ASP.Net/Language Basics/Class Definition — различия между версиями
Admin (обсуждение | вклад) м (1 версия) |
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Версия 15:30, 26 мая 2010
Содержание
Constructor with parameter (C#)
<%@ page Language="c#" runat="server" %>
<script runat="server">
public class Book
{
private string title;
private int isbn;
private decimal price;
public Book(string newTitle, int newIsbn)
{
title = newTitle;
isbn = newIsbn;
}
public string TitleInfo
{
get
{
return title + " <i>[ISBN: " + isbn + "]</i>";
}
}
public string Title
{
get
{
return title;
}
}
public int Isbn
{
get
{
return isbn;
}
}
public decimal Price
{
get
{
return price;
}
set
{
price = value;
}
}
}
void Page_Load()
{
Book MyBook = new Book("Beginning ASP.NET 1.0 with C#", 1861007345);
Response.Write("<b>new book "MyBook" created.</b>");
MyBook.Price = 39.99m;
Response.Write("<br/>Title info: " + MyBook.TitleInfo);
Response.Write("<br/>Price: $" + MyBook.Price + "<br/>");
Book AnotherBook = new Book("Professional ASP.NET 1.0 SE", 1861007035);
Response.Write("<b>new book "AnotherBook" created.</b>");
AnotherBook.Price = 59.99m;
Response.Write("<br/>Title info: " + AnotherBook.TitleInfo);
Response.Write("<br/>Price: $" + AnotherBook.Price + "<br/>");
}
</script>
Define a class and display its value (C#)
<%@ Page Language="C#" %>
<script runat="server">
public class Person
{
private string _Name;
private int _Age;
private string _EyeColor;
public Person() {
}
public string Name {
get {
return _Name;
}
set {
_Name = value;
}
}
public int Age {
get {
return _Age;
}
set {
_Age = value;
}
}
public string EyeColor {
get {
return _EyeColor;
}
set {
_EyeColor = value;
}
}
}
void Page_Load(object Sender, EventArgs E) {
Person p = new Person();
p.Name = "Joe";
p.Age = 25;
p.EyeColor = "Blue";
Name.Text = p.Name;
Age.Text = p.Age.ToString();
EyeColor.Text = p.EyeColor;
}
</script>
<html>
<head>
</head>
<body>
<form runat="server">
Name: <asp:Label runat="server" id="Name" /><br />
Age: <asp:Label runat="server" id="Age" /><br />
Eye Color: <asp:Label runat="server" id="EyeColor" />
</form>
</body>
</html>
Define and use class: property (C#)
<%@ page Language="c#" runat="server" %>
<script runat="server">
public class Book
{
private string title;
private int isbn;
private decimal price;
public Book()
{
title = "Book";
isbn = 099999999999;
}
public string TitleInfo
{
get
{
return title + " <i>[ISBN: " + isbn + "]</i>";
}
}
public string Title
{
get
{
return title;
}
}
public int Isbn
{
get
{
return isbn;
}
}
public decimal Price
{
get
{
return price;
}
set
{
price = value;
}
}
}
void Page_Load()
{
Book MyBook = new Book();
Response.Write("<b>new book "MyBook" created.</b>");
MyBook.Price = 39.99m;
Response.Write("<br/>Title info: " + MyBook.TitleInfo);
Response.Write("<br/>Price: $" + MyBook.Price + "<br/>");
}
</script>
Define two classes (C#)
<%@ page language="C#" runat="server" Debug="true"%>
<script runat="server">
public class Key
{
private int shape;
public Key(int newshape)
{
shape = newshape;
}
public int Shape
{
get
{
return shape;
}
}
}
public class Car
{
private string color;
private int gear;
private int ignition;
private bool engineRunning;
private static int count = 0;
public Car(int IgnitionShape)
{
color = "Cold gray steel";
ignition = IgnitionShape;
count += 1;
}
public static int Count
{
get
{
return count;
}
}
public string Color
{
get
{
return color;
}
set
{
color = value;
}
}
public int Gear
{
get
{
return gear;
}
}
public string IsRunning
{
get
{
if (engineRunning)
{
return "The engine is running.";
}
else
{
return "The engine is not running.";
}
}
}
public void ChangeGear(int direction)
{
if (direction < 0) gear -= 1;
if (direction > 0) gear += 1;
if (gear > 5) gear = 5;
if (gear < -1) gear = -1;
}
public void ChangeGear(string direction)
{
if (direction == "down")
{
ChangeGear(-1);
}
if (direction == "up")
{
ChangeGear(+1);
}
}
public void Ignition(Key IgnitionKey)
{
if (IgnitionKey.Shape == ignition) engineRunning = true;
}
public void EngineOff()
{
engineRunning = false;
}
}
public void Page_Load()
{
Key AlexKey = new Key(0987654321);
Key RobKey = new Key(1861005040);
Key MyKey = new Key(1234567890);
Car MyCar = new Car(1234567890);
Response.Write("<b>New object "MyCar" created.</b>");
Response.Write("<br/>Color: " + MyCar.Color);
Response.Write("<br/>Gear: " + MyCar.Gear);
MyCar.Color = "Black";
MyCar.ChangeGear(+1);
Response.Write("<br/><b>Properties updated.</b>");
Response.Write("<br/>New color: " + MyCar.Color);
Response.Write("<br/>New gear: " + MyCar.Gear);
MyCar.ChangeGear("up");
Response.Write("<br/><b>Shifted "up" one gear.</b>");
Response.Write("<br/>New gear: " + MyCar.Gear);
Response.Write("<hr/>Attempting to start MyCar with AlexKey: ");
MyCar.Ignition(AlexKey);
Response.Write(MyCar.IsRunning);
Response.Write("<hr/>Attempting to start MyCar with RobKey: ");
MyCar.Ignition(RobKey);
Response.Write(MyCar.IsRunning);
Response.Write("<hr/>Attempting to start MyCar with MyKey: ");
MyCar.Ignition(MyKey);
Response.Write(MyCar.IsRunning);
Response.Write("<br/>Attempting to stop MyCar: ");
MyCar.EngineOff();
Response.Write(MyCar.IsRunning);
}
</script>