/*
C# Programming Tips & Techniques
by Charles Wright, Kris Jamsa
Publisher: Osborne/McGraw-Hill (December 28, 2001)
ISBN: 0072193794
*/
//
// Abstract.cs -- Demonsrates the use of an abstract property.
//
// Compile this program with the following command line:
// C:>csc Abstract.cs
//
namespace nsAbstract
{
using System;
using System.Runtime.InteropServices;
public class AbstractPro
{
static public void Main ()
{
Console.WriteLine (clsAbstract.StaticMethod());
}
}
//
// To use the abstract modifier on a method, the class also must
// be declared as abastract
abstract class clsAbstract
{
//
// To declare an abstract method, end the declaration with a semicolon.
// Do not provide a body for the method.
abstract public int AbstractMethod();
//
// An abstract class may contain a static method. You do not have
// to declare an instance of the class to access a static method
static public double StaticMethod()
{
return (3.14159 * 3.14159);
}
abstract public long Prop
{
get;
set;
}
}
//
// Inherit from the abstract class. The following class implements
// the AbstractMethod().
// The access level of the derived class method must be the same
// as the access level of the base class abstract method.
class clsDerivedFromAbstract : clsAbstract
{
override public int AbstractMethod()
{
return (0);
}
override public long Prop
{
get
{
return (val);
}
set
{
val = value;
}
}
private long val;
}
}
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