Tips and tricks

Dot.NET C# - Mock Custom Http Status Code response in IActionResult

Posted on April 19 2024 / in DotNET

Write this class


    public class CustomErrorResult : ActionResult
{
    private readonly string _message;
    private readonly int _statusCode;

    public CustomErrorResult(string message, int statusCode)
    {
        _message = message;
        _statusCode = statusCode;
    }

    public override void ExecuteResult(ActionContext context)
    {
        var response = context.HttpContext.Response;
        response.StatusCode = _statusCode;
        response.ContentType = "application/json";

        var result = JsonSerializer.Serialize(new { error = _message });
        response.WriteAsync(result);
    }
}

Then you can use it like so:

return new CustomErrorResult("Version number is missing", 427);