.net 6 web api request change float model

Question

I send request from web:

in model:

public float Team { get; set; }

But i got incorrect value:

What is problem with rounded ? How fix it in webapi?

I have many method , fields , levels i dont want resolve by hand every fields by Math.Round or other functions ....

update 1. for @MdFaridUddinKiron

public IActionResult Save([FromBody] Model req){
     return Ok();
}

public class Model {
   public float Team { get; set; }
}

@Maytham i know about it. Question how its fix in asp.net web api. In NodeJs we havent it problem — padavan, Apr 07 '22 at 10:45
in asp.net is there no single approach to the web api solution? I wrote in question "have many method , fields , levels i dont want resolve by hand EVERY fields by Math.Round or other functions" — padavan, Apr 07 '22 at 10:55
Could you please share your full controller along with the model. — Md Farid Uddin Kiron, Apr 08 '22 at 12:41
How are you sending the request? I have just reproduced your issue and I am getting `0.91` as expected. No issue I have founded. Would you kindly check your code? How the the value being sent from your `client side app` I think problem is there not in API. In cases where you are using *.js* kind of language, double check that the value is being passed as expected, since *javascript* often adds extra precision. — Md Farid Uddin Kiron, Apr 13 '22 at 08:36

Jiulia · Answer 1 · 2022-04-09T13:18:51.257

try using a double instead.

floats, by how they are rapresented, are not good for precision unless we are talking about extremely small numbers.

Here is a nice little article explaining why floats may lose precision (its for cpp, but the general concept should be the same for c#): https://learn.microsoft.com/en-us/cpp/build/why-floating-point-numbers-may-lose-precision?view=msvc-170

Edit: I found this 13 years old question in the suggested section that might definitivelty help you understand more about floats and doubles: Difference between decimal, float and double in .NET?

1 Answers1