using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

         var nonValueObject = new ApiResponseNonValue()

        {

            Messages = new List<string>

            {

                "I am a non type api response."

            }

        };

​

        var valueObject = new ApiResponseWithValue<int>()

        {

            Messages = new List<string>

            {

                "I am a value type api response."

            }

        };

        WriteLine(nonValueObject);

        WriteLine(valueObject);

    }

    public static void WriteLine<T>(T value)

    {

        if (value is IApiResponse response)

            Console.WriteLine(string.Join(',', response.Messages));

    }

}

​

​

public class ApiResponseNonValue

    : IApiResponse

{

    public List<string> Messages { get; set; }

    public List<string> Errors { get; set; }

}

​

public class ApiResponseWithValue<T>

    : IApiResponse<T>

{

    public List<string> Messages { get; set; }

    public List<string> Errors { get; set; }

​

    /// <summary>

    /// Gets or sets Data

    /// </summary>

    public T Data { get; set; }

}

​

public interface IApiResponse

{

    /// <summary>

    /// Gets or sets Messages

    /// </summary>

    public List<string> Messages { get; set; }

​

    /// <summary>

    /// Gets or sets Errors

    /// </summary>

    public List<string> Errors { get; set; }

}

​

public interface IApiResponse<T>

    : IApiResponse

{

    /// <summary>

    /// Gets or sets Data

    /// </summary>

    public T Data { get; set; }

}