.NET Core [FromBody] annotation assigns default value instead of returning 400 error if value is mis-CodePudding

I have created a controller method similar to

[HttpPost]
public ActionResult<MyDTO> Post([FromBody] MyDTO myDTO)
{
    // do something with myDTO...
    Ok();
}

and MyDTO:

namespace MyNamespace.DTO
{
    public class MyDTO
    {
        [Required]
        public int someNumber { get; set; }

        [Required]
        public bool someBool { get; set; }

        [Required]
        public DateTimeOffset someDate { get; set; }
    }
}

When I send a post with a JSON body that doesn't have either defined, instead of returning a 400 or an exception of some sort, it just assigns default (falsy) values to them.

When I defined a List of another DTO class, it did return a 400 code.

How can I make the API return an error when certain required values are not provided instead of just using default values?

CodePudding user response：

You have to manually control it. There's no other way.

Try something like

[HttpPost]
public ActionResult<MyDTO> Post([FromBody] MyDTO myDTO)
{
    if(YourComprobation(myDto)){
       BadRequest();
    }
    Ok();
}

CodePudding user response：

Found an answer here.

I just had to make all the fields nullable and have a

if (!ModelState.IsValid)
   // return 400

in the controller.