c# convert string expression to a boolean expressi

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Is it possible to convert a string expression into a boolean condition?

For example, I get the following string:

var b = "32 < 45 && 32 > 20"

I would like to create a bool expression out of this and invoke it. The string representation is also flexible (to make it more fun), so it allows ||, &&, ().

Answer 1

I think creating an interpreter for this string would not take too long time.

http://www.industriallogic.com/xp/refactoring/implicitLanguageWithInterpreter.html

here you can find information about design that can be used to create it.

Answer 2

If you're dealing with relatively simple mathematical expressions then a straightforward implementation of the shunting-yard algorithm should do the trick.

Answer 3

Have a look at Flee (Fast Lightweight Expression Evaluator) on CodePlex.

Answer 4

If it follows all C# expression rules then compile it as dynamic code as per http://www.west-wind.com/presentations/dynamiccode/dynamiccode.htm

Answer 5

Take a look at my library, Proviant. It's a .NET Standard library using the Shunting Yard algorithm to evaluate boolean expressions. You could also implement your own grammar.

Answer 6

You could take a look at JINT (Javascript Interpreter for .NET) http://jint.codeplex.com/