Array size validation in C#

I have a controller method with array of integers input, which must not be null or more than 10 elements size. To validate input I 've made a class:

public class TestForm
{
    [Required]
    [MaxLength(10)]
    public long[] feedIds { get; set; }
}

And controller method:

[HttpPost]
public async Task<IActionResult> DoSomeJob(TestForm form)
{
    //Do some job
}

According to MSDN, System.ComponentModel.DataAnnotations.MaxLength can be used for array, but there is no validation, it gets null and array of any size. What am I doing wrong?

Array size validation in C#

2 Answers