C # : 如何将一个对象列表转换为该对象的单个属性列表？

假设我有:

IList<Person> people = new List<Person>();

而 person 对象具有类似 FirstName、 LastName 和 Sex 的属性。

如何将其转换为 Person 对象的属性列表。例如，一个名字列表。

IList<string> firstNames = ???
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小开 
firstNames = (from p in people select p=>p.firstName).ToList();
小开
最佳答案 
List<string> firstNames = people.Select(person => person.FirstName).ToList();

还有分类

List<string> orderedNames = people.Select(person => person.FirstName).OrderBy(name => name).ToList();
小开 
IList<string> firstNames = (from person in people select person.FirstName).ToList();

或者

IList<string> firstNames = people.Select(person => person.FirstName).ToList();
小开 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace TestProject
{
public partial class WebForm3 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
SampleDataContext context = new SampleDataContext();
List<Employee> l = new List<Employee>();
var qry = from a in context.tbl_employees where a.Gender=="Female"
orderby  a.Salary ascending
select new Employee() {
ID=a.Id,
Fname=a.FName,
Lname=a.Lname,
Gender=a.Gender,
Salary=a.Salary,
DepartmentId=a.DeparmentId
};
l= qry.ToList();
var e1 =  from  emp in context.tbl_employees
where emp.Gender == "Male"
orderby emp.Salary descending
select  emp;
GridView1.DataSource = l;
GridView1.DataBind();
}
}
public class Employee
{
public Int64 ID { get; set; }
public String Fname { get; set; }
public String Lname { get; set; }
public String Gender { get; set; }
public decimal? Salary { get; set; }
public int? DepartmentId { get; set; }
}
}
小开 
using System.Collections.Generic;
using System.Linq;


IList<Person> people = new List<Person>();
IList<string> firstNames = people.Select(person => person.FirstName).ToList();
小开

这将把它变成一个列表:

List<string> firstNames = people.Select(person => person.FirstName).ToList();

这将返回一个(第一个) :

var firstname = people.select(e => e.firstname).FirstOrDefault();

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