How require authorization within whole ASP .NET MVC application

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Simplest way is to add Authorize attribute in the filter config to apply it to every controller.

public class FilterConfig
{
    public static void RegisterGlobalFilters(GlobalFilterCollection filters)
    {
        filters.Add(new HandleErrorAttribute());

        //Add this line
        filters.Add(new AuthorizeAttribute());
    }
}

Another way is to have all of your controllers inheriting from a base class. This is something I do often as there is almost always some shared code that all of my controllers can use:

[Authorize]
public abstract class BaseSecuredController : Controller
{
    //Various methods can go here
}

And now instead of inheriting from Controller, all of your controllers should inherit this new class:

public class MySecureController : BaseSecuredController
{
}

Note: Don’t forget to add AllowAnonymous attribute when you need it to be accessible to non-logged in users.

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