开心，捕捉子线程内异常的例子

答案：程序很简单，一个form内有一个按钮，点击后弹出一个对话框，点击对话框start按钮后执行新起一个线程执行一个工作类的某个方法，这个方法故意抛出异常，然后在对话框内捕捉到这个异常。
注意，这儿我是用事件来捕捉异常，这只是其中一种方法

form 的代码
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace CatchThreadError
{
    /// <summary>
    /// Form1 的摘要说明。
    /// </summary>
    public class Form1 : System.Windows.Forms.Form
    {
        private System.Windows.Forms.Button btnTest;
        /// <summary>
        /// 必需的设计器变量。
        /// </summary>
        private System.ComponentModel.Container components = null;

        public Form1()
        {
            //
            // Windows 窗体设计器支持所必需的
            //
            InitializeComponent();

            //
            // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
            //
        }

        /// <summary>
        /// 清理所有正在使用的资源。
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if (components != null) 
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }

        #region Windows Form Designer generated code
        /// <summary>
        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
        /// 此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
            this.btnTest = new System.Windows.Forms.Button();
            this.SuspendLayout();
            // 
            // btnTest
            // 
            this.btnTest.Location = new System.Drawing.Point(192, 96);
            this.btnTest.Name = "btnTest";
            this.btnTest.TabIndex = 0;
            this.btnTest.Text = "Test";
            this.btnTest.Click += new System.EventHandler(this.btnTest_Click);
            // 
            // Form1
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
            this.ClientSize = new System.Drawing.Size(392, 266);
            this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                          this.btnTest});
            this.Name = "Form1";
            this.Text = "Form1";
            this.ResumeLayout(false);

        }
        #endregion

        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main() 
        {
            Application.Run(new Form1());
        }

        private void btnTest_Click(object sender, System.EventArgs e)
        {
            TestDialog td = new TestDialog() ;
            try
            {
                td.ShowDialog() ;
            }
            catch(Exception exp)
            {
                MessageBox.Show("all done") ;
            }
        }
&nb

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