合并两个集合，总结等领域的重复项目

Question

我有两个集合：

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) 
    }; 

如何两个集合合并成一个，以及合并已恰逢“名称”字段这些元素？同时，对于这些元素，合并名称必须为“数量”字段的总和。最后必须是

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

编辑：需要澄清的简单问题??好了，有更多的真正的“编辑”

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(); 

认为Name可以等于但它有一个不同的Price，所以它实际上是一个不同的产品。然后，您可以通过包含两个属性的匿名类型进行分组（最好使用唯一标识符）：

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();