C# 创建一个日志文件

public class LogHelper
    {
        private static string logFolder = AppDomain.CurrentDomain.BaseDirectory + "errorlog";
        private static string logFile;

        /// <summary>
        /// 构造函数
        /// </summary>
        public LogHelper()
        {
            try
            {
                logFile = Path.Combine(logFolder, (DateTime.Now.Date.ToString("yyyy-MM-dd") + ".Log"));
                if (!Directory.Exists(logFolder))
                {
                    Directory.CreateDirectory(logFolder);
                }
                if (!File.Exists(logFile))
                {
                    //日志不存在创建
                    using (StreamWriter write = File.CreateText(logFile))
                    {
                        write.WriteLine("----------记录日志----------");
                    }
                }
            }
            catch { }
        }

        /// <summary>
        /// 追加一条信息
        /// </summary>
        /// <param name="text"></param>
        public void Write(string text)
        {
            try
            {
                using (StreamWriter sw = new StreamWriter(logFile, true, Encoding.UTF8))
                {                                        
                    sw.Write(string.Format("{0}>{1}", DateTime.Now.ToString("[yyyy-MM-dd HH:mm:ss] "), text));
                }
            }
            catch { }
        }

        /// <summary>
        /// 追加一行信息
        /// </summary>
        /// <param name="text"></param>
        public void WriteLine(string text)
        {
            try
            {
                using (StreamWriter sw = new StreamWriter(logFile, true, Encoding.UTF8))
                {
                    sw.Write(string.Format("\r\n{0}>{1}", DateTime.Now.ToString("[yyyy-MM-dd HH:mm:ss] "), text));
                }
            }
            catch { }
        }

    }