public void WriteLog(string msg)
{
string filePath = AppDomain.CurrentDomain.BaseDirectory + "Log";
if (!Directory.Exists(filePath))
{
Directory.CreateDirectory(filePath);
}
string logPath = AppDomain.CurrentDomain.BaseDirectory + "Log\\" + DateTime.Now.ToString("yyyy-MM-dd") + ".txt";
try
{
using (StreamWriter sw = File.AppendText(logPath))
{
sw.WriteLine("消息：" + msg);
sw.WriteLine("時間：" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));
sw.WriteLine("**************************************************");
sw.WriteLine();
sw.Flush();
sw.Close();
sw.Dispose();
}
}
catch (IOException e)
{
using (StreamWriter sw = File.AppendText(logPath))
{
sw.WriteLine("異常：" + e.Message);
sw.WriteLine("時間：" + DateTime.Now.ToString("yyy-MM-dd HH:mm:ss"));
sw.WriteLine("**************************************************");
sw.WriteLine();
sw.Flush();
sw.Close();
sw.Dispose();
}
}
}

C# 寫日誌的方法