ASP.NET的适配器设计模式(Adapter)应用详解

Light.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
///

/// Summary description for Light
///

namespace Insus.NET
{
public class Light
{
private int _InputVoltage = 15;
public int InputVoltage
{
get { return _InputVoltage; }
set
{
if (value <15)
throw new Exception("电压过低。");
else if (value > 15)
throw new Exception("危险！电压过大灯烧坏。");
else
value = 15;
_InputVoltage = value;
}
}
public Light()
{
//
// TODO: Add constructor logic here
//
}
}
}

PowerAdapter.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
///

/// Summary description for PowerAdapter
///

namespace Insus.NET
{
public class PowerAdapter : Light
{
Light _Light;
public PowerAdapter(Light light)
{
this._Light = light;
}
public int InputVoltage
{
get
{
return _Light.InputVoltage;
}
set
{
if (value <15)
throw new Exception("电压过低。");
else if (value > 220)
throw new Exception("危险！电压过大电源适配器烧坏。");
else
value = 15;
_Light.InputVoltage = value;
}
}
}
}

Default.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

插座电压
开关
灯	Light 1	Light 2

Default.aspx.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Insus.NET;
public partial class _Default : System.Web.UI.Page
{
string offLight = "~/Images/Light_C.gif";
string onLight = "~/Images/Light_O.gif";
protected void Page_Load(object sender, EventArgs e)
{
}
protected void CheckBoxSwitch_CheckedChanged(object sender, EventArgs e)
{
var cb = (CheckBox)sender;
//插座缺少电压为220伏
int input = Convert.ToInt32(string.IsNullOrEmpty(this.TextBox1.Text.Trim()) ? "220" : this.TextBox1.Text.Trim());
//开关打开
if (cb.Checked)
{
try
{
//实例一个电灯
Light light = new Light();
//插入插座，使用插座电压
light.InputVoltage = input;
//电灯被打开
this.Image1.ImageUrl = onLight;
//显示正常输出电压
this.Label1.Text = light.InputVoltage.ToString();
}
catch (Exception ex)
{
//如果电压不正常，电灯打不开或是被烧坏。
this.Image1.ImageUrl = offLight;
//显示异常信息。
this.Label1.Text = ex.Message;
}
try
{
Light light = new Light();
//使用电源适配器
PowerAdapter pa = new PowerAdapter(light);
pa.InputVoltage = input;
this.Image2.ImageUrl = onLight;
this.Label2.Text = pa.InputVoltage.ToString();
}
catch (Exception ex)
{
this.Image2.ImageUrl = offLight;
this.Label2.Text = ex.Message;
}
this.TextBox1.Enabled = false;
}
//开关关闭
else
{
this.TextBox1.Text = string.Empty;
this.TextBox1.Enabled = true;
this.Image1.ImageUrl = offLight;
this.Image2.ImageUrl = offLight;
}
}
}