我有这个课
public class FlightSegment{
public string ClassName { get;set;}
}
我想获得与普通FlightSegments
相同的ClassName
void Main()
{
var list1 = new List<FlightSegment>() {
new FlightSegment{ ClassName = "A"},
new FlightSegment { ClassName = "B"}
};
var list2 = new List<FlightSegment>() {
new FlightSegment{ ClassName = "B"},
new FlightSegment { ClassName = "C"}
};
var listOfLists = new List<List<FlightSegment>>() { list1, list2 };
var intersection = listOfLists.Aggregate((previousList, nextList) => previousList.Intersect(nextList).ToList());
Console.WriteLine(intersection); //Gives me empty result
}
我尝试过这样的事情:
var intersection = listOfLists.Aggregate((previousList, nextList) =>
previousList.Select(e=>e.ClassName).Intersect(nextList.Select(e=>e.ClassName)).ToList());
但给出错误:
Cannot convert expression type System.Collection.Generic.List<string> to return type System.Collection.Generic.List<FlightSegment>
参考方案
您可以使用Intersect方法传递IEqualityComparer以根据ClassName
属性进行比较:
class FlightComparer : EqualityComparer<FlightSegment>
{
public override bool Equals(FlightSegment x, FlightSegment y)
{
return x.ClassName == y.ClassName;
}
public override int GetHashCode(FlightSegment obj)
{
return obj.ClassName.GetHashCode();
}
}
然后,使用此比较器进行交点:
var list1 = new List<FlightSegment>() {
new FlightSegment{ ClassName = "A"},
new FlightSegment { ClassName = "B"}
};
var list2 = new List<FlightSegment>() {
new FlightSegment{ ClassName = "B"},
new FlightSegment { ClassName = "C"}
};
var result = list1.Intersect(list2, new FlightComparer());
这将返回仅包含一个元素FlightSegment { ClassName = "B" }
的集合。
使用这个想法和Aggregate,您可以基于属性获得一组列表的交集:
var intersection = listOfLists.Aggregate((previousList, nextList) => previousList.Intersect(nextList, new FlightComparer() ).ToList());
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