How to properly create a C# REST service?

Question

The phrasing of my question may be flawed but please know that I am new to C# and REST and I only have experience writing basic scripts.

My goal is to create a service that allows a client to consume it and access basic arithmetic functions.

My logic (which is probably wrong) is: Create a class called Sum (or whatever the operation is), implement the class on the Controller within an HTTP Post method and return the expected value to the client. Is this correct?

Here is the simple sum class:

 public class Sum { public double value1 { get; set;} public double value2 { get; set;} public double Process(double value1, double value2) { double result = value1 + value2; return result; } }

Here is the controller method which gives me an error because it cannot convert the double variable to IHTTPActionResult.

 public class CalculatorController : ApiController { public IHttpActionResult Post(double val1, double val2) { Sum sum = null; sum.value1 = val1; sum.value2 = val2; double result = sum.Procesar(val1, val2); return result; } }

Based on my brief experience I cannot think on a different way to implement the class on the Controller method, is there any better way to accomplish my goal? References to other sites and documentation are appreciated as well.

Thank you.

sayah imad · Accepted Answer · 2021-02-07 08:49:41Z

1

as a solution it's possible to return double, you need also to instantiate your class Sum otherwise you will have an error during execution .

You will find the code below :

public class CalculatorController : ApiController { public double Post(double val1, double val2) { Sum sum = new Sum(); sum.value1 = val1; sum.value2 = val2; double result = sum.Process(val1, val2); return result; } }

answered Feb 7, 2021 at 8:49

sayah imad

1,5753 gold badges16 silver badges25 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

tina Over a year ago

Hi, thank you for your reply. If the actual method is a double, will it be recognized as an HTTP resource? Trying it on Postman gives me a 404.

sayah imad Over a year ago

of course , would add your postman request

tina Over a year ago

{ "value1":"2", "value2":"3" } Is just a json value, the response is ""MessageDetail": "No action was found on the controller 'Calculadora' that matches the request.""

sayah imad Over a year ago

it's normal because it based on your action name, or if you want you can add http verb and actionname annotation .

Collectives™ on Stack Overflow

How to properly create a C# REST service?

1 Answer 1

4 Comments

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

4 Comments

Related