//添加关注
public void Add(String SourceQQ, String Attention, String GroupNum)
{
if (Attention.Contains(" ") || Attention.Equals(""))
{
throw new Exception("不允许输入空格和空字符串");
}
using (var dbcontext = new AttentionContext())
{
Attention newatt = new Attention(SourceQQ, GroupNum, Attention);
dbcontext.Attentions.Add(newatt);
dbcontext.SaveChanges();
this.Attentions = QueryAll();
}
UpdateListeners();
}
//删除关注
public Boolean Remove(String SourceQQ, String Attention, String GroupNum)
{
using (var dbcontext = new AttentionContext())
{
Attention temp = dbcontext.Attentions.FirstOrDefault(p => p.Listener == SourceQQ && p.Group == GroupNum && p.AttentionPoint == Attention);
if (temp != null)
{
dbcontext.Attentions.Remove(temp);
dbcontext.SaveChanges();
this.Attentions = QueryAll();
UpdateListeners();
return(true);
}
else
{
return(false);
}
}
}
//更新关注
public Boolean Update(String SourceQQ, String OldAttention, String NewAttention, String GroupNum)
{
//检查是否存在，
//如有删除之，并插入新的
//允许GroupNum为空，这样就只要查询所有的Attention字段相等的部分
using (var dbcontext = new AttentionContext())
{
var quary = dbcontext.Attentions
.Where(att => att.AttentionPoint == OldAttention && att.Group == GroupNum);
foreach (Attention att in quary)
{
dbcontext.Attentions.Remove(att);
dbcontext.Attentions.Add(new Attention(SourceQQ, GroupNum, NewAttention));
}
dbcontext.SaveChanges();
this.Attentions = QueryAll();
}
return(true);
}