/// <summary>
/// 购买主题
/// </summary>
/// <param name="uid">用户ID</param>
/// <param name="tid">主题ID</param>
/// <param name="posterid">发帖人ID</param>
/// <param name="price">售价</param>
/// <param name="netamount">净收入</param>
/// <param name="creditsTrans">要更新的扩展积分ID</param>
public static void BuyTopic(int uid, int tid, int posterid, int price, float netamount, int creditsTrans)
{
DatabaseProvider.GetInstance().BuyTopic(uid, tid, posterid, price, netamount, creditsTrans);
if (appDBCache)
IUserService.BuyTopic(uid, tid, posterid, price, netamount, creditsTrans);
}