Validate parameter type of Action and send custom BadRequest "The [Field] is not number"

Question

a Put Action is defined with a parameter type int and I need to respond a custom BadRequest message when a string is sent instead, this response should be only for one Controller

        [HttpPut("address")]
        [Authorize]
        [ProducesResponseType(typeof(Customer), 200)]
        [ProducesResponseType(typeof(Error), 400)]
        [ProducesResponseType(typeof(Error), 404)] //custom error
        [ProducesDefaultResponseType]
        public async Task<IActionResult> UpdateAddress(
            [Required] [FromForm] string email,
            [Required] [FromForm] string address_1,
                       [FromForm] string address_2,
            [Required] [FromForm] string city,
            [Required] [FromForm] string region,
            [Required] [FromForm] string postal_code,
            [Required] [FromForm] string country,
            [Required] [FromForm] int shipping_region_id //this is the parameter to validate
        )
        {
           //...
        }

the BadRequest (400) message should be : "The Shipping Region ID is not number" How I can validate the type before to reach the Controller and send a custom BadRequest object?

First its not a post request. second you can have model for post method instead parameter and where you can identify custom validater for each property in model. — Harshad Vekariya, Sep 19 '19 at 12:51
yes I would like to change to a model , but it was defined so — alvan, Sep 19 '19 at 13:12

score 2 · Answer 1 · answered Sep 19 '19 at 13:10

2

Use DTO for PUT request and pass your parameter like this.

public class UpdateAddressDTO
{
        [Required]
        public string email { get; set; }
        [Required]
        public string address_1 { get; set; }
        [Required]
        public string address_2 { get; set; }
        [Required]
        public string city { get; set; }
        [Required]
        public string region { get; set; }
        [Required]
        public string postal_code { get; set; }
        [Required]
        public string country { get; set; }
}

[Route("address/{shipping_region_id}/update")]
public async Task<IActionResult> UpdateAddress([FromUri]int shipping_region_id, [FromBody]UpdateAddressDTO model)
{

}

answered Sep 19 '19 at 13:10

awais

492
4
17

How the custom badrequest is sent? – alvan Sep 19 '19 at 13:15
@alvan ```return BadRequest("The Shipping Region ID is not a number");``` – awais Sep 19 '19 at 13:58
1

where? anyway I solved it using an ActionFilterAttribute like this: https://stackoverflow.com/a/53159746/5125093 – alvan Sep 19 '19 at 15:00
@alvan this can also be another way to do it. Glad you have found and it's working for you. Can you please mark my above solution as answer. – awais Sep 19 '19 at 15:55
sorry, but it was not helpful – alvan Sep 19 '19 at 21:08

Validate parameter type of Action and send custom BadRequest "The [Field] is not number"

1 Answers1