开心，捕捉子线程内异常的例子

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") ;
            }
        }
    }
}


dialog的代码
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Threading ;

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

        public TestDialog()
        {
            //
            // 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.btnStart = new System.Windows.Forms.Button();
            this.btnClose = new System.Windows.Forms.Button();
            this.SuspendLayout();
            //
            // btnStart
            //
            this.btnStart.Location = new System.Drawing.Point(72, 32);
            this.btnStart.Name = "btnStart";
            this.btnStart.TabIndex = 1;
            this.btnStart.Text = "Start";
            this.btnStart.Click += new System.EventHandler(this.btnStart_Click);
            //
            // btnClose
            //
            this.btnClose.Location = new System.Drawing.Point(200, 32);
            this.btnClose.Name = "btnClose";
            this.btnClose.TabIndex = 2;
            this.btnClose.Text = "Close";
            this.btnClose.Click += new System.EventHandler(this.btnClose_Click);
            //
            // TestDialog
            //
            this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
            this.ClientSize = new System.Drawing.Size(400, 94);
            this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                          this.btnClose,
                                                                          this.btnStart});
            this.Name = "TestDialog";
            this.Text = "TestDialog";
            this.ResumeLayout(false);

        }
        #endregion

        private void btnClose_Click(object sender, System.EventArgs e)
        {
            this.Close() ;
        }

        private void btnStart_Click(object sender, System.EventArgs e)
        {
            TestClass testClass = new TestClass() ;
            testClass.ThrowException += new ExceptionEventHandler(OnException) ;
            Thread thread = new Thread(new ThreadStart(testClass.Run)) ;
            thread.Start() ;
            thread.Join() ;
        }

        public void OnException(ExceptionEventArgs e)
        {
            MessageBox.Show("程序运行出错：" + e.MyException.ToString()) ;
            this.Close() ;
        }

    }//end class

    /// <summary>
    /// 错误捕捉委托
    /// </summary>
    public delegate void ExceptionEventHandler(ExceptionEventArgs e) ;


    /// <summary>
    /// 工作类
    /// </summary>
    public class TestClass
    {
        /// <summary>
        /// 委托
        /// </summary>
        public event ExceptionEventHandler ThrowException ;

        /// <summary>
        /// 委托方法
        /// </summary>
        /// <param name="e"></param>
        protected virtual void OnThrowException(ExceptionEventArgs e)
        {
            if(ThrowException != null)
            {
                ThrowException(e) ;
            }
        }

        /// <summary>
        /// 工作方法
        /// </summary>
        public void Run()
        {
            try
            {
                for(int i = 0 ; i < 100 ; i ++)
                {
                    Console.WriteLine("执行到：{0}" , i) ;
                    Thread.Sleep(100) ;
                    if(i == 50)
                    {
                        throw(new Exception("error")) ;
                    }
                }
            }
            catch(Exception e)
            {
                ExceptionEventArgs exp = new ExceptionEventArgs() ;
                exp.MyException = e ;
                OnThrowException(exp) ;
            }
        }//end method
    }//end class

    /// <summary>
    ///
    /// </summary>
    public class ExceptionEventArgs:EventArgs
    {
        private Exception m_objMyExcepiton ;

        public Exception MyException
        {
            get
            {
                return this.m_objMyExcepiton;
            }
            set
            {
                this.m_objMyExcepiton = value ;
            }
        }
    }//end class
}//end namespace

原文转自：http://www.ltesting.net