Logging.cs

public class Logging : PolicyInjectionAttributeBase
{
    //指定Log File Name
    public string LogFileName { get; set; }
    //override AfterInvoke方法
    public override void AfterInvoke()
    {
        var msg = $"\r\n Method '{this.MethodBase.Name}' has been called - {DateTime.Now.ToString()} ";
        SaveLog(msg);
    }
    //寫入Log
    private void SaveLog(string msg)
    {
        if (System.IO.File.Exists(LogFileName))
        {
            System.IO.File.AppendAllText(LogFileName, msg);
        }
        else
        {
            System.IO.File.WriteAllText(LogFileName, msg);
        }
    }
}