Use interface as reference : Object Reference « Class « C# / CSharp Tutorial

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C# / CSharp Tutorial » Class » Object Reference 
7.3.14.Use interface as reference
using System;

interface Interface1
{
   void PrintOut(string s);
}

class MyClass : Interface1
{
   public void PrintOut(string s)
   {
      Console.WriteLine("Calling through: {0}", s);
   }
}

class MainClass
{
   static void Main()
   {
      MyClass mc = new MyClass();         
      mc.PrintOut("object.");             

      Interface1 ifc = (Interface1)mc;    
      ifc.PrintOut("interface.");         
   }
}
 
Calling through: object.
Calling through: interface.
7.3.Object Reference
7.3.1.Declare class fields and methods
7.3.2.Declare a House object reference named myHouse
7.3.3.Creating a House object and assigning its memory location to myHouse
7.3.4.Assign values to the House object's fields using object renerence
7.3.5.Display the field values using object reference
7.3.6.Declare another House object reference and create another House object
7.3.7.Change the object referenced by the myHouse object reference to the object referenced by yourHouse
7.3.8.Reference type equals: complex number
7.3.9.Reference equals
7.3.10.Reference a static member function without using the class name
7.3.11.Overridden Equals()
7.3.12.Reference an object by interface and class
7.3.13.Pass reference type variable without 'out' and 'ref'
7.3.14.Use interface as reference
7.3.15.Reference one object by multiple interfaces
7.3.16.Class comparison
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