写日志追踪程序运行过程

using System;
using System.IO;
using System.Runtime.InteropServices;

namespace 超级DTU
{
    class SystemFile
    {
        private static string m_fileName = AppDomain.CurrentDomain.BaseDirectory + "客户端.txt";
        private const int FO_DELETE = 0x3;
        private const ushort FOF_NOCONFIRMATION = 0x10;
        private const ushort FOF_ALLOWUNDO = 0x40;

        public static String FileName
        {
            get
            {
                return (m_fileName);
            }
            set
            {
                if (value != null || value != "")
                {
                    m_fileName = value;
                }
            }
        }

        /// <summary>
        /// 构造_SHFILEOPSTRUCT
        /// </summary>
        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
        public class _SHFILEOPSTRUCT
        {
            public IntPtr hwnd;
            public UInt32 wFunc;
            public string pFrom;
            public string pTo;
            public UInt16 fFlags;
            public Int32 fAnyOperationsAborted;
            public IntPtr hNameMappings;
            public string lpszProgressTitle;
        }

        /// <summary>
        /// 引入SHFileOperation
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        [DllImport("shell32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
        private static extern int SHFileOperation([In, Out] _SHFILEOPSTRUCT str);

        /// <summary>
        /// 将文件删除进入回收站
        /// </summary>
        /// <param name="path">文件路径</param>
        /// <returns>文件操作是否成功</returns>
        public static int Delete(string path)
        {
            _SHFILEOPSTRUCT pm = new _SHFILEOPSTRUCT();
            pm.wFunc = FO_DELETE;
            pm.pFrom = path + '/0';
            pm.pTo = null;
            pm.fFlags = FOF_ALLOWUNDO | FOF_NOCONFIRMATION;
            return SHFileOperation(pm);
        }

        /// <summary>
        /// 记录日志至文本文件
        /// </summary>
        /// <param name="message">记录的内容</param>
        public static void CreateErrorLog(string message)
        {
            try
            {
                if (File.Exists(m_fileName))
                {
                    ///如果日志文件已经存在，则直接写入日志文件
                    StreamWriter sr = File.AppendText(FileName);
                    sr.WriteLine(DateTime.Now.ToString() + "  " + message);
                    sr.Close();
                }
                else
                {
                    ///创建日志文件
                    StreamWriter sr = File.CreateText(FileName);
                    sr.Close();
                    sr = File.AppendText(FileName);
                    sr.WriteLine(DateTime.Now.ToString() + "  " + message);
                    sr.Close();
                }
            }
            catch (Exception)
            {
               
            }
        }
    }
}