{"id":17,"date":"2010-04-27T13:07:29","date_gmt":"2010-04-27T11:07:29","guid":{"rendered":"http:\/\/blog.fh-kaernten.at\/wehr\/?p=17"},"modified":"2011-02-15T11:37:14","modified_gmt":"2011-02-15T10:37:14","slug":"ninject-the-first-contact","status":"publish","type":"post","link":"https:\/\/blog.fh-kaernten.at\/wehr\/2010\/04\/27\/ninject-the-first-contact\/","title":{"rendered":"Ninject, the first contact."},"content":{"rendered":"

\n

\"\"<\/p>\n

So what’s Ninject<\/a>.\u00a0 Ninject is a lightweight dependency injection framework for .NET applications. … and what is it good for (absolutely nothing?)? Ehm, not at all!<\/p>\n

The simplest use case would be following scenario:<\/p>\n

For example your design declares a singleton class. Normally you would code something like that:<\/p>\n

 public sealed class TheManager\r\n{\r\n    static TheManager instance=null;\r\n    static readonly object padlock = new object();\r\n\r\n    TheManager()\r\n    {\r\n    }\r\n\r\n    public static TheManager Instance\r\n    {\r\n        get\r\n        {\r\n            lock (padlock)\r\n            {\r\n                if (instance==null)\r\n                {\r\n                    instance = new TheManager();\r\n                }\r\n                return instance;\r\n            }\r\n        }\r\n    }\r\n}\r\n<\/pre>\n
Then you would get an instance of TheManager like that:<\/p>\n
 TheManager myManager = TheManager.Instance()\r\n<\/pre>\n
Okay, now we will use Ninject for our singleton pattern.
\n If you use Ninject you need not to add code for locking down your class to achieve a singleton behavior. You only have to tell Ninject that the class type should be tied to some implementation, in our example to itself. Furthermore, you have to setup\u00a0 the – what they call – Activation Behavior<\/em>. In our Example it is,….\u00a0 yes the InSingletonScope.<\/em><\/p>\n
Ninject <\/strong>distinguishes between 4 (build-in) scopes:<\/p>\n\n\n\n\n\n\n
Transient<\/td>\n.InTransientScope()<\/code><\/td>\nA new instance of the type will be created each time one is requested. (This is the default scope)<\/td>\n<\/tr>\n
Singleton<\/td>\n.InSingletonScope()<\/code><\/td>\nOnly a single instance of the type will be created, and the same instance will be returned for each subsequent request.<\/td>\n<\/tr>\n
Thread<\/td>\n.InThreadScope()<\/code><\/td>\nOne instance of the type will be created per thread.<\/td>\n<\/tr>\n
Request<\/td>\n.InRequestScope()<\/code><\/td>\nOne instance of the type will be created per web request, and will be destroyed when the request ends.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
The first step would be to create a new NinjectModule which will hold the bindings.<\/p>\n
public class MainModule : NinjectModule\r\n{\r\n public override void Load()\r\n {\r\n   Bind<TheManager>().ToSelf().InSingletonScope();\r\n }\r\n}\r\n<\/pre>\n
Our TheManager <\/strong>class <\/strong>looks like that:<\/p>\n
 public class TheManager\r\n{\r\n    public TheManager()\r\n    {\r\n\r\n    }\r\n    public  DoManage()\r\n    {\r\n        System.Console.WriteLine(\"Resistance is futile\");\r\n    }\r\n}<\/pre>\n
Now we can use our TheManager <\/strong>class as a singleton.<\/p>\n
The simplest use would be if you ask the Ninject kernel for the TheManager <\/strong>class<\/p>\n
 class Program\r\n  {\r\n    static void Main(string[] args)\r\n    {\r\n      IKernel kernel = new StandardKernel(new MainModule());\r\n      TheManager myManager = kernel.Get<TheManager>();\r\n    }\r\n}\r\n<\/pre>\n
Whenever you call the Ninject kernel for the TheManager<\/strong> type implementation you will <\/strong>get a reference to the same instance.<\/p>\n
But Ninjects magic can do a lot more cooler stuff for you.<\/p>\n
Let’s suppose you have another class TheBoss<\/strong> which should use TheManager<\/strong>. And you want that if you instantiate the <\/strong>TheBoss <\/strong>it should automatically have a TheManager.<\/strong><\/p>\n
Then you could use the [Inject]<\/strong> Attribut. Whenever you use this Attribut Ninject will search his binding “tables” for an implementation which suits to the request context respectively to the bindings.<\/p>\n
For example you can use the\u00a0 Property Injection<\/em> feature. Here we annotate the myManager <\/strong>property with [Inject]<\/strong> . So if we create an instance of\u00a0 TheBoss <\/strong>we also get myManager<\/strong> automatically resolved.<\/p>\n
 public class TheBoss\r\n{\r\n    [Inject]\r\n    TheManager myManager { get; set;}\r\n\r\n    public TheBoss()\r\n    {\r\n    }\r\n}\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"
So what’s Ninject.\u00a0 Ninject is a lightweight dependency injection framework for .NET applications. … and what is it good for (absolutely nothing?)? Ehm, not at all! The simplest use case would be following scenario: For example your design declares a singleton class. Normally you would code something like that: public sealed class TheManager { static … Continue reading Ninject, the first contact.<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"ngg_post_thumbnail":0,"footnotes":""},"categories":[4,3],"tags":[],"class_list":["post-17","post","type-post","status-publish","format-standard","hentry","category-net-stuff","category-programming"],"yoast_head":"\nNinject, the first contact. - Mario's TinyLab<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/blog.fh-kaernten.at\/wehr\/2010\/04\/27\/ninject-the-first-contact\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ninject, the first contact. - Mario's TinyLab\" \/>\n<meta property=\"og:description\" content=\"So what’s Ninject.\u00a0 Ninject is a lightweight dependency injection framework for .NET applications. … and what is it good for (absolutely nothing?)? 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