C#中两个异构列表的交集

Question

我想获得两个列表的交集：GameObject 列表和 Realproperty 列表。并在类型为 List 的新列表中获取此结果。 Lot 成为 GameObject 的一员

class GameObject
{
    public string m_lotName;
    public Lot m_lot;
    //other members
}

class Lot
{
    public string m_lotName;
    //other members
}

class RealProperty
{
    public string m_name;
    //other members
}

List<GameObject> allLots = getAllLots();
List<RealProperty> soldRealProperties = getSoldRealProperties();

我想得到一个 List，这将是以下结果： List 由 List 对于 List 的每个游戏对象，我们测试 gameobject.m_lot.m_lotName 是否存在于 List 元素中 .

似乎 LINQ 使之成为可能

我尝试过这样的事情：

List<Lot> soldLots = allLots
            .Select(a => a.GetComponent<Lot>().m_lotName)
            .Where(u => allLots
                       .Select(l => l.m_lot.m_lotName)
                       .Intersect(soldRealProperties
                           .Select(l2 => l2.m_name))
                           );

但是我得到了很多错误，比如这些：

Type `string' does not contain a definition for `m_name' and no extension method `m_name' of type `string' could be found (are you missing a using directive or an assembly reference?)
Type `System.Collections.Generic.IEnumerable<string>' does not contain a member `Contains' and the best extension method overload `System.Linq.Queryable.Contains<object>(this System.Linq.IQueryable<object>, object)' has some invalid arguments
Extension method instance type `System.Collections.Generic.IEnumerable<string>' cannot be converted to `System.Linq.IQueryable<object>'

有没有一种简单的方法来获取两个异构列表的交集？

Answer 1

你可以使用Enumerable.Join:

var intersecting = from game in allLots
                   join realProp in soldRealProperties
                   on game.m_lotName equals realProp.m_name
                   select game.m_lot;
List<Lot> soldLots = intersecting.ToList();