How to get custom attributes for a controller in asp.net core rc2

Question

I have created a custom attribute :

[AttributeUsage(AttributeTargets.Method| AttributeTargets.Class)]
public class ActionAttribute : ActionFilterAttribute
{
    public int Id { get; set; }
    public string Work { get; set; }
}

my controller :

[Area("Administrator")]
[Action(Id = 100, Work = "Test")]
public class HomeController : Controller
{
    public IActionResult Index()
    {
        return View();
    }
}

my code : i use reflection to find all Controllers in the current assembly

 Assembly.GetEntryAssembly()
         .GetTypes()
         .AsEnumerable()
         .Where(type => typeof(Controller).IsAssignableFrom(type))
         .ToList()
         .ForEach(d =>
         {
             // how to get ActionAttribute ?
         });

is it possible to read all the ActionAttribute pragmatically?

Solution

To get an attributes from the class you can do something the following:

typeof(youClass).GetCustomAttributes<YourAttribute>();
// or
// if you need only one attribute
typeof(youClass).GetCustomAttribute<YourAttribute>();

it will return IEnumerable<YourAttribute>.

So, within your code it will be something like:

Assembly.GetEntryAssembly()
        .GetTypes()
        .AsEnumerable()
        .Where(type => typeof(Controller).IsAssignableFrom(type))
        .ToList()
        .ForEach(d =>
        {
            var yourAttributes = d.GetCustomAttributes<YourAttribute>();
            // do the stuff
        });

Edit:

In case with CoreCLR you need to call one more method, because the API has been changed a bit:

typeof(youClass).GetTypeInfo().GetCustomAttributes<YourAttribute>();

Comments

[StackOverflow4855]

'Type' does not contain a definition for 'GetCustomAttributes'

[Sander Visser]

Assembly.GetEntryAssembly() will get the assembly that is used as entry. So the behavior will be different in as example your unit tests.