CodeGo.net>如何使用LINQ通过主键组合三个对象列表
作者:互联网
我正在尝试合并3个对象列表.我有一个人员列表,地址列表和一个addressRelation列表.
我想将这些列表合并到person.id排序的新列表中,将其用作listview的数据源,然后能够访问aspx页面中的属性.
这可能吗?
解决方法:
大致
using System.Linq;
class Person
{
public int Id;
public string Name;
}
class Address
{
public int Id;
public string Street;
}
class PersonAddress
{
public int PersonId, AddressId;
}
public class Program
{
public static void Main(string[] args)
{
var personList = new []
{
new Person { Id = 1, Name = "Pete" },
new Person { Id = 2, Name = "Mary" },
new Person { Id = 3, Name = "Joe" }
};
var addressList = new []
{
new Address { Id = 100, Street = "Home Lane" },
new Address { Id = 101, Street = "Church Way" },
new Address { Id = 102, Street = "Sandy Blvd" }
};
var relations = new []
{
new PersonAddress { PersonId = 1, AddressId = 101 },
new PersonAddress { PersonId = 3, AddressId = 101 },
new PersonAddress { PersonId = 2, AddressId = 102 },
new PersonAddress { PersonId = 2, AddressId = 100 }
};
var joined =
from par in relations
join p in personList
on par.PersonId equals p.Id
join a in addressList
on par.AddressId equals a.Id
select new { Person = p, Address = a };
foreach (var record in joined)
System.Console.WriteLine("{0} lives on {1}",
record.Person.Name,
record.Address.Street);
}
}
输出:
Pete lives on Church Way
Mary lives on Sandy Blvd
Mary lives on Home Lane
Joe lives on Church Way
标签:data-binding,linq-to-objects,asp-net,c 来源: https://codeday.me/bug/20191102/1990219.html