How can I parse math operator from string in c#

Question

I've a dropdown like this

                    @Html.DropDownList("Operator", new List<SelectListItem>
                {
                    new SelectListItem() {Text = "/", Value = "/", Selected = true},
                    new SelectListItem() {Text = "*", Value = "*"},
                    new SelectListItem() {Text = "+", Value = "+"},
                    new SelectListItem() {Text = "-", Value = "-"}
                }, new {@Class = "form-control", @Id = "Operator"})

In my action method I want to use var1 Operator var2. Suppose 10 Operator 15 = 25 when Operator = "+" Is it possible?

There are no built-in ways (though you can search for "C# evaluate math expression" - it may give you some ideas). If you don't need full-fledged math expression evaluation, then you can just use a simple `switch` (or `map/Dictionary` of `Func`) to do the job. — Eugene Podskal, Feb 28 '16 at 09:13
Possible duplicate of [Evaluate C# string with math operators](http://stackoverflow.com/questions/5838918/evaluate-c-sharp-string-with-math-operators) — Eugene Podskal, Feb 28 '16 at 09:14

score 3 · Answer 1 · edited Jun 20 '20 at 09:12

3

Recently I was using open-source library for parsing math expressions provided as strings. The parser / evaluator name is mXparser.

http://mxparser.codeplex.com/

http://mathparser.org/

Example:

Expression e = new Expression("2+3/(4+1)");
double v = e.calculate();

Additionally - this software is using mXparser as well - you can learn the syntax Scalar Calculator app.

Best regards

edited Jun 20 '20 at 09:12

Community

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answered Feb 29 '16 at 22:51

Leroy Kegan

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How can I parse math operator from string in c#

1 Answers1