C# 4 and .NET 4

1236 ❘ ChaPTer 41 Asp.net feAtures
ProCSharp.Circle = function(color, scaleFactor, diameter) {
ProCSharp.Circle.initializeBase(this, [color, scaleFactor]);
this._diameter = diameter;
}
You define properties and methods in the same way as before:
ProCSharp.Circle.prototype = {
get_Diameter : function() {
return this._diameter;
},
set_Diameter : function(diameter) {
this._diameter = diameter;
},
get_Area : function() {
return Math.PI * Math.pow((this._diameter * this._scaleFactor) / 2, 2);
},
describe : function() {
var description = "This is a " + this._color + " circle with an area of "
+ this.get_Area();
alert(description);
}
}
When you register the class, you provide the base class type as a second parameter:
ProCSharp.Circle.registerClass('ProCSharp.Circle', ProCSharp.Shape);
You can implement interfaces by passing them as additional parameters, although, to keep things simple,
you won’t see details of that here.
Using User-Defined Types
After you have defined classes in this way, you can instantiate and use them with simple syntax.
For example:
var myCircle = new ProCSharp.Circle('red', 1.0, 4.4);
myCircle.describe();
This code would result in a JavaScript alert box, as shown in Figure 41-18.
figure 41-18
If you want to test this, run the PCSLibraryDemo project and click the Test OOP Functionality button.
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