How to make a single response format for all api requests in asp.net core mvc?

Question

ASP.NET

Before, I used DelegatingHandler, and I could wrap all the responses from action into a beautiful object (with a status code, an error message and a result object ...). But I don’t understand how to implement this in the new asp.net (( Please tell me

Answer 1

More or less like this:

public class APIResult
{
        public int errorCode { get; set; }

        [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
        public string errorMessage { get; set; }

        [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
        public object messageData { get; set; }

        public APIResult(int errorCode, string errorMessage, object data)
        {
             this.errorCode = errorCode;
             this.errorMessage = errorMessage;
             messageData = data;
        }
}

public abstract class BaseAPIController : Controller
{
protected JsonResult ApiMessage(int errorCode, string errorMessage = null, object data = null)
{
   return Json(new APIResult(errorCode, errorMessage, data));
}
}
// И пример использования
public YourController: BaseAPIController
{
public async Task<IActionResult> YourAction(int id)
{
    return ApiMessage(0, data: new { id = id });
    // Или
   // return ApiMessage(-2, errorMessage: "Invalid request parameters");
}
}