Is controller class instance created and a respective instance method is called at each request in ASP.NET Framework?

Question

Are web application type and controller the same things in ASP.NET Framework?

In the CLR via C# there is the following excerpt present:

When future clients make requests of an already running web application, ASP.NET doesn’t create a new AppDomain; instead, it uses the existing AppDomain, creates a new instance of the web application’s type, and starts calling methods. The methods will already be JIT-compiled into native code, so the performance of processing all subsequent client requests is excellent.

Does it mean that controller class instance is created and a respective instance method is called at each request in ASP.NET Framework?

E.g. if I have the following controller:

[RoutePrefix("prefix")]
public class FooController : ApiController
{
    [HttpGet]
    [Route("something/{id}")]
    public string GetSomething(int id)
    {
        return "something";
    }
}

Does it mean that each time I request the prefix/something/47 (any number here instead of the 47 and host before the url should be present) a new instance of the FooController is created and the FooController.GetSomething method is called?

Tyler Hundley · Accepted Answer · 2020-03-04 20:17:08Z

4

Yes, a new Controller instance is used per request. As stated in this answer to an older question, new instances are used to avoid potential state issues with handling multiple requests.

answered Mar 4, 2020 at 20:17

Tyler Hundley

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2 Comments

qqqqqqq Over a year ago

That is helpful. Thank you. I will try to accept your answer asap.

user8107351 Over a year ago

this article can also help you understand it more - hogaf.github.io/archive/2014/11/13/….

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