illustrates casting an object to an interface : Interface « Class Interface « C# / C Sharp

Home C# / C Sharp 1. 2D Graphics 2. Class Interface 3. Collections Data Structure 4. Components 5. Data Types 6. Database ADO.net 7. Date Time 8. Design Patterns 9. Development Class 10. Event 11. File Stream 12. Generics 13. GUI Windows Form 14. Internationalization I18N 15. Language Basics 16. LINQ 17. Network 18. Office 19. Reflection 20. Regular Expressions 21. Security 22. Services Event 23. Thread 24. Web Services 25. Windows 26. Windows Presentation Foundation 27. XML 28. XML LINQ

C# / C Sharp » Class Interface » Interface Screenshots  illustrates casting an object to an interface /* Mastering Visual C# .NET by Jason Price, Mike Gunderloy Publisher: Sybex; ISBN: 0782129110 */ /*   Example8_4.cs illustrates casting an object   to an interface */ using System; // define the IDrivable interface interface IDrivable {   // method declarations   void Start();   void Stop();   // property declaration   bool Started   {     get;   } } // Car class implements the IDrivable interface class Car : IDrivable {   // declare the underlying field used by the Started property   private bool started = false;   // implement the Start() method   public void Start()   {     Console.WriteLine("car started");     started = true;   }   // implement the Stop() method   public void Stop()   {     Console.WriteLine("car stopped");     started = false;   }   // implement the Started property   public bool Started   {     get     {       return started;     }   }    } public class Example8_4 {   public static void Main()   {     // create a Car object     Car myCar = new Car();     // use the is operator to check that myCar supports the     // IDrivable interface     if (myCar is IDrivable)     {       Console.WriteLine("myCar supports IDrivable");     }     // cast the Car object to IDrivable     IDrivable myDrivable = (IDrivable) myCar;     // call myDrivable.Start()     Console.WriteLine("Calling myDrivable.Start()");     myDrivable.Start();     Console.WriteLine("myDrivable.Started = " +       myDrivable.Started);     // call myDrivable.Stop()     Console.WriteLine("Calling myDrivable.Stop()");     myDrivable.Stop();     Console.WriteLine("myDrivable.Started = " +       myDrivable.Started);     // cast the Car object to IDrivable using the as operator     IDrivable myDrivable2 = myCar as IDrivable;     if (myDrivable2 != null)     {       Console.WriteLine("Calling myDrivable2.Start()");       myDrivable2.Start();       Console.WriteLine("Calling myDrivable2.Stop()");       myDrivable2.Stop();       Console.WriteLine("myDrivable2.Started = " +         myDrivable2.Started);     }   } }                     Related examples in the same category 1. Interface with method name conflicts 2. Demonstrate the ByTwos interface 3. Demonstrate the ByTwos interface 2 4. Use a property in an interface 5. Add an indexer in an interface 6. One interface can inherit another 7. Explicitly implement an interface member 8. Use explicit implementation to remove ambiguity 9. Two class inherit one interface 10. Using interface 3 11. illustrates interfaces 12. illustrates implementing multiple interfaces 13. illustrates inheriting from a class and implementing multiple interfaces 14. illustrates deriving an interface from one interface 15. illustrates deriving an interface from multiple interfaces 16. illustrates an explicit interface member implementation 17. illustrates interface member hiding 18. Demonstrates the use of a simple interface 19. Interface demo 20. Interface demo: implements two interfaces 21. Interface casting 22. Overriding Interfaces 23. Overriding Interfaces: Tester Overriding InterfacesAs 24. A safe method of determining whether a class implements a particular interface 25. Interfaces:Working with Interfaces 26. Reimplementation of Interfaces 27. Interface with event