/// <summary>
/// 將異常打印到LOG文件
/// </summary>
/// <param name="ex">異常</param>
/// <param name="LogAddress">日志文件地址</param>
public static void WriteLog(Exception ex, string LogAddress = "")
{
    //如果日志文件為空，則默認在Debug目錄下新建 YYYY-mm-dd_Log.log文件
    if (LogAddress == "")
    {
        LogAddress = Environment.CurrentDirectory + '//' +
            DateTime.Now.Year + '-' +
            DateTime.Now.Month + '-' +
            DateTime.Now.Day + "_Log.log";
    }

    //把異常信息輸出到文件
    StreamWriter fs = new StreamWriter(LogAddress, true);
    fs.WriteLine("當前時間：" + DateTime.Now.ToString());
    fs.WriteLine("異常信息：" + ex.Message);
    fs.WriteLine("異常對象：" + ex.Source);
    fs.WriteLine("調用堆棧：/n" + ex.StackTrace.Trim());
    fs.WriteLine("觸發方法：" + ex.TargetSite);
    fs.WriteLine();
    fs.Close();
}