Interfaces:Working with Interfaces


/*
A Programmer's Introduction to C# (Second Edition)
by Eric Gunnerson

Publisher: Apress  L.P.
ISBN: 1-893115-62-3
*/

// 10 - Interfaces\Working with Interfaces
// copyright 2000 Eric Gunnerson
using System;

public class WorkingwithInterfaces
{
    public static void Main()
    {
        DiagramObject[] dArray = new DiagramObject[100];
        
        dArray[0] = new DiagramObject();
        dArray[1] = new TextObject("Text Dude");
        dArray[2] = new TextObject("Text Backup");
        
        // array gets initialized here, with classes that
        // derive from DiagramObject. Some of them implement
        // IScalable.
        
        foreach (DiagramObject d in dArray)
        {
            if (d is IScalable)
            {
                IScalable scalable = (IScalable) d;
                scalable.ScaleX(0.1F);
                scalable.ScaleY(10.0F);
            }
        }
    }
}

interface IScalable
{
    void ScaleX(float factor);
    void ScaleY(float factor);
}
public class DiagramObject
{
    public DiagramObject() {}
}
public class TextObject: DiagramObject, IScalable
{
    public TextObject(string text)
    {
        this.text = text;
    }
    // implementing IScalable.ScaleX()
    public void ScaleX(float factor)
    {
        Console.WriteLine("ScaleX: {0} {1}", text, factor);
        // scale the object here.
    }
    
    // implementing IScalable.ScaleY()
    public void ScaleY(float factor)
    {
        Console.WriteLine("ScaleY: {0} {1}", text, factor);
        // scale the object here.
    }
    
    private string text;
}

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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 casting an object to an interface
15.	illustrates deriving an interface from one interface
16.	illustrates deriving an interface from multiple interfaces
17.	illustrates an explicit interface member implementation
18.	illustrates interface member hiding
19.	Demonstrates the use of a simple interface
20.	Interface demo
21.	Interface demo: implements two interfaces
22.	Interface casting
23.	Overriding Interfaces
24.	Overriding Interfaces: Tester Overriding InterfacesAs
25.	A safe method of determining whether a class implements a particular interface
26.	Reimplementation of Interfaces
27.	Interface with event

Interfaces:Working with Interfaces : Interface « Class Interface « C# / C Sharp

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