Example of a C# Asp.net core response envelope

response-envelope-example.cs

using System.Net;
using Microsoft.AspNetCore.Mvc;

namespace WidgetApi.Models
{
  internal class ResponseEnvelopeResult<T> : ObjectResult where T : class
  {
    /// <summary>
    /// Data envelope for wrapping responses
    /// </summary>
    /// <param name="statusCode">http status code to return</param>
    /// <param name="data">raw response data</param>
    /// <param name="error">friendly error string</param>
    public ResponseEnvelopeResult(HttpStatusCode statusCode = HttpStatusCode.OK, T data = null, object error = null) : base(new ResponseEnvelope<T>(data, error))
    {
      this.StatusCode = (int)statusCode;
    }
  }

  internal class ResponseEnvelope<T>  where T : class
  {

    public T Data { get; }
    public object Error { get; }

    public ResponseEnvelope(T data, object error)
    {
      Data = data;
      Error = error;
    }
  }
}