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StreamWriter to output grid into .xls

Posted on 2013-06-26
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Last Modified: 2013-11-08
Hi experts,

As above I need to output a wpf grid control into xls. I tried the below code to start, however when I try to open the xls I get 'the file you are trying to open is in a different format than specified by the file extension '

Code so far...

 var writer = new System.IO.StreamWriter("C:\\Users\\dean.lee\\Desktop\\moi.xls");

                writer.Write("Header1");
                writer.Write("Header2");
                writer.WriteLine();
                writer.Close();

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Ideally I want the above and then I will FOR loop through the grid to populate with data.

Thanks,
Dean
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Question by:deanlee17
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Expert Comment

by:käµfm³d 👽
ID: 39279820
You say ".xls", but do you really mean an Excel file, or are you simply trying to write a file that Excel can open (e.g. .csv)?
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Author Comment

by:deanlee17
ID: 39279827
I mean an xls ideally, I really dont want a .csv file.
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LVL 75

Expert Comment

by:käµfm³d 👽
ID: 39279902
Then you'll need to add a reference to the Excel Interop libraries and become cozy with the Excel object model. You'll need Office installed in order to be able to reference the Excel Interop libraries.
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Author Comment

by:deanlee17
ID: 39279908
I'm sensing you don't recommend the above?

So its easier to just output to CSV? I just didn't want the user having to run through the process of choosing comma delimited etc etc as opposed to the file just opening.

Cheers.
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Accepted Solution

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käµfm³d   👽 earned 500 total points
ID: 39279913
The above won't work for an Excel file. An Excel file (we're talking .xls here) is a binary file, not a text file. StreamWriter isn't going to work for creating a .xls.

So its easier to just output to CSV?
In my opinion:  yes.

I just didn't want the user having to run through the process of choosing comma delimited etc etc as opposed to the file just opening.
I don't have Office installed on my home machine to confirm, but as I recall when you install Excel it registers itself as the default application for .csv files (and even if it doesn't you could change this). I believe comma-separated files are opened automatically, without the user having to do anything extra. I can confirm this tomorrow when I get to the office.

Now if you choose to delimit the file using something other than a comma...that's another story  : )
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Author Comment

by:deanlee17
ID: 39280563
haha ok cool.

Well I am happy to use a CSV but ideally I need it to open without asking the user any questions, I realise this may not be possible?
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