[C#] Singletone Instance 생성을 이용한 Log File Write 처리 예제 입니다.

[C#] Singletone Instance 생성을 이용한 Log File Write 처리 예제 입니다.

using System; using System.Collections.Generic; using System.Diagnostics; using System.IO; using System.Linq; using System.Reflection; using System.Text; using System.Threading.Tasks;   namespace GmSFaxAgentWpf.Commons {     public class CommonUtils     {         private static readonly Lazy<CommonUtils> commonUtils = new Lazy<CommonUtils>(() => new CommonUtils());         private object lockObj = new object();         public static CommonUtils Instance { get => commonUtils.Value; }           private CommonUtils()         {           }             public void WriteLog(string methodName,string logStr)         {                             try             {                 lock (lockObj)                 {                     string logDir = $@"{Path.GetDirectoryName(Assembly.GetEntryAssembly().Location)}\log";                     if (!Directory.Exists(logDir))                         Directory.CreateDirectory(logDir);                       string logFile = $@"{logDir}\{DateTime.Now:yyyyMMdd}.log";                       using (FileStream fileStream = new FileStream(logFile, FileMode.Append))                     using (StreamWriter streamWriter = new StreamWriter(fileStream, Encoding.Default))                     {                         streamWriter.WriteLine($"[{DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss")}][{methodName}][INFO] - {logStr}");                           streamWriter.Close();                         fileStream.Close();                     }                 }               } catch(Exception exception)             {                 Debug.WriteLine(exception);             }         }           public void WriteLog(string methodName, Exception exception)         {             try             {                 lock (lockObj)                 {                     string logDir = $@"{Path.GetDirectoryName(Assembly.GetEntryAssembly().Location)}\log";                     if (!Directory.Exists(logDir))                         Directory.CreateDirectory(logDir);                       string logFile = $@"{logDir}\{DateTime.Now:yyyyMMdd}.log";                       using (FileStream fileStream = new FileStream(logFile, FileMode.Append))                     using (StreamWriter streamWriter = new StreamWriter(fileStream, Encoding.Default))                     {                         streamWriter.WriteLine($"[{DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss")}][{methodName}][ERROR] - {exception}");                           streamWriter.Close();                         fileStream.Close();                     }                 }             }             catch (Exception e)             {                 Debug.WriteLine(e);             }           }       } }