using System;

using System.Collections.Generic;

using System.Text.Json;

using System.Text.Json.Serialization;

​

public class Program

{

    public static void Main(String[] args)

    {

        //This you'll get as part of request

        var requestedColumns = new String[] { "ColumnD", "ColumnB" };

​

        //This is the response from service 

        var sampleResponse = new SampleResponse

        {

            ColumnA = "SomeValue",

            ColumnC = "AnotherValue",

            ColumnD = new AnotherType { Prop1 = "Somevalue" },

            ColumnB = 22

        };

        PagedResult<SampleResponse> pagedResult = new();

        pagedResult.Total = 10;

        pagedResult.Page = 1;

        pagedResult.Results.Add(sampleResponse);

        var finalResult = new PagedResult<Dictionary<string, Object>>();

        finalResult.Page = pagedResult.Page;

        finalResult.Total = pagedResult.Total;

        finalResult.Results = pagedResult.Results.FilterResults(requestedColumns);

        Console.WriteLine(JsonSerializer.Serialize(finalResult));

    }

​

    //This is your response view model Class 

    public class SampleResponse

    {

        public string ColumnA { get; set; }

        public int? ColumnB { get; set; }

        public string ColumnC { get; set; }

        public AnotherType ColumnD { get; set; }

    }

    public class AnotherType

    {

        public string Prop1 { get; set; }

    }

​

}

public static class ResultExtension

{

    public static List<Dictionary<string, Object>> FilterResults<T>(this IList<T> results, string[] propertiesToBeFitered)

    {

        List<Dictionary<string, Object>> filteredList = new();

        foreach(var result in results)

        {

            Dictionary<string, Object> mapping = new();

            foreach(var prop in propertiesToBeFitered)

            {

                var value = result.GetType().GetProperty(prop)?.GetValue(result);

                mapping.Add(prop, value);

            }

            filteredList.Add(mapping);

        }

        return filteredList;

    }

}

​

​

public class PagedResult<T> where T : class

    {

        public int Page { get; set; }

​

        public int Limit { get; set; }

​

        public int Total { get; set; }

​

        public IList<T> Results { get; set; }

​

        public PagedResult()

        {

            Results = new List<T>();

        }

    }

​

​

​