/// <summary>
/// 移除订阅者
/// </summary>
/// <param name="subscriber">订阅者对象</param>
/// <returns>结果</returns>
public async Task<bool> RemoveSubscriber(Subscriber subscriber)
{
//判断订阅者是否位于订阅者列表中
if (!instance.SubscriberList.Contains(subscriber))
{
return false;
}
Topic removedTopic = GetTopicByName(subscriber.TopicName);
//订阅者列表更新
instance.SubscriberList.Remove(subscriber);
//数据库更新
SubscriberController subscriberController = new SubscriberController(db.Subscribers);
subscriberController.SetSubscriber(subscriber);
subscriberController.DeleteSubscriber();
//话题列表更新
instance.TopicList.Remove(removedTopic);
//数据库更新
TopicController topicController = await GetTopicController(removedTopic);
topicController.DeleteTopic();
//向服务器请求删除订阅者
client.RemoveSubscriber(subscriber);
return true;
}
/// <summary>
/// 通过订阅者位置移除订阅者
/// </summary>
/// <param name="position">订阅者位置</param>
/// <returns>结果</returns>
public async Task<bool> RemoveSubsriberAt(int position)
{
if (position < 0 || position > instance.SubscriberList.Count)
{
return false;
}
Subscriber subscriber = instance.SubscriberList[position];
Topic removedTopic = GetTopicByName(subscriber.TopicName);
//订阅者列表更新
instance.SubscriberList.Remove(subscriber);
//数据库更新
SubscriberController subscriberController = new SubscriberController(db.Subscribers);
subscriberController.SetSubscriber(subscriber);
subscriberController.DeleteSubscriber();
//话题列表更新
instance.TopicList.Remove(removedTopic);
//数据库更新
TopicController topicController = await GetTopicController(removedTopic);
topicController.DeleteTopic();
//向服务器请求删除订阅者
client.RemoveSubscriber(subscriber);
//移除成功返回真
return true;
}
/// <summary>
/// 移除订阅者（群组话题使用）
/// </summary>
/// <param name="subscriber">订阅者对象</param>
/// <returns>结果</returns>
public async Task <bool> RemoveSubscriber(Subscriber subscriber)
{
//判断订阅者是否位于订阅者列表中
if (!instance.SubsriberList.Contains(subscriber))
{
//订阅者不存在返回假
return(false);
}
instance.SubsriberList.Remove(subscriber);
//调用订阅者控制器删除订阅者
SubscriberController subscriberController = new SubscriberController(db.Subscribers);
subscriberController.SetSubscriber(subscriber);
subscriberController.DeleteSubscriber();
//更新话题时间戳
instance.LastUsed = ChatMessageBuilder.GetTimeStamp();
var dbContext = db.Topics.GetRepository();
await dbContext.UpsertTopic(instance);
//删除成功返回真
return(true);
}