using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace DemoException
{
  static class Program
  {
    /// 

    /// 应用程序的主入口点。
    /// 
    [STAThread]
    static void Main()
    {
      Application.SetUnhandledExceptionMode(UnhandledExceptionMode.CatchException);
      //处理UI线程异常
      Application.ThreadException += new System.Threading.ThreadExceptionEventHandler(Application_ThreadException);
      //处理非线程异常
      AppDomain.CurrentDomain.UnhandledException +=new UnhandledExceptionEventHandler(CurrentDomain_UnhandledException) ;
      Application.EnableVisualStyles();
      Application.SetCompatibleTextRenderingDefault(false);
      Application.Run(new FrmMain());
      glExitApp = true;//标志应用程序可以退出
    }

    /// 

    /// 是否退出应用程序
    /// 
    static bool glExitApp = false;

    /// 

    /// 处理未捕获异常
    /// 
    /// 
    /// 
    private static void CurrentDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e)
    {

      SaveLog("-----------------------begin--------------------------");
      SaveLog("CurrentDomain_UnhandledException"+DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss"));
      SaveLog("IsTerminating : " + e.IsTerminating.ToString());
      SaveLog(e.ExceptionObject.ToString());
      SaveLog("-----------------------end----------------------------");
      while (true)
      {//循环处理，否则应用程序将会退出
        if (glExitApp)
        {//标志应用程序可以退出，否则程序退出后，进程仍然在运行
          SaveLog("ExitApp");
          return;
        }
        System.Threading.Thread.Sleep(2 * 1000);
      };
    }

    /// 

    /// 处理UI主线程异常
    /// 
    /// 
    /// 
    private static void Application_ThreadException(object sender, System.Threading.ThreadExceptionEventArgs e)
    {
      SaveLog("-----------------------begin--------------------------");
      SaveLog("Application_ThreadException:" + e.Exception.Message);
      SaveLog(e.Exception.StackTrace);
      SaveLog("-----------------------end----------------------------");
    }

    public static void SaveLog(string log)
    {
      string filePath =AppDomain.CurrentDomain.BaseDirectory+ @"\objPerson.txt";
      //采用using关键字，会自动释放
      using (FileStream fs = new FileStream(filePath, FileMode.Append))
      {
        using (StreamWriter sw = new StreamWriter(fs, Encoding.Default))
        {
          sw.WriteLine(log);
        }
      }
    }
  }
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace DemoException
{
  public partial class FrmMain : Form
  {

    public FrmMain()
    {
      InitializeComponent();
    }

    private void FrmMain_Load(object sender, EventArgs e)
    {
      
    }

    private void btnTestUI_Click(object sender, EventArgs e)
    {
      int a = 0;
      int c = 10 / a;
    }

    private void btnTest2_Click(object sender, EventArgs e)
    {
      Thread t = new Thread(new ThreadStart(() =>
      {
        int a = 0;
        int c = 10 / a;
      }));
      t.IsBackground = true;
      t.Start();
    }
  }
}