[C#/LINQ/.NET6] Expression<T> 클래스 : 객체 속성 정보 구하기

TestProject.zip

0.00MB

▶ Product.cs

namespace TestProject;

/// <summary>
/// 제품
/// </summary>
public class Product
{
    //////////////////////////////////////////////////////////////////////////////////////////////////// Property
    ////////////////////////////////////////////////////////////////////////////////////////// Public

    #region 제품 코드 - ProductCode

    /// <summary>
    /// 제품 코드
    /// </summary>
    public string ProductCode { get; set; }

    #endregion
    #region 명칭 - Name

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

    #endregion
    #region 가격 - Price

    /// <summary>
    /// 가격
    /// </summary>
    public decimal Price { get; set; }

    #endregion
}

 

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▶ PropertyHelper.cs

using System.Linq.Expressions;
using System.Reflection;

namespace TestProject;

/// <summary>
/// 속성 헬퍼
/// </summary>
/// <typeparam name="TSource">소스 타입</typeparam>
public static class PropertyHelper<TSource>
{
    //////////////////////////////////////////////////////////////////////////////////////////////////// Method
    ////////////////////////////////////////////////////////////////////////////////////////// Static
    //////////////////////////////////////////////////////////////////////////////// Public

    #region 속성 정보 구하기 - GetPropertyInfo<TProperty>(selector)

    /// <summary>
    /// 속성 정보 구하기
    /// </summary>
    /// <typeparam name="TProperty">속성 타입</typeparam>
    /// <param name="selector">셀렉터</param>
    /// <returns>속성 정보</returns>
    public static PropertyInfo GetPropertyInfo<TProperty>(Expression<Func<TSource, TProperty>> selector)
    {
        Expression body = selector;

        if(body is LambdaExpression)
        {
            body = ((LambdaExpression)body).Body;
        }

        switch(body.NodeType)
        {
            case ExpressionType.MemberAccess : return (PropertyInfo)((MemberExpression)body).Member;
            default                          : throw new InvalidOperationException();
        }
    }

    #endregion
}

 

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▶ Program.cs

using System.Reflection;

namespace TestProject;

/// <summary>
/// 프로그램
/// </summary>
class Program
{
    //////////////////////////////////////////////////////////////////////////////////////////////////// Method
    ////////////////////////////////////////////////////////////////////////////////////////// Static
    //////////////////////////////////////////////////////////////////////////////// Private

    #region 프로그램 시작하기 - Main()

    /// <summary>
    /// 프로그램 시작하기
    /// </summary>
    private static void Main()
    {
        Product product = new Product { ProductCode = "0001", Name = "제품A", Price = 25_000 };

        PropertyInfo propertyInfo = PropertyHelper<Product>.GetPropertyInfo(x => x.Name);

        Console.WriteLine(propertyInfo.GetValue(product));
    }

    #endregion
}