[英]Query - Full outer join 2 different tables in a Dataset - LINQ C#
我想從兩個不同的表進行聯接(它們之間沒有連接):
停車場 (parkingLotID,addressParkingLot,statusParkingLot)
PublicParking (publicParkingID,地址PublicParking,statusParking)。
我想寫一個查詢,根據其狀態(停車場和PublicParking)返回所有可用的停車場。
我讀過我需要做完整的外部聯接(創建一個大表),只有這樣我才能編寫查詢。
我需要在LINQ中編寫查詢。
我真的需要您提供有關此查詢和完整外部聯接的幫助(如果正確的話)
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
我寫了查詢,但是有一個問題:
您可以使用Union
來聯接兩個表而無需公共字段。 您的方案的LINQ查詢將如下所示。
(from lot in ParkingLots
where lot.StatusParkingLot == true
select lot).Union( from pub in PublicParkings
where pub.StatusParking==true
select pub);
希望這有效!
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