Dependency Injection with Ninject and Filter attribute for asp.net mvc
asp.net-mvc, asp.net-mvc-3, ninject
Solution
See this answer: Custom Authorization MVC 3 and Ninject IoC
If you want to use constructor injection then you need to create an attribute and a filter.
/// Marker attribute
public class MyAuthorizeAttribute : FilterAttribute { }
/// Filter
public class MyAuthorizeFilter : IAuthorizationFilter
{
private readonly IUserService _userService;
public MyAuthorizeFilter(IUserService userService)
{
_userService = userService;
}
public void OnAuthorization(AuthorizationContext filterContext)
{
var validUser = _userService.CheckIsValid();
if (!validUser)
{
filterContext.Result = new RedirectToRouteResult(new RouteValueDictionary { { "action", "AccessDenied" }, { "controller", "Error" } });
}
}
}
Binding:
this.BindFilter<MyAuthorizeFilter>(System.Web.Mvc.FilterScope.Controller, 0).WhenControllerHas<MyAuthorizeAttribute>();
Controller:
[MyAuthorizeAttribute]
public class YourController : Controller
{
// ...
}
Problem
I'm writing a custom Authorization Filter for asp.net mvc 3. I need to inject a userservice into the class but I have no idea how to do this. ``` public class AuthorizeAttribute : FilterAttribute, IAuthorizationFilter { private IUserService userService; private string[] roles; public AuthorizeAttribute(params string[] roles) { this.roles = roles; } public void OnAuthorization(AuthorizationContext filterContext) { throw new NotImplementedException(); } } ``` I'm using ninject for dependency injection. I do not want to use a Factory or service locator pattern. My bindings look like this in the global.acsx: ``` internal class SiteModule : NinjectModule { public override void Load() { Bind<IUserService>().To<UserService>(); } } ```