[英]Query - Full outer join 2 different tables in a Dataset - LINQ C#
我想从两个不同的表进行联接(它们之间没有连接):
停车场 (parkingLotID,addressParkingLot,statusParkingLot)
PublicParking (publicParkingID,地址PublicParking,statusParking)。
我想写一个查询,根据其状态(停车场和PublicParking)返回所有可用的停车场。
我读过我需要做完整的外部联接(创建一个大表),只有这样我才能编写查询。
我需要在LINQ中编写查询。
我真的需要您提供有关此查询和完整外部联接的帮助(如果正确的话)
using System;
using System.Linq;
using System.Collections.Generic;
public class Program
{
public static void Main()
{
IList<parkingLot> parkingLot=new List <parkingLot>(){
new parkingLot {parkingLotID=1, addressParkingLot="bograshov 22",statusParkingLot=true},
new parkingLot {parkingLotID=2, addressParkingLot="bograshov 10",statusParkingLot=false},
new parkingLot {parkingLotID=3, addressParkingLot="bograshov 28",statusParkingLot=true},
};
IList<publicParking> PublicParking=new List <publicParking>(){
new publicParking {publicParkingID=101, addressPublicParking= "bograshov 23",statusParking=true},
new publicParking {publicParkingID=102, addressPublicParking= "bograshov 21",statusParking=true},
new publicParking {publicParkingID=103, addressPublicParking= "bograshov 18",statusParking=false},
};
(from lot in parkingLot
where lot.statusParkingLot == true
select lot).Union(from pub in PublicParking
where pub.statusParking==true
select pub);
}
}
public class publicParking
{
public int publicParkingID { get; set; }
public string addressPublicParking { get; set; }
public bool statusParking { get; set; }
}
public class parkingLot
{
public int parkingLotID { get; set; }
public string addressParkingLot { get; set; }
public bool statusParkingLot { get; set; }
}
TNX!
UPDATE
我写了查询,但是有一个问题:
您可以使用Union
来联接两个表而无需公共字段。 您的方案的LINQ查询将如下所示。
(from lot in ParkingLots
where lot.StatusParkingLot == true
select lot).Union( from pub in PublicParkings
where pub.StatusParking==true
select pub);
希望这有效!
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