/// <summary> /// 输出一行内容。 /// </summary> /// <param name="level">级别,为空时将默认为{Empty}</param> /// <param name="message">消息</param> public virtual void WriteLine(string level, string message) { if (string.IsNullOrEmpty(level)) { level = "{Empty}"; } if (_levels.Count == 0 || _levels.Contains(level)) { OnWriteLine(level, message); } }