c# - Update base controller variable values but all derived controllers are not updated in ASP.NET Core

Question

This is my BaseController:

public abstract class BaseController : Controller
{
    public Int64 CompanyId { get; set; } // I need to update this property
}

I have another 2 controllers, CompanyController:

public class CompanyController : BaseController
{
   
    public IActionResult ChangeCompany(long CompanyId = 35)  //
    {   
        base.CompanyId = CompanyId;
        // other code
    }

    public IActionResult GetCompany()  //
    {   
        return base.CompanyId  // return 35
    }
}

and AccountController:

public class AccountController : BaseController
{
    public IActionResult GetCompany()  //
    {   
        return base.CompanyId  // return 0
    }
}

How can I get the updated CompanyId value from AccountController?

question from:https://stackoverflow.com/questions/65857005/update-base-controller-variable-values-but-all-derived-controllers-are-not-updat

Answer 1

You can't. Each object is different and the base class is just a template that your other classes extend. Every new object will create and maintain their own CompanyId variable, so you can't and shouldn't change the one by changing the other.

Check the static keyword if you want one value only for all the classes public static Int64 CompanyId { get; set; }

Basically this:

public class CompanyController : BaseController
{
   
    public IActionResult ChangeCompany(long CompanyId = 35)  //
    {   
        base.CompanyId = CompanyId;
        // other code
    }

    public IActionResult GetCompany()  //
    {   
        return base.CompanyId  // return 35
    }

}

Is the same as this (though without inheritance, you can't even know which parts the two classes have in common):

public class CompanyController
{
    public Int64 CompanyId { get; set; } // I need to update this property
    public IActionResult ChangeCompany(long CompanyId = 35)  //
    {   
        base.CompanyId = CompanyId;
        // other code
    }

    public IActionResult GetCompany()  //
    {   
        return base.CompanyId  // return 35
    }

}