в 15:31, 26 мая 2010

2010-05-26T15:31:53Z

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2010-05-26T12:16:04Z

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==Public vs private access==

<p>It is OK for a member of a class to access a private member of the same class.</p>

<source lang="csharp">using System;

class MyClass {
private int a; // private access explicitly specified
int b; // private access by default
public int gamma; // public access

public void setAlpha(int val) {
a = val;
}

public int getAlpha() {
return a;
}

public void setBeta(int a) {
b = a;
}

public int getBeta() {
return b;
}
}

class AccessDemo {
public static void Main() {
MyClass ob = new MyClass();

/* Access to a and b is allowed only through methods. */
ob.setAlpha(-99);
ob.setBeta(19);
Console.WriteLine("ob.a is " + ob.getAlpha());
Console.WriteLine("ob.b is " + ob.getBeta());

// You cannot access a or b like this:
// ob.a = 10; // Wrong! a is private!
// ob.b = 9; // Wrong! b is private!

// It is OK to directly access gamma because it is public.
ob.gamma = 99;
}
}</source>
<pre class=codeResult>ob.a is -99
ob.b is 19</pre>

==Re-using Base Class Identifiers==

<source lang="csharp">class Point2D
{
public int X;
public int Y;
}

class Point3D : Point2D
{
public int X;
public int Y;
public int Z;
}

class MyMainClass
{
public static void Main()
{
Point2D My2DPoint = new Point2D();
Point3D My3DPoint = new Point3D();

My2DPoint.X = 100;
My2DPoint.Y = 200;

My3DPoint.X = 150;
My3DPoint.Y = 250;
My3DPoint.Z = 350;
}
}</source>

==Use an access modifier with an accessor==

<source lang="csharp">using System;

class MySequence {
int prop;

public MySequence() { prop = 0; }

public int MyProp {
get {
return prop;
}
private set { // private
prop = value;
}
}

public void increaseSequence() {
MyProp++;
}
}

class MainClass {
public static void Main() {
MySequence ob = new MySequence();

Console.WriteLine("Original value of ob.MyProp: " + ob.MyProp);

ob.increaseSequence();
Console.WriteLine("Value of ob.MyProp after increment: "
+ ob.MyProp);
}
}</source>
<pre class=codeResult>Original value of ob.MyProp: 0
Value of ob.MyProp after increment: 1</pre>

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в 15:31, 26 мая 2010

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