C# 合并项目时保留同级引用

我有航班和航段信息，我想有带航班号信息的笛卡尔航段：

class FlightSegment{
    public string FlightNumber {get;set;}
}

class Flight{
    public FlightSegment FlightSegment {get;set;}
    public List<string> FlightClass {get;set;}
}

class FlightSegmentAndFlight{
    public string FlightSegmentName {get;set;}
    public string FlightNumberName {get;set;}
}
static class Utils {
    //util for make cartesian of segments
    public static IEnumerable<IEnumerable<T>> CartesianItems<T>(this IEnumerable<IEnumerable<T>> sequences) {
        IEnumerable<IEnumerable<T>> emptyProduct =
          new[] { Enumerable.Empty<T>() };
        IEnumerable<IEnumerable<T>> result = emptyProduct;
        foreach (IEnumerable<T> sequence in sequences) {
            result = from accseq in result from item in sequence select accseq.Concat(new[] { item });
        }
        return result;
    }
}
void Main()
{
    var f1 = new Flight(){
        FlightSegment = new FlightSegment{FlightNumber = "FN1"},
        FlightClass =  new List<string> {"A1","B1"}
    };  
    var f2 = new Flight{
        FlightSegment = new FlightSegment{FlightNumber = "FN2"},
        FlightClass =  new List<string> {"A2","B2"}
    };  
    var flights = new List<Flight>{f1,f2};  
    var result = flights.Select(x => x.FlightClass).CartesianItems();
    Console.WriteLine(result);

}

---

在其中使用笛卡尔坐标

因为您只需要将航班号附加到航班等级，所以请使用匿名等级，如下所示：

public static void Main()
{
    var f1 = new Flight()
    {
        FlightSegment = new FlightSegment { FlightNumber = "FN1" },
        FlightClass = new List<string> { "A1", "B1" }
    };
    var f2 = new Flight
    {
        FlightSegment = new FlightSegment { FlightNumber = "FN2" },
        FlightClass = new List<string> { "A2", "B2" }
    };
    var flights = new List<Flight> { f1, f2 };
    var result = flights.Select(x => x.FlightClass.Select(fc => new {FlightClass = fc, FlightNumber = x.FlightSegment.FlightNumber })).CartesianItems();
    foreach (var item in result)
        Console.WriteLine(String.Join(" ", item.Select(c => c.FlightClass + " " + c.FlightNumber)));        
}

publicstaticvoidmain（）
{
var f1=新航班（）
{
FlightSegment=新的FlightSegment{FlightNumber=“FN1”}，
FlightClass=新列表{“A1”，“B1”}
};
var f2=新航班
{
FlightSegment=新的FlightSegment{FlightNumber=“FN2”}，
FlightClass=新列表{“A2”，“B2”}
};
var flights=新列表{f1，f2}；
var result=flights.Select（x=>x.FlightClass.Select（fc=>new{FlightClass=fc，FlightNumber=x.FlightSegment.FlightNumber}））.CartesianItems（）；
foreach（结果中的var项目）
Console.WriteLine（String.Join（“，item.Select（c=>c.FlightClass+”“+c.FlightNumber））；
}

可能只是“var result=flights.Select（x=>x.FlightClass.Select（fc=>new{FlightClass=fc，FlightNumber=x.FlightSegment.FlightNumber}”）。CartesianItems（）；”？因此，只需向每个类添加有关FlightNumber的信息。@Evk此功能：）请回答以下问题：var result=string.Join（“\n”，flights.Select（x=>x.FlightClass）。Select（x=>string.Format（“（x={0}；y={1}）”，x[0]，x[1]）。ToList（）；控制台写入线（结果）；

public static void Main()
{
    var f1 = new Flight()
    {
        FlightSegment = new FlightSegment { FlightNumber = "FN1" },
        FlightClass = new List<string> { "A1", "B1" }
    };
    var f2 = new Flight
    {
        FlightSegment = new FlightSegment { FlightNumber = "FN2" },
        FlightClass = new List<string> { "A2", "B2" }
    };
    var flights = new List<Flight> { f1, f2 };
    var result = flights.Select(x => x.FlightClass.Select(fc => new {FlightClass = fc, FlightNumber = x.FlightSegment.FlightNumber })).CartesianItems();
    foreach (var item in result)
        Console.WriteLine(String.Join(" ", item.Select(c => c.FlightClass + " " + c.FlightNumber)));        
}