C# - Evaluate Excel Logical Formulas

Question

I have an Application that need to evaluate Excel Logical Formulas and I use Excel DLL to do this, but DLL isn't it very efficient.

.NET Framework (C#) has any Class that can make this Job?

An sample

I Provide this

=IF(AND(10>=-5;10<0);(-3,8*10+335);IF(AND(10>=0;10<5);(1,4*10+335);IF(AND(10>=5;10<14,4);(-1,2766*10+348,38);IF(AND(10>=14,4;10<25);(-1,5094*10+351,74);IF(AND(10>=25;10<=45);(-1,4*10+349);0)))))

And get this

335,614

Thanks

Answer 1

There are a couple of math expression parsers out there, e.g. lundin, but I'm not sure they'll parse an excel expression for you. Does it have to be excel?

Answer 2

You could have a look at

Implementing an Excel-like formula engine

Answer 3

We use SpreadsheetGear to do this - but it does a whole lot more than just evaluating formulas, so might be overkill for you.

It does seem to be fast, and provides a quite easy to use .NET API, too.

Answer 4

Yes, agreed, the Excel.Application.Evaluate method can be slow. It usually suits my needs, but it's not lightening fast.

I think the best source for evaluating Excel formulas without the Excel object mode is:

• Excel Formula Parsing, in C#

Some other related articles:

• Invesitgation into Excel Syntax and a Formula Grammar
• Runtime code generation to speed up spreadsheet computations
• VectorExcel
• Excel Formula Formatter
• Implementing an Excel-like formula engine

Hope this helps...