/// <summary>
/// SendEmailForBulletin的构造函数，专为测试提供
/// </summary>
public SendEmailForBulletin(int bulletinID, string to, List <string> cc, IBulletinDal mockDal)
{
_BulletinID = bulletinID;
_To = to;
_Cc = cc;
_BulletinDal = mockDal;
}
public BulletinManager(IBulletinDal bulletinDal)
{
_bulletinDal = bulletinDal;
}
