请求数据未从视图传递到 Controller

Question

I have a view That Posts data as follows (image from fiddler request) Request Body

and I am accepting it in the action as follows:

public ActionResult AddProblem(Problem newproblem, string submit)
{
            //  Validating Saving the problem in the database 
            // part of it as follows
            if (ModelState.IsValid)
            {
                decimal TotalValue = 0M;
                foreach (var req in newproblem.Requireds) // This Line Throws a Null Reference Only in Production
                {
                    TotalValue += req.Value;
                }
            // rest of the code 
}

I am testing locally and everything is fine yet the published code gives me a null reference exception when I access the Requireds in the model passed from the view

my models are like this

    public class Problem
    {
        public Problem()
        {
            generalInformation = new GeneralQuestion();
            Requireds = new List<ProblemRequired>();
        }
        public GeneralQuestion generalInformation { get; set; }
        public List<ProblemRequired> Requireds { get; set; }
        public int Id { get; set; }
        [Display(Name = "Problem Text")]
        [Required]
        public string Text { get; set; }
        public decimal TotalMark { get; set; }
    }
    public class ProblemRequired
    {
        [Required]
        public string Text { get; set; }
        public string Status { get; set; }
        [Required]
        public string SolutionKey { get; set; }
        public int Order { get; set; }
        [Required]
        [Display(Name = "Question Mark")]
        [Range(0.01, 100.00, ErrorMessage = "Please enter a correct mark")]
        public decimal Value { get; set; }
        [Required]
        public decimal CorrectAnswer  { get; set; }
        [Required]
        public int CorrectNotation { get; set; }
        [Required]
        public string Unit { get; set; }
    }

Any Idea Why is the data not passed to the action method only in production?

Answer 1

without seeing your "View page" I'm guessing you are not binding the request body. try these changes.

[HttpPost, ActionName("AddProblem")]
public ActionResult AddProblem([FromBody]Problem newproblem, string submit)