I'm working on some code that generates an Excel spreadsheet server-side and then downloads it to the user. I'm using ExcelPackage to generate the file.
The generation is working just fine. I can open the generated files using Excel 2007 with no issues. But, I'm having trouble downloading the file with Response.TransmitFile().
Right now, I have the following code:
//Generate the file using ExcelPackage
string fileName = generateExcelFile(dataList, "MyReportData");
Response.AddHeader("content-disposition", "attachment;filename=FileName.xls");
Response.ContentType = "application/vnd.xls"
Response.Charset = "";
Response.TransmitFile(fileName);
When Excel 2007 opens the file downloaded as above, it gives the "file format doesn't match extension" warning. After clicking past the warning, Excel displays the raw xml contents of the file.
If I change the file extension, like so
Response.AddHeader("content-disposition", "attachment;filename=FileName.xlsx");
Excel 2007 gives an "Excel found unreadable content in the file" error, followed by a dialog that offers to locate a converter on the web. If I click "no" on this dialog, Excel is able to load the data.
I've also experimented with different MIME types, like application/vnd.ms-excel and application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, combined with file extensions of .xls and .xlsx. All combinations result in one of the two behaviors mentioned above.
What is the correct combination of file extension and MIME type to use in this scenario? What else could cause this failure, other than an improper MIME type or extension?
FYI, this is occurring with Visual Studio's built-in development web server. I haven't yet tried this with IIS.
I can't definitely say that there's anything wrong with your approach, but I'll just share some observations from doing something similar.
Headers are Pascal Case, most browsers shouldn't care but I would change your content-disposition to Content-Disposition. Changing the Charset shouldn't be necessary or relevant. Your content type should be fine, I would only use application/vnd.openxmlformats-officedocument.spreadsheetml.sheet and .xlsx if that is actually the content of the file, otherwise stick with application/vnd.ms-excel and .xls.
Another thing you should consider is sending the browser the Content-Length:
Response.AddHeader("Content-Length", new System.IO.FileInfo("FileName.xlsx").Length);
Also have you tried this with multiple browsers? Just wondering if it's a vendor-specific problem.
As a last ditch effort, you can set your Content-Type to application/octet-stream, and any browser should offer to download it, and then most browsers will let you open it after it's downloaded based on the extension.
use this
HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=\"filename + ".zip" + "\"");
Response.TransmitFile(zipPath);
Response.Flush();
Response.Close();
Response.End();
in your code is
Response.AddHeader("content-disposition", "attachment;filename=\FileName.xlsx\");
Try like this
public void DataTableToExcel(DataTable dt, string Filename)
{
MemoryStream ms = DataTableToExcelXlsx(dt, "Sheet1");
ms.WriteTo(HttpContext.Current.Response.OutputStream);
HttpContext.Current.Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=" + Filename);
HttpContext.Current.Response.StatusCode = 200;
HttpContext.Current.Response.End();
}
public static MemoryStream DataTableToExcelXlsx(DataTable table, string sheetName)
{
MemoryStream result = new MemoryStream();
ExcelPackage excelpack = new ExcelPackage();
ExcelWorksheet worksheet = excelpack.Workbook.Worksheets.Add(sheetName);
int col = 1;
int row = 1;
foreach (DataColumn column in table.Columns)
{
worksheet.Cells[row, col].Value = column.ColumnName.ToString();
col++;
}
col = 1;
row = 2;
foreach (DataRow rw in table.Rows)
{
foreach (DataColumn cl in table.Columns)
{
if (rw[cl.ColumnName] != DBNull.Value)
worksheet.Cells[row, col].Value = rw[cl.ColumnName].ToString();
col++;
}
row++;
col = 1;
}
excelpack.SaveAs(result);
return result;
}
Related
I created a code in c# which creates and saves excel file. The code can successfully create and save excel file, but when I open the excel file created, it displays a warning message telling:
The file format and extension of 'filename.xls' don't match. The file could be corrupted or unsafe. Unless you trust its source, don't open it. Do you want to open it anyway?
I am using the following code:
private void button1_Click(object sender, EventArgs e)
{
saveFileDialogSummary.Filter = "Excel Flie|*.xls";
saveFileDialogSummary.FilterIndex = 0;
saveFileDialogSummary.RestoreDirectory = true;
saveFileDialogSummary.CreatePrompt = true;
saveFileDialogSummary.Title = "Export Excel File To";
Excel.Application ExcelApp = new Excel.Application();
ExcelApp.Application.Workbooks.Add(Type.Missing);
ExcelApp.Columns.ColumnWidth = 30;
for (int i = 0; i < dataGridViewSummary.Rows.Count; i++)
{
DataGridViewRow row = dataGridViewSummary.Rows[i];
for (int j = 0; j < row.Cells.Count; j++)
{
ExcelApp.Cells[i + 1, j + 1] = row.Cells[j].ToString();
}
}
DialogResult res = saveFileDialogSummary.ShowDialog();
if(res == DialogResult.OK){
ExcelApp.ActiveWorkbook.SaveCopyAs(saveFileDialogSummary.FileName);
ExcelApp.ActiveWorkbook.Saved = true;
ExcelApp.Quit();
}
}
What should I do to avoid receiving that warning message?
I know this problem may be resolved by now, but just trying to help you without modifying the code can still use .xls format in your's and suppress this warning while opening the file by setting a registry.
Open reg edit, navigate to HKEY_CURRENT_USER\Software\Microsoft\Office\14\Excel\Security
Create a DWord with name ExtensionHardening and set the value to 0.
This might get your system vulnerable, but it is not a big deal when working in organisation network, at-least when you're sure of downloading the type of doc and source.
Just change the .xls to .xlsx if you have the latest office installed.
The file extension .xls and .xlsx file contain different-different layout. the extension .xls use in version 2003 whereas then version .xlsx extension to be used.
You must export excel file to .xlsx format. It will support in all version as i used.
Add below DLLS into bin folder
1. ClosedXML.dll
2. DocumentFormat.OpenXml.dll
Code to Export to .xlsx
DataTable dt = new DataTable();
//Create column and inser rows
using (XLWorkbook wb = new XLWorkbook())
{
var ws = wb.Worksheets.Add(dt, Sheetname);
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.Buffer = true;
HttpContext.Current.Response.Charset = "";
HttpContext.Current.Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
HttpContext.Current.Response.AddHeader("content-disposition", "attachment;filename=" + p_FileName + ".xlsx");
using (MemoryStream MyMemoryStream = new MemoryStream())
{
wb.SaveAs(MyMemoryStream);
MyMemoryStream.WriteTo(HttpContext.Current.Response.OutputStream);
HttpContext.Current.Response.Flush();
HttpContext.Current.Response.End();
}
}
The solution for "file format and extension don't match" is to close the work book**($workbook->close;)** at last after all necessary writings done on to the file.
I faced the same issue while opening the "XLS" file from mail. I created a file and inserted all my stuff init and without closing the workbook I send the mail as an attachment. Later I realized that have to close the workbook and send as an attachment.
I am exporting data into Excel from a web page. This should be a no brainer, but there are <p> tags in the data. This causes Excel to create new rows when the data should all be in the same cell. After some research I found that mso-data-placement should do the trick, but it's not working. Excel opens, the data is displayed, but extra uncessary rows are created. Here is the code I use to export the data:
protected void doexcel()
{
string style = #"<style type='text/css'>P {mso-data-placement:same-cell; font-weight:bold;}</style>";
HttpResponse response = HttpContext.Current.Response;
// first let's clean up the response.object
response.Clear();
response.Charset = "";
//set the response mime type for excel
response.ContentType = "application/vnd.ms-excel";
Random RandomClass = new Random();
int RandomNumber = RandomClass.Next();
String filename = "a" + RandomNumber + DateTime.Now + ".xls";
response.AddHeader("Content-Disposition", "attachment;filename=\"" + filename + "\"" );
// create a string writer
using (StringWriter sw = new StringWriter())
{
using (HtmlTextWriter htw = new HtmlTextWriter(sw))
{
HttpContext.Current.Response.Write(style);
SqlDataSourceEmployeeAssets.ConnectionString = MyObjects.Application.CurrentContext.ConnectionString;
String sql = (string)Session["sql"];
SqlDataSourceEmployeeAssets.SelectCommand = sql;
// lCount.Text = "Query returned " + getCount(query) + " rows.";
DataGrid dge = new DataGrid();
dge.DataSource = SqlDataSourceEmployeeAssets;
dge.DataBind();
dge.RenderControl(htw);
response.Write(sw.ToString());
response.End();
}
}
}
This is an example of the raw data in the database that is giving me grief:
<P>4/13/2011 : Cheng "Jonathan" Vaing is with BSES Graffiti Unit.</P><P>4/13/2011 : Cheng "Jonathan" Vaing is with</P>
Suggestions?
I tried a couple of other things
I went straight to the data and added the mso-data-placement attribute to the paragraph tag inline. Still didn't work. The data looked like this
<P style="mso-data-placement:same-cell> my data </p>
I tried other mso-* attributes, that didn't work either. For example, I changed my stylesheet to look like this
<style type='text/css'>P {mso-highlight:yellow}</style>";
Why oh why doesn't Excel recognize my mso-* attributes?!?!
There is a solution but it is not clean.
After the dge.DataBind, place the following code. This will encode the text of each cell
foreach (DataGridItem dgi in dge.Items)
{
foreach (TableCell cell in dgi.Cells)
{
cell.Text = WebUtility.HtmlEncode(cell.Text);;
}
}
The Excel file, when opened, should show the raw data with the markup, all in one cell.
I found that this works because Excel actually encodes the text, as well. To see what Excel does in action, do the following:
Create a new workbook in Excel (I am using Office 2013).
In the first cell, paste the raw data (as you have it displayed). Do this by first pressing F2 (insert into cell), then paste the text.
Save the workbook as an HTML file (or web page).
Using windows explorer, go to the folder location of where you saved the file. There should be a hidden folder (i think it is hidden) with the same name as your file. For example, if your workbook is Book1.htm, there should be a folder labeled Book1_files.
In this folder, there should be an HTM file with the name sheet001.htm. Open this file in notepad (or any text editor...not excel or word)
Locate your raw data. You will see that the text is not showing the HTML markup, rather it is showing the encoded version.
Hope this helps.
I have an DataTable I need to put into Excel 2007 format and save it as an excel file(.xlsx) 2007.
Can anyone help me to achieve this?
You can use an OLEDB data provider and just treat Excel as another ADO.NET data source in order to loop through your DataTable rows and insert them into the Excel spreadsheet. Here's a Microsoft KB article that walks you through a lot of the details.
http://support.microsoft.com/kb/316934/en-us
The big thing to keep in mind is that you can create workbooks and sheets within the workbook, and you can reference existing sheets by appending a '$' at the end of the name. If you omit the '$' at the end of the sheet name, the OLEDB provider will assume that it's a new sheet and will try to create it.
The dollar sign following the
worksheet name is an indication that
the table exists. If you are creating
a new table, as discussed in the
Create New Workbooks and Tables
section of this article, do not use
the dollar sign.
You can create and spreadsheet in 2003 (.xls) or 2007 format (xlsx), and that's defined on your connection string -- you specify the file that you're going to write to, and just specify the extension. Make sure you use the right OLEDB provider version.
If you want to create a 2003 (.xls) version, you use this connection string:
Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Book1.xls;Extended Properties="Excel 8.0;HDR=YES
If you want to create a 2007 (.xlsx) version, you use this connection string:
Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Book1.xlsx;Extended Properties="Excel 12.0;HDR=YES
You may have to download the ACE provider from Microsoft in order to create XLSX files. You can find it here.
I usually use the XLS provider, so I haven't worked with the XLSX provider as much.
Hope this helps. Let me know if you have other questions.
I wrote the following code for the company some time back. It takes Enumerable of any class type and exports all its (get)properties to Excel and also open Excel. You should be able to do something similar for a DataTable. Remember you need to add reference to Microsoft.Office.Interop.Excel
public static void ExportToExcel<T>(IEnumerable<T> exportData)
{
Excel.ApplicationClass excel = new Excel.ApplicationClass();
Excel.Workbook workbook = excel.Application.Workbooks.Add(true);
PropertyInfo[] pInfos = typeof(T).GetProperties();
if (pInfos != null && pInfos.Count() > 0)
{
int iCol = 0;
int iRow = 0;
foreach (PropertyInfo eachPInfo in pInfos.Where(W => W.CanRead == true))
{
// Add column headings...
iCol++;
excel.Cells[1, iCol] = eachPInfo.Name;
}
foreach (T item in exportData)
{
iRow++;
// add each row's cell data...
iCol = 0;
foreach (PropertyInfo eachPInfo in pInfos.Where(W => W.CanRead == true))
{
iCol++;
excel.Cells[iRow + 1, iCol] = eachPInfo.GetValue(item, null);
}
}
// Global missing reference for objects we are not defining...
object missing = System.Reflection.Missing.Value;
// If wanting to Save the workbook...
string filePath = System.IO.Path.GetTempPath() + DateTime.Now.Ticks.ToString() + ".xlsm";
workbook.SaveAs(filePath, Excel.XlFileFormat.xlOpenXMLWorkbookMacroEnabled, missing, missing, false, false, Excel.XlSaveAsAccessMode.xlNoChange, missing, missing, missing, missing, missing);
// If wanting to make Excel visible and activate the worksheet...
excel.Visible = true;
Excel.Worksheet worksheet = (Excel.Worksheet)excel.ActiveSheet;
excel.Rows.EntireRow.AutoFit();
excel.Columns.EntireColumn.AutoFit();
((Excel._Worksheet)worksheet).Activate();
}
}
I have an DataTable I need to put into Excel 2007 format and save it
as an excel file(.xlsx) 2007.
Can anyone help me to achieve this?
You just need to add my free C# class to your project, and one line of code.
Full details (with free downloadable source code, and an example project) here:
Mikes Knowledge Base - Export to Excel
My library uses the free Microsoft OpenXML libraries (also provided in my downloads) to write the file, so you don't have to use the heavyweight VSTO libraries, or have Excel installed on your server.
Also, it creates a real .xlsx file, rather than some other methods which write a stream of data to a comma-separated text file, but name it as a .xls file.
By the way, I had loads of difficulties writing to Excel files using OLEDB, not least because I was running Windows 7 64-bit, with Office 2007 (which is 32-bit) and the Microsoft ACE provider has to be the 64-bit edition... but you can't install this, if you have the 32-bit version of Office installed.
So, you have to uninstall Office, install the ACE driver, and then re-install Office.
But even then, I gave up using OLEDB.. it just wasn't stable enough.
Found this in some old code I did like 5 years ago that should work...
public static void DataTableToExcel(DataTable tbl)
{
HttpContext context = HttpContext.Current;
context.Response.Clear();
foreach (DataColumn c in tbl.Columns)
{
context.Response.Write(c.ColumnName + ";");
}
context.Response.Write(Environment.NewLine);
foreach (DataRow r in tbl.Rows)
{
for (int i = 0; i < tbl.Columns.Count; i++)
{
context.Response.Write(r[i].ToString().Replace(";", string.Empty) + ";");
}
context.Response.Write(Environment.NewLine);
}
context.Response.ContentType = "text/csv";
context.Response.AppendHeader("Content-Disposition",
"attachment; filename=export.csv");
context.Response.End();
}
This will output from ASP.NET a response with a CSV file that Excel 2007 can open. If you want you can change the extension to mimic excel and it should work just by replacing the following lines:
context.Response.ContentType = "application/vnd.ms-excel";
context.Response.AppendHeader("Content-Disposition",
"attachment; filename=export.xlsx");
A CSV is the easiest way if you don't need to do anything complex. If you do require it to truly be a Excel 2007 file in the native format, you will need to use an Office library to build it or convert it from the CSV and then serve/save it.
This link might also be useful:
How to avoid the Excel prompt window when exporting data to Excel 2007
Saw that someone else posted a "save to csv" option. While that didn't seem to be the answer the OP was looking for, here is my version that includes the table's headers
public static String ToCsv(DataTable dt, bool addHeaders)
{
var sb = new StringBuilder();
//Add Header Header
if (addHeaders)
{
for (var x = 0; x < dt.Columns.Count; x++)
{
if (x != 0) sb.Append(",");
sb.Append(dt.Columns[x].ColumnName);
}
sb.AppendLine();
}
//Add Rows
foreach (DataRow row in dt.Rows)
{
for (var x = 0; x < dt.Columns.Count; x++)
{
if (x != 0) sb.Append(",");
sb.Append(row[dt.Columns[x]]);
}
sb.AppendLine();
}
return sb.ToString();
}
We generate an Excel spreadsheet in our C# .net website by writing out an HTML table to Response. This works great, but the sheet name gets set to the same as the file name.
Is there away to set this? We require a certain sheet name when importing.
Code:
string filename = String.Format( "{0}-CopyDataBack_{1}.xls", Master.EventID.ToString(), DateTime.Now.ToString( "dd-MM-yy_HHmm" ) );
Response.Clear();
Response.Buffer = true;
Response.ContentType = "application/vnd.ms-excel";
Response.AddHeader("content-disposition", "attachment;filename=" + filename );
Response.Charset = "";
this.EnableViewState = false;
System.Text.StringBuilder tableOut = new System.Text.StringBuilder();
// ... Create an HTML table in a StringBuilder ...
Response.Write( tableOut );
Response.End();
By creating a table and setting content-type to Excel you can't define a worksheet name, nor to create more worksheets.
You can to generate your complete Excel workbook by using OpenXML SDK, but your client will need to handle Office 2007 file formats by using Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats.
I trying to export an HTML table named Table that is dynamically binded to ViewData.Model in C#. I have a method called export that is called based on another method's actions. so everything before that is set up.. I just don't know how to export the data to a CSV or Excel file.. So when the I step inside the Export method I don't know what next to do to export the table. Can someone help me
public void Export(List<data> List)
{
//the list is the rows that are checked and need to be exported
StringWriter sw = new StringWriter();
//I don't believe any of this syntax is right, but if they have Excel export to excel and if not export to csv "|" delimeted
for(int i=0; i<List.Count;i++)
{
sw.WriteLine(List[i].ID+ "|" + List[i].Date + "|" + List[i].Description);
}
Response.AddHeader("Content-Disposition", "attachment; filename=test.csv");
Response.ContentType = "application/ms-excel";
Response.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");
Response.Write(sw);
Response.End();
}
I don't quite understand the whole "export an HTML table named Table that is dynamically binded to ViewData.Model" so I'll just ignore that and focus on your Export(List<data> list) method. Btw, you never really mentioned what was going wrong and where.
I see you had written "if they have Excel export to excel and if not export to csv" - I would personally just export it as a CSV file in both cases because excel can handle csv files no problem.
So with that in mind, here would be my export method based on your code.
public void Export(List<DataType> list)
{
StringWriter sw = new StringWriter();
//First line for column names
sw.WriteLine("\"ID\",\"Date\",\"Description\"");
foreach(DataType item in list)
{
sw.WriteLine(string.format("\"{0}\",\"{1}\",\"{2}\"",
item.ID,
item.Date,
item.Description));
}
Response.AddHeader("Content-Disposition", "attachment; filename=test.csv");
Response.ContentType = "text/csv";
Response.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");
Response.Write(sw);
Response.End();
}
This is an excellent example, but I think that need a globalization modification.
String ltListSeparator = CultureInfo.CurrentUICulture.TextInfo.ListSeparator;
sw.WriteLine(string.format("{0}" + ltListSeparator + "{1}" + ltListSeparator + "{2}", item.ID, item.Date, item.Description));
I think your controller action method will need to wrap the data items in an html table which you may want to do any way you like, So your html+ data will be stored in a string and then you could do something like below- (its not exacly built for MVC but its easy to modify for it).
Response.ClearContent();
Response.AddHeader("content-disposition", attachment);
Response.ContentType = "application/ms-excel";
Response.Write(yourDataAndHtmlAsString);
Response.End();
CSV is a simple format and can be built up easily as a string.
http://en.wikipedia.org/wiki/Comma-separated_values
You could create an excel spreadsheet of what you think the end product should look like, save as CSV, open it in notepad and try and replicate it using a string builder.