ASP.NET Tutorial/Development/Class — различия между версиями
Admin (обсуждение | вклад) м (1 версия) |
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(нет различий)
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Версия 18:30, 26 мая 2010
Содержание
- 1 Abstract class
- 2 Assign value to class public fields (C#)
- 3 Assign value to class public field (VB)
- 4 Call calss constructor to create new object (C#)
- 5 Call class constructor to create new object (VB)
- 6 Create read-only properties
- 7 Creating Partial Classes
- 8 Declaring Constructors
- 9 Declaring Interfaces
- 10 Declaring Namespaces
- 11 Define and use class in asp.net page (C#)
- 12 Define and use class in asp.net page (VB)
- 13 Inheritance and Abstract Classes
- 14 Overloading is useful when you want to associate related methods.
- 15 Override a property or method of a base class
Abstract class
<source lang="csharp">
public abstract class BaseEmployee {
public abstract decimal Salary { get; } public string Company { get { return "Acme Software"; } }
} public class SalesEmployee : BaseEmployee {
public override decimal Salary { get { return 67000.23m; } }
}</source>
Assign value to class public fields (C#)
<source lang="csharp">
<%@ Page Language="C#" %> <script runat="server">
class Clock { public int Second; public int Minute; public int Hour; void SetTime(int intSec, int intMin, int intHour) { Second = intSec; Minute = intMin; Hour = intHour; } } void Page_Load(Object Sender, EventArgs e) { Clock objClock = new Clock(); objClock.Second = 60; Response.Write(objClock.Second); }
</script> <html><body>
</body></html></source>
Assign value to class public field (VB)
<source lang="csharp">
<%@ Page Language="VB" %> <script runat="server">
Class Clock public Second as integer public Minute as integer public Hour as integer sub SetTime(intSec as integer, intMin as integer, _ intHour as integer) Second = intSec Minute = intMin Hour = intHour end sub End Class sub Page_Load(Sender as object, e as EventArgs) dim objClock as new Clock objClock.Second = 60 Response.Write(objClock.Second) end sub
</script> <html><body>
</body></html></source>
Call calss constructor to create new object (C#)
<source lang="csharp">
<script language="C#" runat="server">
public class Clock { public int Second; public int Minute; public int Hour; public static int ClockCounter = 0; public static int AddClock(){ ClockCounter += 1; return ClockCounter; } public void SetTime(int intSec, int intMin, int intHour) { Second = intSec; Minute = intMin; Hour = intHour; } }
</script> <HTML> <BODY>
<% Clock objClock = new Clock(); objClock.SetTime(4,6,45); Clock.AddClock(); Response.Write(Clock.ClockCounter); %>
</BODY></HTML></source>
Call class constructor to create new object (VB)
<source lang="csharp">
<script language="VB" runat="server">
public class Clock public Second as integer public Minute as integer public Hour as integer public ClockCounter as integer = 0 public sub SetTime(intSec as integer, intMin as integer, _ intHour as integer) Second = intSec Minute = intMin Hour = intHour end sub end class
</script> <HTML> <BODY>
<% dim objClock as new Clock() objClock.SetTime(4,6,45) Response.Write(objClock.ClockCounter) %>
</BODY></HTML></source>
Create read-only properties
<source lang="csharp">
File: ServerTime.cs using System;
public class ServerTime {
public string CurrentTime { get { return DateTime.Now.ToString(); } }
}</source>
Creating Partial Classes
<source lang="csharp">
File: FirstHalf.cs public partial class Tweedle {
private string _message = @"fir";
}
File: SecondHalf.cs public partial class Tweedle {
public string GetMessage() { return _message; }
}</source>
Declaring Constructors
<source lang="csharp">
A constructor is called when you create a new instance of a class. File: Quote.cs using System; using System.Collections.Generic; public class Quote {
private List<string> _quotes = new List<string>(); public string GetQuote() { Random rnd = new Random(); return _quotes[rnd.Next(_quotes.Count)]; } public Quote() { _quotes.Add("A"); _quotes.Add("B"); _quotes.Add("C"); }
}</source>
Declaring Interfaces
<source lang="csharp">
An interface is a list of properties and methods that a class must implement. public interface IProduct {
decimal Price { get; } void SaveProduct();
} public class MusicProduct : IProduct {
public decimal Price { get { return 12.99m; } } public void SaveProduct() { // Save Music Product }
} public class BookProduct : IProduct {
public decimal Price { get { return 23.99m; } } public void SaveProduct() { // Save Book Product }
}</source>
Declaring Namespaces
<source lang="csharp">
A namespace enables you to group related classes. Namespaced.cs namespace AspNetUnleashed.SampleCode {
public class Namespaced { public string SaySomething() { return "Something"; } }
}</source>
Define and use class in asp.net page (C#)
<source lang="csharp">
<%@ Page Language="C#" %> <script runat="server">
class MyValueClass { public DateTime dtBirthDay = new DateTime(1999,6,27); public string GetDayOfWeek() { return(dtBirthDay.DayOfWeek.ToString()); } } void Button_Click(Object Sender, EventArgs e) { MyValueClass objMyValueClass = new MyValueClass(); Response.Write(objMyValueClass.GetDayOfWeek()); }
</script> <html><body>
<form runat="server"> <asp:button id="btSubmit" Text="Submit" runat=server OnClick="Button_Click"/> </form>
</body></html></source>
Define and use class in asp.net page (VB)
<source lang="csharp">
<%@ Page Language="VB" %> <script runat="server">
class MyValueClass public dtBirthDay as new DateTime(1983,6,27) function GetDayOfWeek() as String return dtBirthDay.DayOfWeek.ToString() end function end class sub Button_Click(Sender as Object, e as EventArgs) dim objMyValueClass as new MyValueClass() Response.Write(objMyValueClass.GetDayOfWeek()) end sub
</script> <html> <body>
<form runat="server"> <asp:button id="btSubmit" Text="Submit" runat=server OnClick="Button_Click"/> </form>
</body> </html></source>
Inheritance and Abstract Classes
<source lang="csharp">
public class BaseProduct {
private decimal _price; public decimal Price { get { return _price; } set { _price = value; } }
} public class ComputerProduct : BaseProduct {
private string _processor; public string Processor { get { return _processor; } set { _processor = value; } }
} public class TelevisionProduct : BaseProduct {
private bool _isHDTV; public bool IsHDTV { get { return _isHDTV; } set { _isHDTV = value; } }
}</source>
<source lang="csharp">
using System;
public class StoreProduct {
public void SaveProduct(string name) { SaveProduct(name, 0, String.Empty); } public void SaveProduct(string name, decimal price) { SaveProduct(name, price, String.Empty); } public void SaveProduct(string name, decimal price, string description) { // Save name, price, description to database }
}
File: ProductConstructor.cs using System;
public class ProductConstructor {
public ProductConstructor(string name) : this(name, 0, String.Empty) { } public ProductConstructor(string name, decimal price) : this(name, price, String.Empty) { } public ProductConstructor(string name, decimal price, string description) { // Use name, price, and description }
}</source>
Override a property or method of a base class
<source lang="csharp">
public class ProductBase {
private decimal _price; public virtual decimal Price { get { return _price; } set { _price = value; } }
} public class OnSaleProduct : ProductBase {
override public decimal Price { get { return base.Price / 2; } set { base.Price = value; } }
}</source>