[Randomize]

using Microsoft.JScript;        // needs a reference to Microsoft.JScript.dll
using Microsoft.JScript.Vsa;    // needs a reference to Microsoft.Vsa.dll

// ...

string expr = "7 + (5 * 4)";
Console.WriteLine(JScriptEval(expr));    // displays 27

// ...

public static VsaEngine _engine = VsaEngine.CreateEngine();

public static double JScriptEval(string expr)
{
    // error checking etc removed for brevity

    return double.Parse(Eval.JScriptEvaluate(expr, _engine).ToString());
}

Взято тут http://stackoverflow.com/questions/1...active#tab-top