Dependency Injection C# Example

C# > Patterns > Dependency Injection 

Dependency injection promotes loose coupling of components by passing dependencies to an object rather than having an object instantiate its own dependencies.(http://www.blackwasp.co.uk/DependencyInjection.aspx)

• Autofac
• Autofac modules

       

Example

        public interface ITruck

        {

            void Go(double distance);

        }

        public class Truck : ITruck

        {

            public double Consumption{ get; set; }

            public void Go(double distance)

            {

                double necessary_fuel = Consumption * distance;

            }

        }

        public interface IRoute

        {

            void AddTruck(ITruck dependency);

        }

        public class Route : IRoute

        {

            ITruck _truck;

            public double Distance { get; set; }

            public void AddTruck(ITruck truck)

            {

                _truck = truck;

            }

            public void TruckGo()

            {

                _truck.Go(Distance);

            }

        }

            Route route = new Route();

            route.Distance = 100;

            Truck truck = new Truck();

            truck.Consumption = 20;

           

            route.AddTruck(truck);

            route.TruckGo();

C# System.Security AccessControl

C# > System.Security > AccessControl

With AccessControl you can control, access and audit security related actions on securable objects.

• AuthorizationRuleCollection 

C# > System.Security

C# > System.Security

• NET Framework security system
• provide access to authentication
• provide crytographic services
• control access to operations based on policy
• rights management of application-created content

Classes

• AccessControl

Dynamic Type C# Example

C# > Types > dynamic

The dynamic enables bypass compile-time type checking. These operations are resolved at run time. 

Example

dynamic dyn = 1;

object obj = 1;

var dyn_type = dyn.GetType(); // System.Int32

var obj_type = obj.GetType(); // System.Int32

dyn = dyn + 1; //Ok

obj = obj + 1; // Error    1      Operator '+' cannot be applied to operands of type 'object' and 'int'

Object Type C# Example

C# > Types > object

 You can assign values of any type to variables of type object. 

Example

object obj;

obj = 1; 

string type =  obj.GetType().Name; //Int32

   

obj = "string";

type = obj.GetType().Name; //String

Dns Get Host By Name C# Example

C# > System.Net > Dns

Retrieves information about a specific host from the Internet Domain Name System (DNS).

Example

  IPHostEntry hostInfo = Dns.GetHostByName("www.microsoft.com");

  string hostName = hostInfo.HostName;

  IPAddress[] addressList = hostInfo.AddressList;

  foreach (IPAddress ipAddress in addressList)

  {

              

  }

C# System.Net

C# > System.Net

Provides  programming interface for:

• network protocols
• cache policies
• e-mail
• network traffic data and network address information
• networking functionality

Classes:

• Dns

Namespaces

• NetworkInformation