в 15:31, 26 мая 2010

2010-05-26T15:31:53Z

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2010-05-26T12:16:03Z

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==Add constructors to base class==

<source lang="csharp">using System;

class Shape {
double pri_width; // private
double pri_height; // private

public Shape(double w, double h) {
width = w;
height = h;
}

// properties for width and height.
public double width {
get { return pri_width; }
set { pri_width = value; }
}

public double height {
get { return pri_height; }
set { pri_height = value; }
}

public void showDim() {
Console.WriteLine("Width and height are " +
width + " and " + height);
}
}

class Triangle : Shape {
string style; // private

public Triangle(string s, double w, double h) : base(w, h) {
style = s;
}

// Return area of triangle.
public double area() {
return width * height / 2;
}

// Display a triangle"s style.
public void showStyle() {
Console.WriteLine("Triangle is " + style);
}
}

class MainClass {
public static void Main() {
Triangle t1 = new Triangle("isosceles", 4.0, 4.0);
Triangle t2 = new Triangle("right", 8.0, 12.0);

Console.WriteLine("Info for t1: ");
t1.showStyle();
t1.showDim();
Console.WriteLine("Area is " + t1.area());

Console.WriteLine();

Console.WriteLine("Info for t2: ");
t2.showStyle();
t2.showDim();
Console.WriteLine("Area is " + t2.area());
}
}</source>
<pre class=codeResult>Info for t1:
Triangle is isosceles
Width and height are 4 and 4
Area is 8
Info for t2:
Triangle is right
Width and height are 8 and 12
Area is 48</pre>

==Add more constructors to base class==

<source lang="csharp">using System;

class Shape {
double pri_width; // private
double pri_height; // private

public Shape() {
width = height = 0.0;
}

// Constructor for Shape.
public Shape(double w, double h) {
width = w;
height = h;
}

// Construct object with equal width and height.
public Shape(double x) {
width = height = x;
}

// Properties for width and height.
public double width {
get { return pri_width; }
set { pri_width = value; }
}

public double height {
get { return pri_height; }
set { pri_height = value; }
}

public void showDim() {
Console.WriteLine("Width and height are " +
width + " and " + height);
}
}

// A derived class of Shape for triangles.
class Triangle : Shape {
string style; // private

/* A default constructor. This automatically invokes
the default constructor of Shape. */
public Triangle() {
style = "null";
}

// Constructor that takes three arguments.
public Triangle(string s, double w, double h) : base(w, h) {
style = s;
}

// Construct an isosceles triangle.
public Triangle(double x) : base(x) {
style = "isosceles";
}

// Return area of triangle.
public double area() {
return width * height / 2;
}

// Display a triangle"s style.
public void showStyle() {
Console.WriteLine("Triangle is " + style);
}
}

class MainClass {
public static void Main() {
Triangle t1 = new Triangle();
Triangle t2 = new Triangle("right", 8.0, 12.0);
Triangle t3 = new Triangle(4.0);

t1 = t2;

Console.WriteLine("Info for t1: ");
t1.showStyle();
t1.showDim();
Console.WriteLine("Area is " + t1.area());

Console.WriteLine();

Console.WriteLine("Info for t2: ");
t2.showStyle();
t2.showDim();
Console.WriteLine("Area is " + t2.area());

Console.WriteLine();

Console.WriteLine("Info for t3: ");
t3.showStyle();
t3.showDim();
Console.WriteLine("Area is " + t3.area());

Console.WriteLine();
}
}</source>
<pre class=codeResult>Info for t1:
Triangle is right
Width and height are 8 and 12
Area is 48
Info for t2:
Triangle is right
Width and height are 8 and 12
Area is 48
Info for t3:
Triangle is isosceles
Width and height are 4 and 4
Area is 8</pre>

==Call constructor in base class==

<source lang="csharp">using System;
public class BaseClass
{
public BaseClass(int x)
{
this.x = x;
}
public int X
{
get
{
return(x);
}
}
int x;
}
public class Derived: BaseClass
{
public Derived(int x): base(x)
{
}
}
class MainClass
{
public static void Main()
{
Derived d = new Derived(15);
Console.WriteLine("X = {0}", d.X);
}
}</source>
<pre class=codeResult>X = 15</pre>

==Define base class another cs file==

<source lang="csharp">//File: base.cs
using System;

namespace BaseClassNS
{
public class MyBaseClass
{
public void PrintMe()
{
Console.WriteLine("I am MyBaseClass");
}
}
}
//////////////////////////////////////
//MainClass.cs
using System;
using BaseClassNS;
namespace UsesBaseClass
{
class DerivedClass : MyBaseClass
{
}
class MainClass
{
static void Main()
{
DerivedClass mdc = new DerivedClass();
mdc.PrintMe();
}
}
}</source>

==Pass a derived class reference to a base class reference.==

<source lang="csharp">using System;

class Shape {
double pri_width; // private
double pri_height; // private

public Shape() {
width = height = 0.0;
}

public Shape(double w, double h) {
width = w;
height = h;
}

public Shape(double x) {
width = height = x;
}

public Shape(Shape ob) {
width = ob.width;
height = ob.height;
}

public double width {
get { return pri_width; }
set { pri_width = value; }
}

public double height {
get { return pri_height; }
set { pri_height = value; }
}

public void showDim() {
Console.WriteLine("Width and height are " +
width + " and " + height);
}
}

class Triangle : Shape {
string style; // private

// A default constructor.
public Triangle() {
style = "null";
}

// Constructor for Triangle.
public Triangle(string s, double w, double h) : base(w, h) {
style = s;
}

// Construct an isosceles triangle.
public Triangle(double x) : base(x) {
style = "isosceles";
}

// Construct an object from an object.
public Triangle(Triangle ob) : base(ob) {
style = ob.style;
}

// Return area of triangle.
public double area() {
return width * height / 2;
}

// Display a triangle"s style.
public void showStyle() {
Console.WriteLine("Triangle is " + style);
}
}

class MainClass {
public static void Main() {
Triangle t1 = new Triangle("right", 8.0, 12.0);

// make a copy of t1
Triangle t2 = new Triangle(t1);

Console.WriteLine("Info for t1: ");
t1.showStyle();
t1.showDim();
Console.WriteLine("Area is " + t1.area());

Console.WriteLine();

Console.WriteLine("Info for t2: ");
t2.showStyle();
t2.showDim();
Console.WriteLine("Area is " + t2.area());
}
}</source>
<pre class=codeResult>Info for t1:
Triangle is right
Width and height are 8 and 12
Area is 48
Info for t2:
Triangle is right
Width and height are 8 and 12
Area is 48</pre>

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Csharp/CSharp Tutorial/Class/Base Class - История изменений

в 15:31, 26 мая 2010

Admin: 1 версия