[C#/LINQ] Enumerable 클래스 : Select 확장 메소드 사용하기

■ Enumerable 클래스의 Select<TSource, TResult> 확장 메소드를 사용하는 방법을 보여준다.

▶ 예제 코드 (C#)


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

/// <summary>
/// 임직원
/// </summary>
class Employee
{
    //////////////////////////////////////////////////////////////////////////////////////////////////// Property
    ////////////////////////////////////////////////////////////////////////////////////////// Public

    #region 성명 - Name

    /// <summary>
    /// 성명
    /// </summary>
    public string Name { get; set; }

    #endregion

    #region 부서 - Department

    /// <summary>
    /// 부서
    /// </summary>
    public string Department { get; set; }

    #endregion

    #region 취미 배열 - HobbyArray

    /// <summary>
    /// 취미 배열
    /// </summary>
    public string[] HobbyArray { get; set; }

    #endregion

    //////////////////////////////////////////////////////////////////////////////////////////////////// Method
    ////////////////////////////////////////////////////////////////////////////////////////// Static
    //////////////////////////////////////////////////////////////////////////////// Public

    #region 임직원 리스트 구하기 - GetEmployeeList()

    /// <summary>
    /// 임직원 리스트 구하기
    /// </summary>
    /// <returns>임직원 리스트</returns>
    public static List<Employee> GetEmployeeList()
    {
        List<Employee> employeeList = new List<Employee>
        {
            new Employee { Name = "홍길동", Department = "영업부"      , HobbyArray = new string[] { "게임", "독서"     }},
            new Employee { Name = "황희"  , Department = "경리부"      , HobbyArray = new string[] { "수영", "영화감상" }},
            new Employee { Name = "정약용", Department = "신사업기획부", HobbyArray = new string[] { "등산", "DIY"      }}
        };

        return employeeList;
    }

    #endregion
}

...

List<Employee> employeeList = Employee.GetEmployeeList();

var result = employeeList.Select(employee => employee.HobbyArray);

foreach(string[] hobbyArray in result)
{
    foreach(string hobby in hobbyArray)
    {
        Console.WriteLine(hobby);
    }
}

/*
게임
독서
수영
영화감상
등산
DIY
*/

using System;

using System.Collections.Generic;

using System.Linq;

/// <summary>

/// 임직원

/// </summary>

class Employee

{

//////////////////////////////////////////////////////////////////////////////////////////////////// Property

////////////////////////////////////////////////////////////////////////////////////////// Public

#region 성명 - Name

/// <summary>

/// 성명

/// </summary>

public string Name { get; set; }

#endregion

#region 부서 - Department

/// <summary>

/// 부서

/// </summary>

public string Department { get; set; }

#endregion

#region 취미 배열 - HobbyArray

/// <summary>

/// 취미 배열

/// </summary>

public string[] HobbyArray { get; set; }

#endregion

//////////////////////////////////////////////////////////////////////////////////////////////////// Method

////////////////////////////////////////////////////////////////////////////////////////// Static

//////////////////////////////////////////////////////////////////////////////// Public

#region 임직원 리스트 구하기 - GetEmployeeList()

/// <summary>

/// 임직원 리스트 구하기

/// </summary>

/// <returns>임직원 리스트</returns>

public static List<Employee> GetEmployeeList()

{

List<Employee> employeeList = new List<Employee>

{

new Employee { Name = "홍길동", Department = "영업부" , HobbyArray = new string[] { "게임", "독서" }},

new Employee { Name = "황희" , Department = "경리부" , HobbyArray = new string[] { "수영", "영화감상" }},

new Employee { Name = "정약용", Department = "신사업기획부", HobbyArray = new string[] { "등산", "DIY" }}

};

return employeeList;

}

#endregion

}

...

List<Employee> employeeList = Employee.GetEmployeeList();

var result = employeeList.Select(employee => employee.HobbyArray);

foreach(string[] hobbyArray in result)

{

foreach(string hobby in hobbyArray)

{

Console.WriteLine(hobby);

}

게임

독서

수영

영화감상

등산

DIY