Textbox containing calculation formula

Question

I would like to create a textbox in a windows form using C# .Net, that will be able to handle simple calculations. For example, if the user writes in the textbox =5*7 then when the textbox gets validated the textbox.Text = 35.

My question is how can I convert the string "=5*7" to doubles and symbols so as to make the calculations.

Take a look at this [SO question](http://stackoverflow.com/questions/355062/is-there-a-string-math-evaluator-in-net). — Alessandro D'Andria, Mar 22 '16 at 11:56
This may be a duplicate, but the answers on that post do not suggest CSharp.Scripting which is ,imo, a superior solution to any of them. — Crowcoder, Mar 22 '16 at 13:07

score 2 · Answer 1 · answered Mar 22 '16 at 12:22

2

use the CodeAnalysis.CSharp.Scripting library here how to use it wiki

answered Mar 22 '16 at 12:22

Ilyes GHOMRANI

122
15

Crowcoder · Answer 2 · 2016-03-22T13:27:02.503

You can use CodeAnalysis.CSharp.Scripting library for this. It is available from Nuget

using Microsoft.CodeAnalysis.CSharp.Scripting;
using System;

namespace ExpressionParser
{
    class Program
    {
        static void Main(string[] args)
        {
            //Demonstrate evaluating C# code
            var result = CSharpScript.EvaluateAsync("System.DateTime.Now.AddDays(-1) > System.DateTime.Now").Result;
            Console.WriteLine(result.ToString());

            //Demonstrate evaluating simple expressions
            var result2 = CSharpScript.EvaluateAsync(" 5 * 7").Result;
            Console.WriteLine(result2);
            Console.ReadKey();
        }
    }
}

nuget packages:

I tried including the nuget package `Microsoft.CodeAnalysis.CSharp.Scripting 1.1.1`, but that does not include the namespace `Microsoft.CodeAnalysis.CSharp.Scripting` - so the example won't compile on my machine. As it seems, `CSharpScript` does not exist. Could you shed a light on this please? — Matt, Mar 22 '16 at 13:06
You are right, thank you, I added the package to an empty console project and inserted your code. The key is to change the framework version to 4.6.1 before adding the nuget package - In my case the default setting for the framework was 4.5.2, which did not work (it was trying to import something but failed). After that change, it worked instantly. — Matt, Mar 22 '16 at 14:03

Textbox containing calculation formula

2 Answers2