How to Access a Controller from Startup.cs

Question

I’m trying to access a controller from the Startup.cs class. This is a .NET Core application running with Angular for the frontend. Can you please advise me how I can access the controller from the Startup class?

I need to execute some code before

public async Task<IActionResult> InitiateProcess(string returnUrl)  
{  
  var hello = _configuration[ConfigSetting];  
  await = _ServiceProvider.InitiateJobAsync(hello, returnUrl);  

  return new EmptyResult();  
                
}  

Answer 1

At startup there is no request or http context, which are typically injected and used by the controller. What ever code you want to call should be refactored to a library call from both the controller and startup.

Answer 2

The application should use the controller so it call an API for authentication. Once the authentication is authorized, the external tool calls another method.

All what I need for now is to call the method listed on the question which is what needs to be called when the application is started.