Using C# in Excel

kean

Mathematics Student
Folks,

Anyone has experience using C# in Excel? I would like to hear from you. Please feel free to discuss.

Thanks,
K
 

joe_bradley

Member
There is a thread out there that already discusses a little of it:

Integrate C++ program into VBA

Are you asking because this is something you have to do? Also, do you want to use C# as a replacement for VBA macros, or do you want to call the Excel object model from a C# program? Those are totally different issues.
 

kean

Mathematics Student
C#

Joe, thanks. What I mean is integrated C# and Excel (not C++, it is C#).

Secondly, I want to know how call C# object model from Excel and vice versa.


There is a thread out there that already discusses a little of it:

Integrate C++ program into VBA - QuantNetwork - Financial Engineering Forum

Are you asking because this is something you have to do? Also, do you want to use C# as a replacement for VBA macros, or do you want to call the Excel object model from a C# program? Those are totally different issues.
 

kean

Mathematics Student
..

More precise.."Calling the IMSL C# Numerical Library from Microsoft Excel"

Please let me know if you have any recommendation..or articles will do.:)

Joe, thanks. What I mean is integrated C# and Excel (not C++, it is C#).

Secondly, I want to know how call C# object model from Excel and vice versa.
 

joe_bradley

Member
Unfortunately, C# is not "integrated" into office, something you no doubt found out already. I believe the next version of office allows this, but even so that will not help everyone, there are many spreadsheets out using copious VBA code there that cannot be retired, so they will lurch onward zombie-like through the years, eating the brains of those unfortunate enough to have to maintain them.

But I digress.

Basically, VBA communicates with other platforms using an object model known as COM. It does not use .NET. So, you must either use 1) a "com-callable wrapper" technology to present C# objects to VBA as if they were COM objects or 2) a "runtime-callable wrapper" used to present the Excel object model to C# as if it were a .NET library.

If you want to control C# code from your excel sheet (which is probably what you want to do) you have to pick #1. If you want to control your excel sheet from C# code, you have to pick #2. If you pick #1, you will face wretched performance. If you pick #2 you will have to deal with Excel's wretched object model.

Be assured you will have to refer to msdn.microsoft.com quite a bit if you want to do something like this. The problem isn't figuring out how to do this - Microsoft's tools make it easy. The problem is figuring how to handle horrendous performance or debugging issues. Good luck.
 

kean

Mathematics Student
VSTO

Joe, thanks again.

I think VSTO 2005 SE will do the job. Yes, a VBA wrapper for C# will do the job. I saw a person demonstrated Matlab integrated C#. I have contacted Microsoft and hopefully I can hear some good news soon.

I think MS announced earlier that the intention of VSTO is to "replace" current VBA platform. Due to Excel is using COM object model so porting to .Net may take some times. However, I do not see any tedious problems for MS.

I mean people who use VB 6 or VBA can still use their applications. For new development, the trend is going forward to .Net platform. As far as trading system platform I will vote for .Net.

Cheers,
K
 

Vic_Siqiao

Member
it is not hard to use C# add-in in Excel under .NET framework; but C++.NET is not that easy to handle, i think.
 

Adam G

New Member
I've had so much trouble with putting .NET on top of Excel, that I would not recommend it. For me it worked fine up to a point, but once I started doing a large amount of calculations/cell changes things would bog down and eventually would crash Excel. It got to be so much trouble that I gave up and ported it to be a stand alone VB .NET program. Things work great now, and it really didn't take that much more programming.
 

kean

Mathematics Student
In VSTO 2008, it is not difficult at all. All built in and it is easy to use. All we need to do is to create shared assembly in VSTO and then check the add-in. You can easily share from Excel. There are at least two vendors offer C# QF tools. I couldn't remember the names. I will let you know if I find out.

These vendors provide easy solutions for metrics solution in C# and other stuff like graphical solutions.

I've had so much trouble with putting .NET on top of Excel, that I would not recommend it. For me it worked fine up to a point, but once I started doing a large amount of calculations/cell changes things would bog down and eventually would crash Excel. It got to be so much trouble that I gave up and ported it to be a stand alone VB .NET program. Things work great now, and it really didn't take that much more programming.
 

Andy Nguyen

Member
An update to the post above.
I have added the Euro option pricing (BS model) which I wrote as a stand alone C# app into Excel 2007 via VSTO. This involves creating a new ribbon that when you click will display/hide the panel where you calculate.

Here is a screenshot of the C# code inside Excel 2007 as an addin. It shows a custom ribbon as well as the input inside a task panel on the right.
 

Attachments

raywin

New Member
Hi Andy

Great Job, Could you please give me more information on how to do that or Could you please post some sample code? Many many thanks!

raywin
 

Excel Net

New Member
Have fun. Keep in mind that I tested it with VS2008 Team edition and Excel 2007.
Looks nice Andy. I just want to add my opinion on Excel and .NET intergration (I know it might looks like an ad but I believe this information might be really usefull to visitors of this forum and could save them a lots hours of programming).

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and
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If you have any questions about Excel4Net or a general question on Excel and .NET development - you can either post it here (if it's ok with Andy) or email me to beta@excel4net.com.

Happy Holidays!
 

Excel Net

New Member
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