using System;

using System.Text.Json;

​

public class Program

{

    public static void Main()

    {

        var responseError = Response<HelloWorld>.FromError("Survey not configured");

        var responseNotFound = Response<HelloWorld>.FromNotFound("1");

​

        Console.WriteLine("In case of 400 ---");

​

        Console.WriteLine(JsonSerializer.Serialize(responseError, new JsonSerializerOptions { WriteIndented = true }));

        Console.WriteLine("\n In case of 404 --- \n ");

        Console.WriteLine(JsonSerializer.Serialize(responseNotFound, new JsonSerializerOptions { WriteIndented = true }));

    }

​

    public class Response<T>

    {

        public int StatusCode {get;set;}

        public string Error { get; set; }

​

        public static Response<T> FromError(string errorReason)

        {

            return new Response<T>{Error = typeof(T).Name + " has generated an error : " + errorReason + ".", StatusCode =  400};

        }

        public static Response<T> FromNotFound(string id)

        {

            return new Response<T>{Error = typeof(T).Name + " with ID : " + id + " is not found.", StatusCode =  404};

        }

    }

​

    public class HelloWorld

    {

        public string Hello { get; init; } = "Hello";

        public string World { get; init; } = "World!";

    }

}