/// <summary>
/// 获得指定用户的指定积分扩展字段的值
/// </summary>
/// <param name="uid">用户id</param>
/// <param name="extid">扩展字段序号(1-8)</param>
/// <returns>值</returns>
public static float GetUserExtCredits(int uid, int extid)
{
if (appDBCache)
IUserService.GetUserExtCredits(uid, extid);
return DatabaseProvider.GetInstance().GetUserExtCredits(uid, extid);
}