异常处理

  1using System;
  2using System.Drawing;
  3using System.Collections;
  4using System.ComponentModel;
  5using System.Windows.Forms;
  6using System.Data;
  7using System.Threading;
  8
  9namespace Exception
 10{
 11    /**//// <summary>
 12    /// 异常处理。
 13    /// </summary>
 14    public class Form1 : System.Windows.Forms.Form
 15    {
 16        private System.Windows.Forms.Button button1;
 17        private System.Windows.Forms.Button button2;
 18        private System.Windows.Forms.Button button3;
 19        /**//// <summary>
 20        /// 必需的设计器变量。
 21        /// </summary>
 22        private System.ComponentModel.Container components = null;
 23
 24        public Form1()
 25        {
 26            //
 27            // Windows 窗体设计器支持所必需的
 28            //
 29            InitializeComponent();
 30
 31            //
 32            // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
 33            //
 34        }
 35
 36        /**//// <summary>
 37        /// 清理所有正在使用的资源。
 38        /// </summary>
 39        protected override void Dispose( bool disposing )
 40        {
 41            if( disposing )
 42            {
 43                if (components != null) 
 44                {
 45                    components.Dispose();
 46                }
 47            }
 48            base.Dispose( disposing );
 49        }
 50
 51        Windows Form Designer generated code#region Windows Form Designer generated code
 52        /**//// <summary>
 53        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
 54        /// 此方法的内容。
 55        /// </summary>
 56        private void InitializeComponent()
 57        {
 58            this.button1 = new System.Windows.Forms.Button();
 59            this.button2 = new System.Windows.Forms.Button();
 60            this.button3 = new System.Windows.Forms.Button();
 61            this.SuspendLayout();
 62            // 
 63            // button1
 64            // 
 65            this.button1.Location = new System.Drawing.Point(49, 72);
 66            this.button1.Name = "button1";
 67            this.button1.Size = new System.Drawing.Size(119, 23);
 68            this.button1.TabIndex = 0;
 69            this.button1.Text = "除 0 异常";
 70            this.button1.TextAlign = System.Drawing.ContentAlignment.TopCenter;
 71            this.button1.Click += new System.EventHandler(this.button1_Click);
 72            // 
 73            // button2
 74            // 
 75            this.button2.Location = new System.Drawing.Point(219, 72);
 76            this.button2.Name = "button2";
 77            this.button2.Size = new System.Drawing.Size(119, 23);
 78            this.button2.TabIndex = 1;
 79            this.button2.Text = "无效对象异常";
 80            this.button2.TextAlign = System.Drawing.ContentAlignment.TopCenter;
 81            this.button2.Click += new System.EventHandler(this.button2_Click);
 82            // 
 83            // button3
 84            // 
 85            this.button3.Location = new System.Drawing.Point(134, 160);
 86            this.button3.Name = "button3";
 87            this.button3.Size = new System.Drawing.Size(119, 23);
 88            this.button3.TabIndex = 2;
 89            this.button3.Text = "自定义异常";
 90            this.button3.TextAlign = System.Drawing.ContentAlignment.TopCenter;
 91            this.button3.Click += new System.EventHandler(this.button3_Click);
 92            // 
 93            // Form1
 94            // 
 95            this.AutoScaleBaseSize = new System.Drawing.Size(8, 18);
 96            this.ClientSize = new System.Drawing.Size(386, 258);
 97            this.Controls.AddRange(new System.Windows.Forms.Control[] {
 98                                                                          this.button3,
 99                                                                          this.button2,
100                                                                          this.button1});
101            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;
102            this.Name = "Form1";
103            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
104            this.Text = "异常处理";
105            this.ResumeLayout(false);
106
107        }
108        #endregion
109
110        /**//// <summary>
111        /// 应用程序的主入口点。
112        /// </summary>
113        [STAThread]
114        static void Main() 
115        {
116            Application.Run(new Form1());
117        }
118        class MyException:ApplicationException
119        {
120            public MyException(String msg):base(msg)
121            {
122                HelpLink = "http://NotARealURL.Microsoft.com/help.html";
123            }
124        }
125        public void ShowException(System.Exception ex)
126        {
127            string str;
128            str = string.Format("Exception:\n\t{0}\n", ex.GetType().ToString());
129            str += string.Format("Message:\n\t{0}\n", ex.Message);
130            str += string.Format("Stack Trace:\n\t{0}\n", ex.StackTrace);
131            str += string.Format("Help Link:\n\t{0}\n", ex.HelpLink);
132            MessageBox.Show(str);
133        }
134        // 除以 0 异常。
135        private void button1_Click(object sender, System.EventArgs e)
136        {
137            int x = 0;
138            try
139            {
140                // 产生异常。
141                x = 10 / x;
142            }
143            catch(System.Exception ex)
144            {
145                ShowException(ex);
146            }
147        }
148        // 无效对象异常。
149        private void button2_Click(object sender, System.EventArgs e)
150        {
151            object a = null;
152            try
153            {
154                MessageBox.Show(a.ToString());
155            }
156            catch(System.Exception ex)
157            {
158                ShowException(ex);
159            }
160        }
161        // 自定义异常。
162        private void button3_Click(object sender, System.EventArgs e)
163        {
164            try
165            {
166                throw(new MyException("这是我自己定义的异常。"));
167            }
168            catch(System.Exception ex)
169            {
170                ShowException(ex);
171            }
172        }
173    }
174}
175