我正在使用MVC3和Ninject启动Web应用程序.在Global.asax文件中我还需要一个依赖项,它需要是一个单例.
我认为应该是这样的：
public class MvcApplication : NinjectHttpApplication
{
IUserAuthentication _auth;
public MvcApplication()
{
base.AuthenticateRequest += new EventHandler(MvcApplication_AuthenticateRequest);
}
protected override IKernel CreateKernel()
{
var _kernel = new StandardKernel(new SecurityModule());
_auth = _kernel.Get<IUserAuthentication>();
return _kernel;
}
void MvcApplication_AuthenticateRequest(object sender,EventArgs e)
{
_auth.ToString();
}
但是当我调用MvcApplication_AuthenticateRequest时,我看到_auth为null.
然后我尝试这样：
public class MvcApplication : NinjectHttpApplication
{
ItUserAuthentication _auth;
IKernel _kernel;
public MvcApplication()
{
_kernel = new StandardKernel(new SecurityModule());
_auth = _kernel.Get<IUserAuthentication>();
base.AuthenticateRequest += new EventHandler(MvcApplication_AuthenticateRequest);
}
protected override IKernel CreateKernel()
{
return _kernel;
}
void MvcApplication_AuthenticateRequest(object sender,EventArgs e)
{
_auth.ToString();
}
但现在我可以看到构造函数被多次调用,因此我将有几个IKernel,我想单例实例在我的应用程序范围内不会是单例.
我该怎么办？使用静态变量？
解决方法
我们就是这样做的,我做了一些测试,我的AuthService似乎只进入他的控制器一次：
public class MvcApplication : NinjectHttpApplication
{
public static void RegisterRoutes(RouteCollection routes)
{
routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
routes.MapRoute(
"Default",// Route name
"{controller}/{action}/{id}",// URL with parameters
new { controller = "Home",action = "Index",id = UrlParameter.Optional } // Parameter defaults
);
}
protected override IKernel CreateKernel()
{
var kernel = new StandardKernel();
kernel.Load(Assembly.GetExecutingAssembly());
kernel.Bind<ISession>().To<MongoSession>().InRequestScope();
kernel.Bind<IAuthenticationService>().To<AuthenticationService>().InSingletonScope();
kernel.Bind<IMailer>().To<Mailer>().InRequestScope();
kernel.Bind<IFileProvider>().To<MongoFileProvider>().InRequestScope();
return kernel;
}
protected override void OnApplicationStarted()
{
base.OnApplicationStarted();
AreaRegistration.RegisterAllAreas();
RegisterRoutes(RouteTable.Routes);
}
protected void Application_AuthenticateRequest(Object sender,EventArgs e)
{
if (HttpContext.Current.User != null)
{
if (HttpContext.Current.User.Identity.IsAuthenticated)
{
if (HttpContext.Current.User.Identity is FormsIdentity)
{
var id = (FormsIdentity) HttpContext.Current.User.Identity;
var ticket = id.Ticket;
var authToken = ticket.UserData;
var authService = (IAuthenticationService)DependencyResolver.Current.GetService(typeof(IAuthenticationService));
var user = authService.GetUserForAuthToken(authToken);
if (user != null)
{
user.SetIdentity(HttpContext.Current.User.Identity);
HttpContext.Current.User = (IPrincipal) user;
}
}
}
}
}
}
希望能帮助到你！
