private string GetCouponSurplus(int CouponId) { int couponSurplus = CouponHelper.GetCouponSurplus(CouponId); int cantObtainUserNum = CouponHelper.GetCantObtainUserNum(CouponId); if (couponSurplus >= this.UserNum - cantObtainUserNum) { return(couponSurplus.ToString()); } return("<span>" + couponSurplus + "</span><span style='color:red;'>(数量不足)</span>"); }