public Topic AddSubTopic(string topic)
{
string topicName = topic.ToLower();
Topic subTopic = GetSubTopic(topicName);
if(subTopic == null)
{
subTopic = new Topic(topicName, this);
this.SubTopics.Add(topicName, subTopic);
}
return subTopic;
}
public Topic(string topicName, Topic parent)
{
this.TopicName = topicName.ToLower();
this.parent = parent;
if(parent == null)
{
this.fullName = "/";
}
else
{
this.fullName = parent.fullName + topicName + "/";
}
}