/// <summary>添加一个日志提供者</summary>
/// <param name="log"></param>
/// <returns></returns>
public CompositeLog Add(LoggerBase log)
{
Logs.Add(log); return(this);
}
/// <summary>实例化</summary>
/// <param name="log"></param>
public CompositeLog(LoggerBase log)
{
Logs.Add(log); Level = log.Level;
}