How to localize exception message for Json deserialization? An invalid parameter was passed when requesting the interface？ - exception

Question

My development environment is.Net7 WebApi (out of the box)
Below is the relevant code. DataAnnotations I have implemented localization.
using System.ComponentModel.DataAnnotations;
namespace WebApi.Dtos
{
public class UserRegistrationDto
{
[Required(ErrorMessage = "UserNameRequiredError")]
[MinLength(6, ErrorMessage = "UserNameMinLengthError")]
[MaxLength(30, ErrorMessage = "UserNameMaxLengthError")]
public required string UserName { get; set; }
[Required(ErrorMessage = "PasswordRequiredError")]
public required string Password { get; set; }
}
}
[HttpPost]
public async Task<IActionResult> RegisterUser([FromBody] UserRegistrationDto userRegistration)
{
return Ok(1);
// IdentityResult userResult = await _userManager.CreateAsync(new IdentityUser { UserName = userRegistration.UserName }, userRegistration.Password);
// return userResult.Succeeded ? StatusCode(201) : BadRequest(userResult);
}
When the request body is invalid JSON.
curl -X 'POST' \
'https://localhost:7177/Authenticate/RegisterUser' \
-H 'accept: */*' \
-H 'Api-Version: 1.0' \
-H 'Content-Type: application/json' \
-d '{}'
{
"$": [
"JSON deserialization for type 'WebApi.Dtos.UserRegistrationDto' was missing required properties, including the following: userName, password"
],
"userRegistration": [
"The userRegistration field is required."
]
}
When the request body is Empty.
curl -X 'POST' \
'https://localhost:7177/Authenticate/RegisterUser' \
-H 'accept: */*' \
-H 'Api-Version: 1.0' \
-H 'Content-Type: application/json' \
-d ''
{
"": [
"The userRegistration field is required."
]
}
It throws exception information before binding to DTO, can this exception information be localized? If not, is it possible to capture this information for secondary processing, such as returning a fixed JSON format?
I've tried this in the Program.cs entry file, but it's not ideal.
.ConfigureApiBehaviorOptions(options =>
{
options.SuppressModelStateInvalidFilter = false;
options.InvalidModelStateResponseFactory = context =>
{
bool knownExceptions = context.ModelState.Values.SelectMany(x => x.Errors).Where(x => x.Exception is JsonException || (x.Exception is null && String.IsNullOrWhiteSpace(x.ErrorMessage) == false)).Count() > 0;
if (knownExceptions)
{
return new BadRequestObjectResult(new { state = false, message = localizer["InvalidParameterError"].Value });
}
// ...
return new BadRequestObjectResult(context.ModelState);
};
})
I have also tried this method, but I can’t capture the exception information that failed when binding DTO alone. They will appear together with the ErrorMessage exception information in DTO like the above writing method.
.AddControllers(options =>
{
// options.Filters.Add(...);
// options.ModelBindingMessageProvider // This doesn't work either, it seems to support [FromForm]
})
Back to the topic, can it be localized? Or there is something wrong with the code. I just learned .Net not long ago. Most of the information I learned came from search engines and official documents. Thanks in advance.

Answer 1

Use the following method.
.AddControllers(options =>
{
// options.ModelBindingMessageProvider.Set...
})
It seems that the exception of JSON deserialization caused by passing invalid parameters can only be eliminated on the client side. So far it seems I haven't found a localization for this exception, but it's not very important to me at the moment.
Thanks #XinranShen for helping point me in the right direction.