C#简单写日志

        public static string LogDirectory = GetDirectoryName(Assembly.GetAssembly(typeof(LogManager))) + "\\Log";
        //public static string LogDirectory = AppDomain.CurrentDomain.BaseDirectory + "Log\\";

        public static string GetAssemblyPath(Type type)
        {
            return GetAssemblyPath(type.Assembly);
        }
        public static string GetDirectoryName(Assembly assembly)
        {
            return Path.GetDirectoryName(GetAssemblyPath(assembly));
        }
        public static string GetAssemblyPath(Assembly assembly)
        {
            string escapedCodeBase = assembly.EscapedCodeBase;
            if (IsFileUri(escapedCodeBase))
            {
                return GetAssemblyPathFromEscapedCodeBase(escapedCodeBase);
            }
            return assembly.Location;
        }
        public static string GetAssemblyPathFromEscapedCodeBase(string escapedCodeBase)
        {
            return new Uri(escapedCodeBase).LocalPath;
        }
        private static bool IsFileUri(string uri)
        {
            return uri.ToLower().StartsWith(Uri.UriSchemeFile);
        }

        


        /// <summary>
        /// 保存的最多日志数量
        /// </summary>
        private static int MaxLogCount = 365;

        /// <summary>
        /// 
        /// </summary>
        /// <param name="msg"></param>
        /// <param name="logfilename">日志文件名称</param>
        public static void Write(string msg, string logfilename = "")
        {
            try
            {
                DeleteLog();

                string datapath = GetLogFilePath(logfilename);

                if (System.IO.File.Exists(datapath))//追加
                {
                    using (FileStream fs = new FileStream(datapath, FileMode.Append))
                    {
                        using (StreamWriter sw = new StreamWriter(fs))
                        {
                            //开始写入
                            sw.WriteLine("\n");
                            sw.WriteLine("当前时间：" + DateTime.Now.ToString());
                            sw.WriteLine("日志信息：" + msg);
                            //清空缓冲区
                            sw.Flush();
                            //关闭流
                            sw.Close();
                            fs.Close();
                        }
                    }
                }
                else//创建
                {
                    using (FileStream fs = new FileStream(datapath, FileMode.Create))
                    {
                        using (StreamWriter sw = new StreamWriter(fs))
                        {
                            //开始写入
                            sw.WriteLine("当前时间：" + DateTime.Now.ToString());
                            sw.WriteLine("日志信息：" + msg);
                            //清空缓冲区
                            sw.Flush();
                            //关闭流
                            sw.Close();
                            fs.Close();
                        }
                    }
                }
            }
            catch
            {

            }
        }


        public static void Write(Exception ex, string logfilename = "")
        {
            try
            {
                DeleteLog();

                string datapath = GetLogFilePath(logfilename);

                if (System.IO.File.Exists(datapath))//追加
                {
                    using (FileStream fs = new FileStream(datapath, FileMode.Append))
                    {
                        using (StreamWriter sw = new StreamWriter(fs))
                        { //开始写入
                            sw.WriteLine("\n");
                            sw.WriteLine("当前时间：" + DateTime.Now.ToString());
                            sw.WriteLine("异常信息：" + ex.Message);
                            sw.WriteLine("异常对象：" + ex.Source);
                            sw.WriteLine("调用堆栈：" + ex.StackTrace);
                            sw.WriteLine("消息：" + ex.InnerException.Message);
                            sw.WriteLine("触发方法：" + ex.TargetSite);
                            //清空缓冲区
                            sw.Flush();
                            //关闭流
                            sw.Close();
                            fs.Close();
                        }
                    }
                }
                else//创建
                {
                    using (FileStream fs = new FileStream(datapath, FileMode.Create))
                    {
                        using (StreamWriter sw = new StreamWriter(fs))
                        {
                            //开始写入
                            sw.WriteLine("当前时间：" + DateTime.Now.ToString());
                            sw.WriteLine("异常信息：" + ex.Message);
                            sw.WriteLine("异常对象：" + ex.Source);
                            sw.WriteLine("调用堆栈：" + ex.StackTrace);
                            sw.WriteLine("消息：" + ex.InnerException.Message);
                            sw.WriteLine("触发方法：" + ex.TargetSite);
                            //清空缓冲区
                            sw.Flush();
                            //关闭流
                            sw.Close();
                            fs.Close();
                        }
                    }
                }
            }
            catch
            {

            }
        }


        public static void Write(object obj, string logfilename = "")
        {
            Write(obj.ToString());
        }


        /// <summary>
        /// 获取日志存储路径
        /// </summary>
        /// <returns></returns>
        private static string GetLogFilePath(string logfilename)
        {
            string filepath = "";

            if (!System.IO.Directory.Exists(LogDirectory))
            {
                System.IO.Directory.CreateDirectory(LogDirectory);
            }

            filepath = LogDirectory + DateTime.Now.ToString("yyyy-MM-dd") + "_" + logfilename + ".txt";

            return filepath;
        }

        /// <summary>
        /// 删除多余日志
        /// </summary>
        private static void DeleteLog()
        {
            DirectoryInfo dic = new DirectoryInfo(LogDirectory);
            //不必每天都删除日志，整10天删除
            if (!(DateTime.Now.Day % 10 == 0))
            {
                return;
            }

            if (dic.Exists)
            {
                var files = dic.GetFiles();
                if (files.Length < MaxLogCount)
                    return;

                List<int> names = new List<int>();
                for (int i = 0; i < files.Length; i++)
                {
                    string strname = Path.GetFileNameWithoutExtension(files[i].Name);
                    int name;
                    if (int.TryParse(strname, out name))
                    {
                        names.Add(name);
                    }
                }

                names.Sort();//升序
                //names.Reverse();//降序

                for (int i = 0; i < names.Count - MaxLogCount; i++)
                {
                    string path = System.IO.Path.Combine(LogDirectory, names[i].ToString() + ".txt");
                    File.Delete(path);
                }
            }
        }