di injection

MySolution/ConsoleApp/Samples/DISample.cs

@@ -0,0 +1,58 @@
+namespace Samples.DI
+{
+    class DISample
+    {
+        public static void Sample()
+        {
+            DIContainer container = new DIContainer();
+            container.Register<IService, Service>();
+            
+            Client client = new Client(container.Resolve<IService>());
+            client.Run();
+        }
+    }
+
+    public interface IService
+    {
+        void DoSomething();
+    }
+
+    public class Service : IService
+    {
+        public void DoSomething()
+        {
+            Console.WriteLine("Service is doing something...");
+        }
+    }
+
+    public class Client
+    {
+        private readonly IService _service;
+
+        public Client(IService service)
+        {
+            _service = service;
+        }
+
+        public void Run()
+        {
+            _service.DoSomething();
+        }
+    }
+
+    public class DIContainer
+    {
+        private readonly Dictionary<Type, Type> _typemappings = new Dictionary<Type, Type>();
+
+        public void Register<TInterface, TImplementation>()
+        {
+            _typemappings[typeof(TInterface)] = typeof(TImplementation);
+        }
+
+        public TInterface Resolve<TInterface>()
+        {
+            Type implementationType = _typemappings[typeof(TInterface)];
+            return (TInterface)Activator.CreateInstance(implementationType);
+        }
+    }
+}