我目前正在开发一个 C# 应用程序。想象一下有结账的店面。我有一个字典结构,其中对象作为键,整数对象计数器作为值。
结构如下所示:
Dictionary<myObject, int> items.
基本思想是,将 Items 字典传递到方法中。我只是将唯一的myObjects添加到字典中。myObject 附加了一个计数器规则。一旦计数器规则被填满,我想对字典中的所有myObects进行计算。
myObject 看起来像这样:
public class myObject
{
string ItemId { get; set; }
Discount Discount { get; set; }
}
public class Discount
{
public int Count { get; set; }
public decimal Price { get; set; }
public IDiscountHandler DiscountHandler => new DiscountHandler();
}
一个示例 myObject 可能如下所示:
var myObectA = new myObject()
{
ItemId = "A"
};
var discountA = new Discount()
{
Count = 2,
Price = 12 // special price, if 2 myObjects were added to the Dictionary
};
myObjectA.Discount = discountA;
1(我填写项目字典并将其传递给处理程序方法:
private decimal _totalDiscountedValue { get; set; } = 0;
if (!_items.ContainsKey(myObject))
{
_items.Add(myObject, 1);
}
else
{
_items[myObject]++;
}
_totalDiscountedValue += _discountHandler.CalculateDiscount(_items);
2(在我的处理程序中,一旦计数器规则已满,我尝试汇总所有折扣值。但不幸的是,我在这里挣扎:
public class DiscountHandler : DiscountHandler
{
private decimal _totalDiscount { get; set; } = 0;
public override decimal CalculateDiscount(IDictionary<myObject, int> items)
{
if (items == null) throw new ArgumentNullException(nameof(items));
// I'm struggeling here:
// check if Dictionary[i].Dicount.Count = Dictionary.Value
// then _totalDiscount += Dictionary[i].Discount.Price
return _totalDiscount;
}
}
您知道如何解决此问题,或者您对如何解决此问题有想法吗?
谢谢!!
您可以使用 foreach 遍历字典,如下所示:
public override decimal CalculateDiscount(IDictionary<myObject, int> items)
{
if (items == null) throw new ArgumentNullException(nameof(items));
foreach (var kvp in items)
{
if (kvp.Key.Discount.Count == kvp.Value)
_totalDiscount += kvp.Key.Discount.Price;
}
return _totalDiscount;
}
使用 Linq
//check if yourDictonary is not null
var sum = yourDictonary.Select(x => x.Key.Discount.Count == x.Value).Sum(x => x.Value)
如果我正确理解了这个问题,也许这样做会起作用
foreach (var item in items)
{
if (item.Key.Discount.Count == item.Value)
_totalDiscount += item.Key.Discount.Price;
}
return __totalDiscount;