/// <summary>
/// 应用合成规则
/// </summary>
/// <returns>无法添加进背包的物品（背包已满或是不可打包物品）</returns>
public ItemGroup[] ApplyExpression(int expressionId)
{
var expression = GetExpression(expressionId);
foreach (var costItem in expression.Input)
{
_Package.CostItem(costItem);
}
return((
from createdItem in expression.Output
let overflow = _Package.PutItem(createdItem).Remaining.FirstOrDefault().Count
where overflow > 0
select(createdItem.Id, overflow))
.Select(dummy => (ItemGroup)dummy).ToArray());
}
