[c#] C # : 개체 목록을 해당 개체의 단일 속성 목록으로 변환하는 방법은 무엇입니까?

Program / 글쓴이

내가 가지고 있다고 :

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

그리고 person 개체에는 FirstName, LastName 및 Gender와 같은 속성이 있습니다.

이것을 Person 객체의 속성 목록으로 어떻게 변환 할 수 있습니까? 예를 들어, 이름 목록에.

IList<string> firstNames = ???

답변

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

그리고 정렬

List<string> orderedNames = people.Select(person => person.FirstName).OrderBy(name => name).ToList();

답변

IList<string> firstNames = (from person in people select person.FirstName).ToList();

또는

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

답변

firstNames = (from p in people select p=>p.firstName).ToList();

답변

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; }
    }
}

답변

using System.Collections.Generic;
using System.Linq;

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

답변