Define mathematical expressions at run-time

[johnix]

Hi,
i need to implement a feature in my program to enable users to defining mathematical expressions.
Suppose we have this class

    public class test3
    {

        public float x = 2;
        public float y = 3;
        public float z = 0;
        public float w = 0;

        public double MyEquation()
        {
            return 0.0F;
        }

    }

i need to read an external file (txt or xml) that contain string equation, for example (x * x + 0.14 + y)
and replace at run-time the return value of method 'MyEquation' with the new equation

        public double MyEquation()
        {
            return (x * x + 0.14 + y) ;
        }

available fields are many (x, y, z, w, k, n, m, j, etc ..) and I can not know how many and what fields the user will use in its expression
there is a way to do this?

 

[JohnH]

If you search for "c# math equation runtime" or "c# math expression parser" and similar you will find many options for doing this.
This thread lists many of them: c# - Is there a string math evaluator in .NET? - Stack Overflow
For example this library that looks easy to use: NCalc - Mathematical Expressions Evaluator for .NET - Home

 

[olduh]

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for personnal use I developped a C# parser generator https://github.com/b3b00/csly . you can find an expression evaluator that could match your needs with some tweaks.

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