/// <summary>
/// 消息构造，能传递文本、等级、异常和附加对象
/// </summary>
/// <param name="msg">消息文本</param>
/// <param name="lv">消息等级</param>
/// <param name="ex">异常</param>
/// <param name="state">附加对象</param>
public DrawingFrameworkMessage(string msg, DrawingMessageLevel lv, Exception ex = null, object state = null)
{
Message = msg;
Level = lv;
Ex = ex;
Tag = state;
}
/// <summary>
/// 传递一个消息
/// </summary>
/// <param name="msg">消息文本</param>
/// <param name="level">消息等级</param>
/// <param name="ex">可选参数，异常</param>
public virtual void OnMessageSend(string msg, DrawingMessageLevel level, Exception ex = null)
{
if ((int)level >= (int)MessageLevel)
{
MessageListener?.Invoke(sender, new DrawingFrameworkMessage(msg, level, ex: ex));
}
}
