일단 nuget에서 log4net을 설치한다. LogMaster.cs public enum LogType { INFO, DEBUG, ERROR, ALL } public class LogData { public DateTime TimeStamp { get; set; } public string Date { get { return TimeStamp.ToString("yyyy-MM-dd"); } } public string Time { get { return TimeStamp.ToString("HH:mm:ss.fff"); } } public LogType LogType { get; set; } public string StrLogType { get { return LogType.ToString(); } } p..