資源簡介
銀行系統：
1）程序中使用事件及委托。參照視頻中提到的“六步法”，在ATM類中實現一個事件BigMoneyFetched (一大筆錢被取走了），即ATM機在操作時如果用戶取款數大于10000，則可以激活這個事件。事件參數也是一個對象（可以定義類BigMoneyArgs)，含有賬號及當時取款數。在程序中（如Main中）注冊這個事件，使之能在界面中顯示出告警信息（相當于銀行的監控功能）。
2）程序中使用自定義異常。比如，定義一個異常類BadCashException，表示有壞的鈔票。在程序中適當的地方（如取款函數）中，拋出(throw)(自定義的異常類（如random的Next(3)小于1，表示有三個之一的概率時就拋出），在ATM調用這個函數時進行捕獲(catch)。
代碼片段和文件信息
using?System;
using?System.Collections.Generic;
using?System.ComponentModel;
using?System.Data;
using?System.Drawing;
using?System.Linq;
using?System;
using?System.Windows.Forms;
namespace?ATM
{
????public?partial?class?Form1?:?Form
????{
????????public?static?Account?a?=?new?Account（）;
????????public?static?CreditAccount?ca?=?new?CreditAccount（）;
????????public?Form1（）
????????{
????????????InitializeComponent（）;
????????}
????????public?static?string?name?pass;
????????private?string?login_input_ID?login_input_pass;
????????private?void?Form1_Load（object?sender?EventArgs?e）
????????{
????????}
????????private?void?button3_Click（object?sender?EventArgs?e）
????????{
????????????if?（!String.IsNullOrEmpty（login_input_ID）?&&?!String.IsNullOrEmpty（login_input_pass））
????????????{
????????????????Form3?f3?=?new?Form3（）;
???????????????
????????????????if?（login_input_ID?==?a[0]?&&?login_input_pass?==?a.password）
????????????????????f3.Show（）;
????????????????else
????????????????????MessageBox.Show（“wrong?ID?or?password.“）;
????????????}
????????????else
????????????{???????????????????????????????????????????????????????????????????????????//use?custom?Exception?Error?number?0
????????????????try
????????????????{
????????????????????Account.emptyInput（login_input_ID）;
????????????????????Account.emptyInput（login_input_pass）;
????????????????}
????????????????catch?（EmptyException?ex）
????????????????{
????????????????????MessageBox.Show（ex.Message?+?ex.getId（））;
????????????????}
????????????}
????????}
????????private?void?button1_Click（object?sender?EventArgs?e）
????????{
????????????Form2?f2?=?new?Form2（）;
????????????name?=?pass?=?null;
????????????f2.Show（）;
????????}
????????private?void?textBox1_TextChanged（object?sender?EventArgs?e）
????????{
????????????this.textBox1.TextChanged?+=?new?System.EventHandler（this.textBox1_TextChanged）;
????????????login_input_ID?=?this.textBox1.Text;
????????}
????????private?void?textBox2_TextChanged（object?sender?EventArgs?e）
????????{
????????????this.textBox2.TextChanged?+=?new?System.EventHandler（this.textBox2_TextChanged）;
????????????login_input_pass?=?this.textBox2.Text;
????????}
????}
????public?class?BigMoneyArgs?:?EventArgs
????{
????????public?int?ID;
????????public?int?amount_fetch;
????}
????public?delegate?void?BigMoneyHandler（object?sender?BigMoneyArgs?e）;
????//defining?Exception?classes
????class?SurpassException?:?ApplicationException
????{
????????private?int?idnumber;
????????public?SurpassException（String?message?int?id）?:?base（message）
????????{
????????????this.idnumber?=?id;
????????}
????????public?int?getId（）
????????{
????????????return?idnumber;
????????}
????}
????class?EmptyException?:?ApplicationException
????{
????????private?int?idnumber;
????????public?EmptyException（String?message?int?id）?:?base（message）
????????{
????????????this.idnumber?=?id;
???????? ?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2020-04-22?15:50??ATM\
?????目錄???????????0??2020-04-22?15:50??ATM\.vs\
?????目錄???????????0??2020-04-22?15:50??ATM\.vs\ATM\
?????目錄???????????0??2020-04-22?15:50??ATM\.vs\ATM\v16\
?????文件???????53248??2020-03-28?12:53??ATM\.vs\ATM\v16\.suo
?????目錄???????????0??2020-04-22?15:50??ATM\.vs\ATM\v16\Server\
?????目錄???????????0??2020-04-22?15:50??ATM\.vs\ATM\v16\Server\sqlite3\
?????文件???????????0??2020-03-21?14:07??ATM\.vs\ATM\v16\Server\sqlite3\db.lock
?????文件??????614400??2020-03-28?12:53??ATM\.vs\ATM\v16\Server\sqlite3\storage.ide
?????目錄???????????0??2020-04-22?15:50??ATM\ATM\
?????文件????????4202??2020-03-28?12:44??ATM\ATM\ATM.csproj
?????文件?????????189??2020-03-21?14:07??ATM\ATM\App.config
?????文件????????4827??2020-03-28?12:30??ATM\ATM\Form1.Designer.cs
?????文件???????12809??2020-03-28?12:47??ATM\ATM\Form1.cs
?????文件????????5817??2020-03-28?12:30??ATM\ATM\Form1.resx
?????文件????????4205??2020-03-28?12:45??ATM\ATM\Form2.Designer.cs
?????文件????????1443??2020-03-28?12:45??ATM\ATM\Form2.cs
?????文件????????5817??2020-03-28?12:45??ATM\ATM\Form2.resx
?????文件???????10582??2020-03-28?12:53??ATM\ATM\Form3.Designer.cs
?????文件????????2320??2020-03-28?12:53??ATM\ATM\Form3.cs
?????文件????????5817??2020-03-28?12:53??ATM\ATM\Form3.resx
?????文件?????????515??2020-03-21?14:07??ATM\ATM\Program.cs
?????目錄???????????0??2020-04-22?15:50??ATM\ATM\Properties\
?????文件????????1298??2020-03-21?14:07??ATM\ATM\Properties\AssemblyInfo.cs
?????文件????????2819??2020-03-21?14:07??ATM\ATM\Properties\Resources.Designer.cs
?????文件????????5612??2020-03-21?14:07??ATM\ATM\Properties\Resources.resx
?????文件????????1090??2020-03-21?14:07??ATM\ATM\Properties\Settings.Designer.cs
?????文件?????????249??2020-03-21?14:07??ATM\ATM\Properties\Settings.settings
?????目錄???????????0??2020-04-22?15:50??ATM\ATM\bin\
?????目錄???????????0??2020-04-22?15:50??ATM\ATM\bin\Debug\
?????文件???????21504??2020-03-28?12:49??ATM\ATM\bin\Debug\ATM.exe
............此處省略18個文件信息
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