(data.Columns[j].ColumnName, "Image", false) != 0)
{
Microsoft.Office.Interop.Excel.Range range = (Microsoft.Office.Interop.Excel.Range)thisWorksheet.Cells[i + 2, j + 1];
range.Value2 = data.Rows[i][j];
range.WrapText = true;
range.ColumnWidth = 13;
continue;
}
// if (string.Compare(data.Columns[j].ColumnName, "Image", false) == 0):
if (DBNull.Value.Equals(data.Rows[i][j]))
{
((Microsoft.Office.Interop.Excel.Range)thisWorksheet.Cells[i + 2, j + 1]).Value2 = string.Empty;
continue;
}
string virtualImageFileTempPath = HttpContext.Current.Server.MapPath(imageFileTempPath);
if (!Directory.Exists(virtualImageFileTempPath))
{
Directory.CreateDirectory(virtualImageFileTempPath);
}
Random random = new Random();
virtualImageFileTempPath += @"\tmp" + random.Next() + "_" + DateTime.Now.ToString("MMddyyyyHHmmss") + ".gif";
#region Create the temporary file tmp***.gif, which will be insert into an Excel cell.
using (FileStream fs = new FileStream(virtualImageFileTempPath, FileMode.Create, FileAccess.ReadWrite))
{
byte[] firstPageImageData = null;
firstPageImageData = (byte[])data.Rows[i][j];
int firstPageImageDataSize = new int();
firstPageImageDataSize = firstPageImageData.GetUpperBound(0);
// This will create the temporary file tmp***.gif, which will be insert into an Excel cell.
fs.Write(firstPageImageData, 0, firstPageImageDataSize + 1); // had to add 1 here for this to work
//fs.Close();
//fs.Dispose();
}
#endregion
#region Insert the temporary tmp***.gif file into an Excel cell.
// Assign the temporary tmp***.gif file to be inserted into an Excel cell.
using (Bitmap imgBitmap = new Bitmap(virtualImageFileTempPath))
{
if (imgBitmap == null || imgBitmap.Width < 1 || imgBitmap.Height < 1)
{
((Microsoft.Office.Interop.Excel.Range)thisWorksheet.Cells[i + 2, j + 1]).Value2 = string.Empty;
continue;
}
Microsoft.Office.Interop.Excel.Range oRange = (Microsoft.Office.Interop.Excel.Range)thisWorksheet.Cells[i + 2, j + 1];
float Left = (float)((double)oRange.Left + 3);
float Top = (float)((double)oRange.Top + 3);
thisWorksheet.Shapes.AddPicture(virtualImageFileTempPath, Microsoft.Office.Core.MsoTriState.msoFalse, Microsoft.Office.Core.MsoTriState.msoCTrue, Left, Top, (float)imgBitmap.Width, (float)imgBitmap.Height);
if ((imgBitmap.Width + 5) > 255)
{
oRange.ColumnWidth = 59;
}
else
{
oRange.ColumnWidth = imgBitmap.Width + 5;
}
if ((imgBitmap.Height + 5) > 409)
{
oRange.RowHeight = 409;
}
else
{
oRange.RowHeight = imgBitmap.Height + 5;
}
//imgBitmap.Dispose();
}
#endregion
if (File.Exists(virtualImageFileTempPath))
{
File.Delete(virtualImageFileTempPath);
}
}
}
string excelFullName = imageFileTempPath + @"\" + exportedExcelFileName + ".xls";
thisWorkBook.SaveCopyAs(excelFullName);
thisWorkBook.Saved = true;
/*
thisWorkBook.Close(false, null, null);
thisExcelApplication.Quit();
thisWorkBook = null;
thisExcelApplication = null;
GC.Collect();
*/
thisWorkBook.Close(true, excelFullName, false);
if (thisExcelApplication != null)
{
thisExcelApplication.Quit();
System.Runtime.InteropServices.Marshal.ReleaseComObject(thisExcelApplication);
thisExcelApplication = null;
}
GC.Collect();
if (!File.Exists(excelFullName))
{
throw new Exception();
}
#region Export records in this DataTable into an Excel file.
HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=" + exportedExcelFileName + ".xls");
//HttpContext.Current.Response.ContentType = "application/vnd.ms-excel";
HttpContext.Current.Response.ContentType = "application/x-msexcel";
HttpContext.Current.Response.Charset = "";
HttpContext.Current.Response.WriteFile(excelFullName);
HttpContext.Current.Response.Flush();
HttpContext.Current.Response.End();
#endregion
File.Delete(excelFullName);
}
catch (Exception excelException)
{
}
finally
{
/*
if (thisWorkBook != null)
{
thisWorkBook.Close(false, null, null);
}
*/
if (thisExcelApplication != null)
{
thisExcelApplication.Quit();
System.Runtime.InteropServices.Marshal.ReleaseComObject(thisExcelApplication);
thisWorkBook = null;
thisExcelApplication = null;
}
GC.Collect();
if (!string.IsNullOrEmpty(imageFileTempPath) && Directory.Exists(imageFileTempPath))
{
var files = Directory.EnumerateFiles(imageFileTempPath, "*.*");
if (files != null)
{
foreach (string currentFile in files)
{
File.Delete(currentFile);
}
}
Directory.Delete(imageFileTempPath);
}
}
}
private void GetDataTableForExportingIntoExcelFile(DataTable data)
{
data.Columns.Add(new DataColumn("RowNumber", typeof(int)));
data.Columns.Add(new DataColumn("Image", typeof(byte[])));
for (int i = 1; i <= 5000; ++i)
{
DataRow dr = new DataRow();
dr["RowNumber"] = i;
dr["Image"] = ConvertImageUrlIntoImageByteData(@"~\images\" + i + ".gif");
data.Rows.Add(dr);
}
}
private byte[] ConvertImageUrlIntoImageByteData(string imageUrl)
{
byte[] imageByteData = null;
try
{
System.Net.WebRequest request = System.Net.WebRequest.Create(imageUrl);
System.Net.WebResponse responseWeb = request.GetResponse();
Stream responseStream = responseWeb.GetResponseStream();
var imgBitmap = new Bitmap(responseStream);
responseStream.Close();
if (imgBitmap == null || imgBitmap.Width < 1 || imgBitmap.Height < 1)
{
return null;
}
ImageConverter converter = new ImageConverter();
imageByteData = (byte[])converter.ConvertTo(imgBitmap, typeof(byte[]));
if (imageByteData == null || imageByteData.Length < 1)
{
return null;
}
}
catch (Exception e)
{
return null;
}
return imageByteData;
}I have 2 questions.
1. Although the method "ExportDataIntoExcel" located in the above codes can make me export data into an Excel file successfully, I do not want to create any tempopary gif file in the server before inserting a Bitmap object into an Excel cell. I have
that idea because I think less writing to the server is better. So How can I insert a Bitmap object into an Excel cell without creating any temporary gif file in the server?
I guess the following codes need to be modified for solving this question, so if you do not want to read the above long codes, please consentrating on the following codes.
#region Create the temporary file tmp***.gif, which will be insert into an Excel cell.
using (FileStream fs = new FileStream(virtualImageFileTempPath, FileMode.Create, FileAccess.ReadWrite))
{
byte[] firstPageImageData = null;
firstPageImageData = (byte[])data.Rows[i][j];
int firstPageImageDataSize = new int();
firstPageImageDataSize = firstPageImageData.GetUpperBound(0);
// This will create the temporary file tmp***.gif, which will be insert into an Excel cell.
fs.Write(firstPageImageData, 0, firstPageImageDataSize + 1); // had to add 1 here for this to work
//fs.Close();
//fs.Dispose();
}
#endregion
#region Insert the temporary tmp***.gif file into an Excel cell.
// Assign the temporary tmp***.gif file to be inserted into an Excel cell.
using (Bitmap imgBitmap = new Bitmap(virtualImageFileTempPath))
{
if (imgBitmap == null || imgBitmap.Width < 1 || imgBitmap.Height < 1)
{
((Microsoft.Office.Interop.Excel.Range)thisWorksheet.Cells[i + 2, j + 1]).Value2 = string.Empty;
continue;
}
Microsoft.Office.Interop.Excel.Range oRange = (Microsoft.Office.Interop.Excel.Range)thisWorksheet.Cells[i + 2, j + 1];
float Left = (float)((double)oRange.Left + 3);
float Top = (float)((double)oRange.Top + 3);
thisWorksheet.Shapes.AddPicture(virtualImageFileTempPath, Microsoft.Office.Core.MsoTriState.msoFalse, Microsoft.Office.Core.MsoTriState.msoCTrue, Left, Top, (float)imgBitmap.Width, (float)imgBitmap.Height);
if ((imgBitmap.Width + 5) > 255)
{
oRange.ColumnWidth = 59;
}
else
{
oRange.ColumnWidth = imgBitmap.Width + 5;
}
if ((imgBitmap.Height + 5) > 409)
{
oRange.RowHeight = 409;
}
else
{
oRange.RowHeight = imgBitmap.Height + 5;
}
//imgBitmap.Dispose();
}
#endregion2. How can I store the Excel file using Response stream instead of FileStream?
Thank you in advance.