Question

C#/Asp.Net Append a Excel Sheet/DataTable to an existing Workbook

Asked by: naspinski

Currently I am using a DataTable to make an Excel Spreadsheet with Math Berseth's class from here http://mattberseth.com/blog/2007/04/export_gridview_to_excel_1.html

This works fine, but now I want it to do something else, I want to take a .xls workbook (call this X) that has a bunch of pre-populated sheets and append the new sheet I am making with my program (call this Y)  So that when I save the file, it saves as one file, with the first sheet as my newly made sheet, and the reset of the sheets the ones from X.

Does that make sense?  What do I need to clarify?
Where do I start?

Thanks.

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Asked On
2008-04-30 at 22:34:37ID23367689
Tags

excel

,

asp.net

,

c#

Topics

C# Programming Language

,

.NET

,

Programming for ASP.NET

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Answers

 

by: LordWabbitPosted on 2008-05-01 at 04:30:49ID: 21477719

Here you go, you might want to write this in VB instead, C# does not do optional parameters so you end up with an awful lot of Type.Missing which can get tedious.  I saw a c# wrapper for ms office once which used overloads and hid all the Type.Missing gunk, but a quick google didn't bring up anything.  Working with office can create a lot of orphaned excel processes (till you get everything working 100%) so keep task manager open and check for any excel processes which are locking your test files.  Even better for testing purposes write a small method which checks for any open excel processes and nukes them.  

One thing - I was not sure which version of office you were using, I am using office 2007 and the com interops created between different versions will not be the same - however I have not found any significant differences in the actual methods and collections used (at least not for what I have had to do).

            Microsoft.Office.Interop.Excel.Application oExcel = new Microsoft.Office.Interop.Excel.Application();
            oExcel.Workbooks.Open(@"C:\eatme\Book1.xlsx", Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
            oExcel.Workbooks[1].Sheets.Add(Type.Missing, oExcel.Workbooks[1].Sheets[1], 1, @"C:\eatme\Book2.xlsx");
            if (System.IO.File.Exists(@"C:\eatme\Book3.xlsx")) System.IO.File.Delete(@"C:\eatme\Book3.xlsx");
            oExcel.Workbooks[1].SaveAs(@"C:\eatme\Book3.xlsx", Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
            oExcel.Quit();
            MessageBox.Show("Done");

                                              
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by: naspinskiPosted on 2008-05-01 at 05:00:51ID: 21477835

Thanks a lot for the feedback here!  I think this is on the right track.  We have office 2003 here, so not quite the same, but hopefully close.  I am getting the following error when I try it out:

Server Error in '/testing' Application.
Exception from HRESULT: 0x800A03EC
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Runtime.InteropServices.COMException: Exception from HRESULT: 0x800A03EC

Any ideas?
I am gonna hit google...

CODE:

string baseFile = Server.MapPath(".") + "\\base.xls";
string newSheet = Server.MapPath(".") + "\\uploaded\\05-01-08_stan.w.naspinski.xls";
string newFile = Server.MapPath(".") + "\\uploaded\\chnaged_05-01-08_stan.w.naspinski.xls";
 
Microsoft.Office.Interop.Excel.Application oExcel = new Microsoft.Office.Interop.Excel.Application();
oExcel.Workbooks.Open(baseFile, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
oExcel.Workbooks[1].Sheets.Add(Type.Missing, oExcel.Workbooks[1].Sheets[1], 1, newSheet);
if (System.IO.File.Exists(newSheet)) System.IO.File.Delete(newSheet);
oExcel.Workbooks[1].SaveAs(newFile, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
oExcel.Quit();

                                              
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by: LordWabbitPosted on 2008-05-01 at 05:19:56ID: 21477931

It's probably permissions, give everyone read and write access to the folder in question, if the problem goes away then start reducing access to the folder (only allow iis account and asp.net accounts etc.) till you find the correct permissions.

 

by: LordWabbitPosted on 2008-05-01 at 05:21:57ID: 21477938

oh yeah and
if (System.IO.File.Exists(newSheet)) System.IO.File.Delete(newSheet);
should be
if (System.IO.File.Exists(newFile)) System.IO.File.Delete(newFile);

 

by: naspinskiPosted on 2008-05-01 at 05:51:03ID: 21478068

I am running it on my locl machine, and permissions are wide open...
I noticed that every time I run it, it sets all the folders I am working in to Read Only?
I changed a couple of arguments to try and stop this, but it's not working.

Here is my code now:

string baseFile = Server.MapPath(".") + "\\base.xls";
string newSheet = Server.MapPath(".") + "\\uploaded\\05-01-08_stan.w.naspinski.xls";
string newFile = Server.MapPath(".") + "\\uploaded\\chnaged_05-01-08_stan.w.naspinski.xls";
 
Microsoft.Office.Interop.Excel.Application oExcel = new Microsoft.Office.Interop.Excel.Application();
oExcel.Workbooks.Open(baseFile, Type.Missing, false, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
oExcel.Workbooks[1].Sheets.Add(Type.Missing, oExcel.Workbooks[1].Sheets[1], 1, newSheet);
if (System.IO.File.Exists(newFile)) System.IO.File.Delete(newFile);
oExcel.Workbooks[1].SaveAs(newFile, Type.Missing, Type.Missing, Type.Missing, Type.Missing, false, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
oExcel.Quit();
Response.Write("done");

                                              
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by: LordWabbitPosted on 2008-05-01 at 06:09:50ID: 21478178

K, just ran your code with some minor modifications to the paths and file names and it runs perfectly - however I am using the visual studio development server for my server instead of IIS not sure what you are using?  is the error message the same as the one you posted before?

            string baseFile = Server.MapPath(".") + "\\Bin\\Book1.xlsx";
            string newSheet = Server.MapPath(".") + "\\Bin\\Book2.xlsx";
            string newFile = Server.MapPath(".") + "\\Bin\\Book3.xlsx";
 
            Microsoft.Office.Interop.Excel.Application oExcel = new Microsoft.Office.Interop.Excel.Application();
            oExcel.Workbooks.Open(baseFile, Type.Missing, false, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
            oExcel.Workbooks[1].Sheets.Add(Type.Missing, oExcel.Workbooks[1].Sheets[1], 1, newSheet);
            if (System.IO.File.Exists(newFile)) System.IO.File.Delete(newFile);
            oExcel.Workbooks[1].SaveAs(newFile, Type.Missing, Type.Missing, Type.Missing, Type.Missing, false, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
            oExcel.Quit();
            Response.Write("done");

                                              
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by: LordWabbitPosted on 2008-05-01 at 06:10:46ID: 21478188

are there any orphaned excel processes which might be locking files?

 

by: naspinskiPosted on 2008-05-01 at 06:15:08ID: 21478222

I am going to check with my Systems guys, it seems we don't have the permissions to remove read-only... I will get back with an update.  They should help me out as I am writing it for them :)

 

by: naspinskiPosted on 2008-05-02 at 00:30:47ID: 21485049

Turns out the file they wanted me to copy was protected!

Your code worked great!  Thanks a lot!

 

by: naspinskiPosted on 2008-05-02 at 00:31:07ID: 31454023

perfect

20120131-EE-VQP-002

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