WebForm版demo,模擬手機Usb接口充電

時間 2019-11-19

標籤 webform demo 模擬手機 usb接口充電简体版

原文原文鏈接

材料清單:Mobile(手機),MiniCharger(迷你充電器),IUsb(USB接口),html

設計思路:ide

1.聲明IUsb約定對象之間的交互方式,其中包含一個事件;函數

2.Mobile實現IUsb接口,這是關鍵點,是調用者實現接口,需求經過事件委託給充電設備自行處理;ui

3.Mobile反射充電設備,經過構造函數注入IUsb;this

代碼清單:spa

1 public interface IUsb {
2     decimal Voltage { get; set; }
3     event System.EventHandler Connecting;
4     }

IUsb.cs

 1 <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Mobile.aspx.cs" Inherits="Mobile" %>
 2 
 3 <!DOCTYPE html>
 4 
 5 <html xmlns="http://www.w3.org/1999/xhtml">
 6 <head runat="server">
 7 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
 8     <title></title>
 9 </head>
10 <body>
11     <form id="form1" runat="server">
12     <div>
13         <label>電壓:</label><asp:Label ID="lblVoltage" runat="server" Text="0" ></asp:Label>
14         <asp:Label ID="lblMessage" runat="server" Text="沒電了" ></asp:Label>
15         <asp:DropDownList ID="drpSelect" runat="server">
16             <asp:ListItem Text="迷你充電器" Value="MiniCharger"></asp:ListItem>
17             </asp:DropDownList>
18         <asp:Button ID="btnConnect" runat="server" Text="鏈接充電設備" OnClick="btnConnect_Click" />
19     </div>
20     </form>
21 </body>
22 </html>

Mobile.aspx

 1 using System;
 2 public partial class Mobile : System.Web.UI.Page, IUsb {
 3     public decimal Voltage { get; set; }
 4     public event EventHandler Connecting;
 5     protected const decimal Increment = 0.5m;
 6     protected const decimal Max = 5.0m;
 7 
 8     protected object LoadCharger(string pType) {
 9         string _fileName = "Z:\\" + pType + ".dll";
10         object[] _args = new object[] { this };
11         return System.Activator.CreateInstanceFrom(
12             _fileName, pType, true, 0, null, _args, null, null);
13         }
14 
15     protected void btnConnect_Click(object sender, EventArgs e) {
16         this.LoadCharger(this.drpSelect.SelectedItem.Value);
17         this.ShowMessage();
18         }
19 
20     protected void ShowMessage() {
21         if (this.Connecting == null) this.lblMessage.Text = "設備無響應";
22         else {
23             this.Connecting(null, EventArgs.Empty);
24             this.lblVoltage.Text = this.Voltage.ToString();
25             this.lblMessage.Text = (this.Voltage==0)?"設備無充電功能"
26                 : (this.Voltage == Max) ? "瞬間充滿" 
27                 :"充電中";
28             }
29         }
30 
31     }

Mobile.aspx.cs

 1 using System;
 2 [Serializable]
 3 public class MiniCharger {
 4     protected IUsb Usb { get; set; }
 5     protected const decimal Voltage = 5.0m;
 6     public MiniCharger(IUsb pElement) {
 7         this.Usb = pElement;
 8         this.Usb.Connecting += Element_Connecting;
 9         }
10 
11     void Element_Connecting(object sender, EventArgs e) {
12         this.Usb.Voltage = Voltage;
13         }
14     }