C#捕获未处理异常

Console控制台程序

使用AppDomain.CurrentDomain.UnhandledException捕获所有线程的未处理异常

注1：执行完异常捕获的OnUncaughtExceptionHandler回调函数后，进程会立即退出。

using System;

namespace ConsoleApp1
{
    class Program
    { 
        static void Main(string[] args)
        {
            AppDomain.CurrentDomain.UnhandledException += OnUncaughtExceptionHandler;

            Test();

            Console.ReadLine();
        }

        private static void OnUncaughtExceptionHandler(object sender, System.UnhandledExceptionEventArgs args)
        {
            if (args != null && args.ExceptionObject != null)
            {
                Exception e = args.ExceptionObject as Exception;
                if (e != null)
                {
                    Console.WriteLine("Message: {0}", e.Message);
                    Console.WriteLine("StackTrace: {0}", e.StackTrace);
                }
            }
        }
    }
}

捕获主线程的未处理异常

using System;

namespace ConsoleApp1
{
    class Program
    { 
        static void Test()
        {
            int a = 12;
            int b = 0;
            int c = a / b;  // 整数除零异常  System.DivideByZeroException
        }
    }
}

捕获其他线程的未处理异常

using System;
using System.Threading;

namespace ConsoleApp1
{
    class Program
    { 
        static void Test()
        {
            // 创建一个线程并启动执行
            Thread TestThread = new Thread(() =>
            {
                throw new Exception();
            });
            TestThread.Start();
        }
    }
}

WindowsForm窗体程序

使用AppDomain.CurrentDomain.UnhandledException捕获所有线程（UI线程和其他线程）的未处理异常

① 需要将Application的UnhandledExceptionMode设置为UnhandledExceptionMode.ThrowException（或UnhandledExceptionMode.Automatic）。

② 执行完异常捕获的OnUncaughtExceptionHandler回调函数后，进程会立即退出。

using System;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false); 
            AppDomain.CurrentDomain.UnhandledException += OnUncaughtExceptionHandler;
            Application.SetUnhandledExceptionMode(UnhandledExceptionMode.ThrowException);
            Application.Run(new Form1());
        }

        private static void OnUncaughtExceptionHandler(object sender, System.UnhandledExceptionEventArgs args)
        {
            if (args != null && args.ExceptionObject != null)
            {
                Exception e = args.ExceptionObject as Exception;
                if (e != null)
                {
                    MessageBox.Show(string.Format("Message:{0}\nStackTrace:{1}", e.Message, e.StackTrace), "Uncaught Exception");
                }
            }
        }
    }
}

捕获UI线程的未处理异常

WindowsForm程序中UI线程即主线程，该线程中处理窗体中各种UI的消息。

using System;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            int a = 12;
            int b = 0;
            int c = a / b;  // 整数除零异常  System.DivideByZeroException
        }

    }
}

捕获其他线程的未处理异常

using System;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            // 创建一个线程并启动执行
            System.Threading.Thread TestThread = new System.Threading.Thread(() =>
            {
                throw new Exception();
            });
            TestThread.Start();
        }
    }
}

使用Application.ThreadException捕获UI线程（主线程）的未处理异常

① Application.ThreadException仅能用于UI线程（主线程）的未处理异常捕获，无法捕获其他线程

② 需要将Application的UnhandledExceptionMode设置为UnhandledExceptionMode.CatchException。

③ UnhandledExceptionMode设置为UnhandledExceptionMode.CatchException后，即使绑定了AppDomain.CurrentDomain.UnhandledException全局捕获，UI线程（主线程）仍然只会被Application.ThreadException捕获

④ 执行完异常捕获的ApplicationThreadException回调函数后，进程不会退出，仍可继续运行。

using System;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.ThreadException += new System.Threading.ThreadExceptionEventHandler(ApplicationThreadException);
            Application.SetUnhandledExceptionMode(UnhandledExceptionMode.CatchException);
            Application.Run(new Form1());
        }

        static void ApplicationThreadException(object sender, System.Threading.ThreadExceptionEventArgs e)
        {
            MessageBox.Show(string.Format("Message:{0}\nStackTrace:{1}", e.Exception.Message, e.Exception.StackTrace), "Application Thread Exception");
        }

    }
}