Winform程序当运行exe 停止响应时 如何记录下日志？

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

namespace WindowsFormsApplication3
{
    static class Program
    {
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.SetUnhandledExceptionMode(UnhandledExceptionMode.CatchException);
            //添加非UI上的异常.
            AppDomain.CurrentDomain.UnhandledException += new UnhandledExceptionEventHandler(CurrentDomain_UnhandledException);

            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }
        private static void CurrentDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e)
        {
            try
            {
                Exception ex = (Exception)e.ExceptionObject;
                
                WriteLog(ex.Message + "\n\nStack Trace:\n" + ex.StackTrace);
            }
            catch (Exception exc)
            {
                try
                {
                    MessageBox.Show(" Error",
                        " Could not write the error to the log. Reason: "
                        + exc.Message, MessageBoxButtons.OK, MessageBoxIcon.Stop);
                }
                finally
                {
                    Application.Exit();
                }
            }
        }
        static void WriteLog(string str)
        {
            if (!Directory.Exists("ErrLog"))
            {
                Directory.CreateDirectory("ErrLog");
            }
            string fileName = DateTime.Now.ToString("yyyy-MM-dd")+"ErrLog.txt";
            using (var sw = new StreamWriter(@"ErrLog\" + fileName, true))
            {
                sw.WriteLine("***********************************************************************");
                sw.WriteLine(DateTime.Now.ToString("HH:mm:ss"));
                sw.WriteLine(str);
                sw.WriteLine("---------------------------------------------------------");
                sw.Close();
            }
        }
    }
}