Question

我有两个系列：

public interface ISomeNeededInterface
{
    string Name { get; set; }
    Guid Guid { get; set; }
}

public class Order : ISomeNeededInterface
{
    public string Name { get; set; }
    public Guid Guid { get; set; }
}

public class SalesOrder
{   
  public string Name { get { return Item.Name;} }
  public double Price { get; set; }
  public int Quantity { get; set; }
  private ISomeNeededInterface Item { get; private set; }

  public SalesOrder(ISomeNeededInterface _item)
  {
    Item = _item;
    Price = _item.Pricce;
    Quantity = _item.Quantity;
  }   
}

List<SalesOrder> Orders1 = new List<SalesOrder>()
  {
     new SalesOrder(new Order {"Ballon1", Guid.NewGuid();}, 2.54, 1),
     new SalesOrder(new Order {"Ballon2", Guid.NewGuid();}, 2.54, 1),
  };

List<SalesOrder> Orders2 = new List<SalesOrder>()
  {
     new SalesOrder(new Order {"Ballon1", Guid.NewGuid();}, 2.54, 2),
     new SalesOrder(new Order {"Ball", Guid.NewGuid();}, 4.52, 1)
  };

如何将两个集合合并为一个集合，以及合并那些重合的元素＆＃34;名称＆＃34;字段？同时，对于元素，合并的名称必须是字段＆＃34; Quantity＆＃34;的总和。最后一定是

List<SalesOrder> SummOrders = {"Ballon1", 2.54, 3, SOME_Item; "Ballon2", 2.54, 1, SOME_Item ;  "Ball", 4.52, 1, SOME_Item }

编辑：需要澄清简单问题？好的，有更多真实的＆＃34;编辑＆＃34;

Answer 1

使用Concat，GroupBy和Sum：

List<SalesOrder> merged = Order1.Concat(Orders2)
    .GroupBy(so => so.Name)
    .Select(g => new SalesOrder(g.Key, g.First().Price, g.Sum(so => so.Quantity)))
    .ToList();

考虑Name可能相同，但它有不同的Price，所以它实际上是一个不同的产品。然后，您可以按包含两个属性的匿名类型进行分组（理想情况下，您使用唯一标识符）：

List<SalesOrder> merged = Order1.Concat(Orders2)
    .GroupBy(so => new { so.Name, so.Price })
    .Select(g => new SalesOrder(g.Key.Name, g.Key.Price, g.Sum(so => so.Quantity)))
    .ToList();

合并两个集合并对重复项的字段求和

1 个答案: