/// <summary>
/// 修改商品价格
/// </summary>
/// <param name="item"></param>
/// <param name="price"></param>
public void EditPrice(ShoppingcartItem item, decimal price)
{
if (item == null)
{
throw new OrderException("指定商品不存在，不能改价！");
}
if (item.Product.IsWeightProduct())
{
throw new OrderException("称重商品不允许修改价格！");
}
if (!item.EnableEditPrice)
{
throw new OrderException("后台设定该商品不允许改价！");
}
if (Math.Abs(item.MarketingPrice - price) > 0.005m && item.Product.SysPrice != price)
{
item.ManualPrice = price;
if (item.SaleState == SaleState.Gift && 0m < price)//赠品改价，如果price>0则状态自动转换为正常销售
{
item.SaleState = SaleState.Normal;
}
else if (item.SaleState != SaleState.Gift && price == 0m)//正常商品改价，如果price==0则状态自动转换为销售赠送
{
item.SaleState = SaleState.Gift;
}
item.EditedPrice = true;
}
}
/// <summary>
/// 修改商品数量
/// </summary>
/// <param name="item"></param>
/// <param name="num"></param>
public void EditProductNumber(ShoppingcartItem item, decimal num)
{
if (item == null)
{
throw new OrderException("指定商品不存在，不能修改数量！");
}
if (item.Product.IsWeightProduct())
{
throw new OrderException("称重商品不允许修改重量！");
}
if (!item.EnableEditNum)
{
throw new OrderException("后台设定该商品不允许修改数量！");
}
item.Number = new ProductNumber(num, item.Product.SubUnit, item.Product.IsWeightProduct());
}
