Unable to Send Data From View To controller Action .NET MVC

Question

Just sending a int Data from View To Controller Action. but the controller action is not receiving that int data/ cannot map that int data.

my controller =>

    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult ConfirmNewBatchRequest(int? id)
    {
        if ((id?? 0) == 0)
        {
            return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
        }

        Studentassignbatche ConfirmStudentassignbatche = db.Studentassignbatches.Find(id);
        Batche FindBatche = db.Batches.Find(ConfirmStudentassignbatche.batch_code);

        if (ConfirmStudentassignbatche == null)
        {
            return HttpNotFound();
        }

        ConfirmStudentassignbatche.StatusCode = 1;
        db.Financeofstudents.Add(new Financeofstudent()
        {
            UserId = ConfirmStudentassignbatche.UserId,
            batch_code = ConfirmStudentassignbatche.batch_code,
            debit = FindBatche.amount,
            credit = 0,
            balance = FindBatche.amount,
            lastTrunsaction = DateTime.Now,
            entry_date = DateTime.Now
        });
        TryUpdateModel(ConfirmStudentassignbatche, new string[] { "StatusCode" });
        db.SaveChanges();

        TempData["BatchConfirmSuccess"] = "Success";
        return RedirectToAction("Index");
    }

and my view =>

    @using Something
    @model IEnumerable<Studentassignbatche>

    @{
        ViewBag.Title = "Confirm New Batch Request From Student";
        IEnumerable<Course> CoursesTable = TempData["Courses"] as IEnumerable<Course>;
        IEnumerable<UserDetail> UserDetailTable = TempData["UserDetails"] as IEnumerable<UserDetail>;
    }

    @section PageDescription{
        <section class="content-header">
            <h1>
                @ViewBag.Title
                <small>Tsms-admin</small>
            </h1>
        </section>
    }

    &nbsp;

    <div class="table-responsive">
        <table class="table table-striped table-inverse table-bordered">
            <tr>
                <th>#</th>
                <th>
                    @Html.DisplayNameFor(model => model.UserId)
                </th>
                <th>
                    @Html.Label("Student Name")
                </th>
                <th>
                    @Html.DisplayNameFor(model => model.batch_code)
                </th>
                <th>
                    @Html.DisplayNameFor(model => model.name)
                </th>
                <th>
                    @Html.Label("Vendor Name")
                </th>
                <th>
                    @Html.DisplayNameFor(model => model.adding_date)
                </th>
                <th></th>
            </tr>
            @{
                int counter = 1;
            }
            @foreach (var item in Model)
            {
                <tr>
                    <td>
                        @counter
                    </td>
                    <td>
                        @Html.DisplayFor(modelItem => item.UserId)
                    </td>
                    <td>
                        @{
                            var UserDetailsId = UserDetailTable.Where(x => x.UserId == item.UserId).Select(x => x.id).FirstOrDefault();
                            var name = UserDetailTable.Where(x => x.UserId == item.UserId).Select(x => x.fullname).FirstOrDefault();
                        }
                        @Html.ActionLink(name, "Details", "Students", new { id = UserDetailsId }, null)
                    </td>
                    <td>
                        @Html.ActionLink(item.batch_code, "Details", "Batche", new { id = item.batch_code }, null)
                    </td>
                    <td>
                        @Html.ActionLink(item.name, "Details", "Course", new { id = item.name }, null)
                    </td>
                    <td>
                        @{
                            var vendorname = CoursesTable.Where(x => x.name == item.name).Select(x => x.vendor_heading).FirstOrDefault();
                        }
                        <label style="font-weight:normal !important">@vendorname</label>
                    </td>
                    <td>
                        @Html.DisplayFor(modelItem => item.adding_date)
                    </td>
                    <td style="width:100px;">
                        @using (Html.BeginForm())
                        {
                            @Html.AntiForgeryToken()
                            @Html.HiddenFor(modelitem => item.id)

                            <div class="form-actions no-color">
                                <input type="submit" value="Confirm" class="btn btn-success" /> 
                            </div>
                        }
                    </td>
                </tr>
                counter++;
            }
        </table>
    </div>

The rendered form inside the loop looks like this:

<form action="/Admin/ConfirmNewBatchRequest" method="post"> 
  <input name="__RequestVerificationToken" type="hidden" value="K4GmhPUCkcqqclPtxW7F1YpiT_6mQBBZu7Wi8JtfQDMWdmCPMQsbj‌​Bfmtr9t8pSBrOV6Yixhh‌​tz0B-OfMtxj4Y8dOwrdR‌​BXlz9v0sD7O8YE1" />
  <input data-val="true" data-val-number="The field id must be a number." data-val-required="The id field is required." id="item_id" name="item.id" type="hidden" value="3" /> 
  <div class="form-actions no-color"> 
    <input type="submit" value="Confirm" class="btn btn-success" /> 
  </div> 
</form>

and here is how my model binds with the view =>

public class Studentassignbatche
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int id { get; set; }
    /// <summary>
    /// ////////
    /// </summary>
    [Required(AllowEmptyStrings = false, ErrorMessage = "User Id Is Required!")]
    [MaxLength(12, ErrorMessage = "The Max length Of User ID is 12 Character!")]
    [RegularExpression("[1-3]{2}-[0-9]{5}-[123]{1}|[1-3]{2}-[0-9]{7}-[123]{1}", ErrorMessage = "Invalid Id,It should [xx]-[xxxxx]-[x] or [xx]-[xxxxxxx]-[x]!")]
    [Display(Name = "User ID")]
    public string UserId { get; set; }
    /// <summary>
    /// /////////
    /// </summary>
    [Required(AllowEmptyStrings = false, ErrorMessage = "Course Name Is Required!")]
    [MaxLength(700, ErrorMessage = "The Max Length For Course Name Is 700 Character!")]
    [Display(Name = "Course Name")]
    public string name { get; set; }
    /// <summary>
    /// /////////
    /// </summary>
    [Required(AllowEmptyStrings = false, ErrorMessage = "Batch Code Is Required!")]
    [MaxLength(700, ErrorMessage = "The Max Length For Batch Code Is 700 Character!")]
    [Display(Name = "Batch Code")]
    public string batch_code { get; set; }
    /// <summary>
    /// ///////
    /// </summary>
    [Required(AllowEmptyStrings = false, ErrorMessage = "Status Is Required!")]
    [RegularExpression("^(?:complete|Complete|in progress|In progress)$", ErrorMessage = "Invalid Status!")]
    [Display(Name = "Current Status")]
    public string status { get; set; }
    /// <summary>
    /// ////////
    /// </summary>
    [Display(Name = "Course Completion Date")]
    [DataType(DataType.DateTime,ErrorMessage="Invalid Date!")]
    public Nullable<DateTime> completion_date { get; set; }

    [Display(Name="Date Of Addition")]
    [DataType(DataType.DateTime,ErrorMessage="Invalid Date!")]
    public DateTime adding_date { get; set; }
    /// <summary>
    /// /////////
    /// </summary>
    [RegularExpression("^[01]{1}$", ErrorMessage = "Invalid Status Code!")]
    [Required(ErrorMessage="Status Code Is Required!")]
    public int StatusCode { get; set; }

    //relationship with anothere  table------

    [ForeignKey("UserId")]
    public User User { get; set; }
    /// <summary>
    /// //////
    /// </summary>
    [ForeignKey("name")]
    public Course Course { get; set; }
    /// <summary>
    /// ///////
    /// </summary>
    [ForeignKey("batch_code")]
    public Batche Batche { get; set; }
}

and on controller when I debug I found out that => and i try using =>

    public ActionResult ConfirmNewBatchRequest(Studentassignbatche Studentassignbatche)
    {
        if (Studentassignbatche == null)
        {
            return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
        }
    }

but on debut it is still showing me a null object .

why this is happening because in view side it can generate more than one <form></form>. but as far as I can understand if the view generate more than one <form></form> still every form will get one hidden input field. and when the form will submit it will that particular hidden field which is associated with that <form>. Or One thing my URL look like http://localhost:43847/Admin/ConfirmNewBatchRequest is there any problem with URL ? Then why this problem is arising, and How to get rid of that problem.

Answer 1

The problem is that your form and your postback method don't match.

In your form, the rendered hidden field's name is item.id. However, your action method expects simply a single int called id. The form will submit it as if id is part of an object called item.

The HTML helper you've used to render the field is designed for when you want to post back the whole model, not just one field - i.e. in that case your action method would have to accept an object of type Studentassignbatche.

To fix this, you can use the simpler version of the HiddenField helper:

@Html.Hidden("id", item.id)

This should render something like:

<input name="id" type="hidden" value="3" />

which will mean that the name matches the name expected by your action method.