Anonymous function

 class Program  
   {  
     static void Main(string[] args)  
     {  
       Func<int, int> func1 = x => x + 1;  
       Func<int, int> func2 = x => { return x + 1; };  
       Func<int, int> func3 = (int x) => x + 1;  
       Func<int, int> func4 = (int x) => { return x + 1; };  
       Func<int, int, int> func5 = (x, y) => x * y;  
       Action func6 = () => Console.WriteLine();  
       Func<int, int> func7 = delegate (int x) { return x + 1; };  
       Func<int> func8 = delegate { return 1 + 1; };  
       Console.WriteLine(func1.Invoke(1));  
       Console.WriteLine(func2.Invoke(1));  
       Console.WriteLine(func3.Invoke(1));  
       Console.WriteLine(func4.Invoke(1));  
       Console.WriteLine(func5.Invoke(2, 2));  
       func6.Invoke();  
       Console.WriteLine(func7.Invoke(1));  
       Console.WriteLine(func8.Invoke());  
       Console.ReadLine();  
     }  

Basic Dependency Injection control

I found a simple Inversion Controller on https://timross.wordpress.com/2010/01/21/creating-a-simple-ioc-container

   

public interface IContainer  
   {  
     void Register<TTypeToResolve, TConcrete>();  
     void Register<TTypeToResolve, TConcrete>(LifeCycle lifeCycle);  
     TTypeToResolve Resolve<TTypeToResolve>();  
     object Resolve(Type typeToResolve);  
   }  
   public enum LifeCycle   
   {   
    Singleton,   
    Transient   
   }   
   public class RegisteredObject  
   {  
     public RegisteredObject(Type typeToResolve, Type concreteType, LifeCycle lifeCycle)  
     {  
       TypeToResolve = typeToResolve;  
       ConcreteType = concreteType;  
       LifeCycle = lifeCycle;  
     }  
     public Type TypeToResolve { get; private set; }  
     public Type ConcreteType { get; private set; }  
     public object Instance { get; private set; }  
     public LifeCycle LifeCycle { get; private set; }  
     public void CreateInstance(params object[] args)  
     {  
       this.Instance = Activator.CreateInstance(this.ConcreteType, args);  
     }  
   }  
   public class SimpleIocContainer : IContainer  
   {  
     private readonly IList<RegisteredObject> registeredObjects = new List<RegisteredObject>();  
     public void Register<TTypeToResolve, TConcrete>()  
     {  
       Register<TTypeToResolve, TConcrete>(LifeCycle.Singleton);  
     }  
     public void Register<TTypeToResolve, TConcrete>(LifeCycle lifeCycle)  
     {  
       registeredObjects.Add(new RegisteredObject(typeof (TTypeToResolve), typeof (TConcrete), lifeCycle));  
     }  
     public TTypeToResolve Resolve<TTypeToResolve>()  
     {  
       return (TTypeToResolve) ResolveObject(typeof (TTypeToResolve));  
     }  
     public object Resolve(Type typeToResolve)  
     {  
       return ResolveObject(typeToResolve);  
     }  
     private object ResolveObject(Type typeToResolve)  
     {  
       var registeredObject = registeredObjects.FirstOrDefault(o => o.TypeToResolve == typeToResolve);  
       if (registeredObject == null)  
       {  
         throw new TypeNotRegisteredException(string.Format(  
           "The type {0} has not been registered", typeToResolve.Name));  
       }  
       return GetInstance(registeredObject);  
     }  
     private object GetInstance(RegisteredObject registeredObject)  
     {  
       if (registeredObject.Instance == null ||   
         registeredObject.LifeCycle == LifeCycle.Transient)  
       {  
         var parameters = ResolveConstructorParameters(registeredObject);  
         registeredObject.CreateInstance(parameters.ToArray());  
       }  
       return registeredObject.Instance;  
     }  
     private IEnumerable<object> ResolveConstructorParameters(RegisteredObject registeredObject)  
     {  
       var constructorInfo = registeredObject.ConcreteType.GetConstructors().First();  
       foreach (var parameter in constructorInfo.GetParameters())  
       {  
         yield return ResolveObject(parameter.ParameterType);  
       }  
     }  
   }  
   public class TypeNotRegisteredException : Exception  
   {  
     public TypeNotRegisteredException(string message)  
       : base(message)  
     {  
     }  
   }