The form throws this exception when a User has Department. View with form:

@model DMDPace.DataAccess.DomainModels.User;

    @(Html.Kendo().Form<User>()
        .Name("User")
        .HtmlAttributes(new { action = "/Directory/User_Update", method = "POST" })
        .Layout("grid")
        .Grid(g => g.Cols(12).Gutter(20))
        .Items(i =>
        {
            i.Add().Field(e => e.DepartmentId).Label("Отдел").Editor(e => e.DropDownList()
                .DataTextField("Name")
                .DataValueField("Id")
                .DataSource(s =>
                {
                    s.Read(r => r.Action("GetDepartments", "Home"));
                }));
        }))

When I comment form code, it runs without errors.

User:

    public class User : Entity
    {
        public int? DepartmentId { get; set; }
        public Department Department { get; set; }
    }

Department:

public class Department : Entity
    {
        public virtual List<User> Users { get; set; }
    }

Startup:

services.AddControllers().AddNewtonsoftJson(options =>
            {
                options.SerializerSettings.ContractResolver = new DefaultContractResolver();
                options.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
            });

Endpoint which returns view:

        [HttpGet("[controller]/User/{Id:int}")]
        public async Task<IActionResult> UserView(int id)
        {
            var entity = await _userObjectService.GetAll()
                .Include(e => e.Department)
                .Where(e => e.Id == id)
                .FirstOrDefaultAsync();

            return View("User", entity);
        }
 
Telerik version - 2022.1.301.

I have a dropdown editor in the partial view:

@(Html.Kendo().DropDownListFor(m => m.DepartmentId)
    .DataTextField("Name")
    .DataValueField("Id")
    .DataSource(source =>
    {
        source.Read(read =>
        {
            read.Action("GetDepartments", "Home");
        });
    })
    )

Which I use in grid by specifying partial view's file name:

 .EditorTemplateName("Department")

I have reached my wits end trying to figure out why my Kendo UI ListView will not display the data when using a very simple template.  The ListView is based on a IEnumerable Model.  I'm very frustrated at this point.  No errors in f12.  The template just does not display.  Checking in debugger the data is all there and the model passed back as Json to the view is populated.  I have triple checked the field names match in the template and model.

Update:  One more bit of info...even if the template is a simple thing like this it STILL does not show:

Relevant View Code:

<script id="templateTest" type="text/x-kendo-tmpl">
    <div>Accounts:</div>
    <div class="product-view k-widget">
        <dl>
            <dt>Bank Name</dt>
            <dd>#:BankName#</dd>
        </dl>
    </div>
</script>


@(Html.Kendo().ListView<PayrollAccountModel>()
    .Name("listViewTest")
    .AutoBind(false)
    .TagName("div")
    .ClientTemplateId("templateTest")
    //.ClientTemplateHandler("templateTest")
    .DataSource(dataSource => dataSource
        .Ajax()
        .Model(model => model.Id("Id"))
        .Create(create => create.Action("PayrollAccount_Create", "DirectDeposit"))
        .Read(read => read.Action("PayrollAccount_Read", "DirectDeposit"))
        .Update(update => update.Action("PayrollAccount_Update", "DirectDeposit"))
        .Destroy(destroy => destroy.Action("PayrollAccount_Destroy", "DirectDeposit"))
    )
    .Editable().Deferred()
    )

Relevant Controller Code:

DirectDepositController:

Any help would be hugely appreciated!

Thanks

Hello i am using Oracle Database and have a model  called CableView Model  that i pass to grid  and CableInfoID is my  intended  id for the grid. I have issues updating grid data as always it returning 0 instead of a value.What am i doing wrong?

grid code

 public class CableViewModel

    {
        [ScaffoldColumn(false) ]
        public int CableInfoID { get; set; }



        [Required]
        [DisplayName("Cable ID")]
        public string CableId { get; set; }


        [Required]
        [DisplayName("Switch Name")]
        public string SwitchName { get; set; }

        [Required]
        [DisplayName("Port")]
        public string Port { get; set; }

        [ScaffoldColumn(false)]
        public string ToolID { get; set; }
        //public int ?ToolRecID { get; set; }
        [ScaffoldColumn(false)]
        public int ToolRecID { get; set; }

        [UIHint("_AdminEmp")]
        [Required]
        [DisplayName("Technician Assigned")]
        public string TechnicianAssigned { get; set; }

        [DisplayName("Available IP")]
        public string AvailableIp { get; set; }

        [DisplayName("Subnet Mask")]
        public string SubnetMask { get; set; }

        [DisplayName("Gateway")]
        public string Gateway { get; set; }
        public string Comments { get; set; }
    }

i have  update method as follows ..please ignore other fields as i am returning from view or grid..

Everytime i try to update  the grid row the CableInfoID is 0 

  public ActionResult Cables_Update([DataSourceRequest] DataSourceRequest request, CableViewModel product, int ToolRecID, string toolID, string Empltext)
        {
            if (ModelState.IsValid && product != null)
            {

                // Create a new Product entity and set its properties from the posted ProductViewModel.
                var entity = new DiIpmsCableTeamCableInfo
                {
                    RecordId = product.CableInfoID,
                    CableId = product.CableId,
                    SwitchName = product.SwitchName,
                    Port = product.Port,
                    TechnicianAssigned = Empltext,
                    ToolId = product.ToolID,
                    ToolRecId = ToolRecID,
                    AvailableIp=product.AvailableIp,
                    SubnetMask=product.SubnetMask
                };

                // Attach the entity.
                _db.DiIpmsCableTeamCableInfos.Attach(entity);
                // Change its state to Modified so Entity Framework can update the existing product instead of creating a new one.
                _db.Entry(entity).State = EntityState.Modified;
                // Or use ObjectStateManager if using a previous version of Entity Framework.
                // northwind.ObjectStateManager.ChangeObjectState(entity, EntityState.Modified);
                // Update the entity in the database.
                _db.SaveChanges();

            }

            // Return the updated product. Also return any validation errors.
            return Json(new[] { product }.ToDataSourceResult(request, ModelState));
        }

In the grid  update method 

When I add input for Id as said here https://docs.telerik.com/aspnet-core/html-helpers/layout/form/hidden-fields

i.Add().Field(f => f.Id).Editor(e => e.Hidden());

I got this text on my

Id:
hidden

How to get rid of it?

Also, I don't see input in the DOM tree, how Id will be transferred to the server?

I have a button which opens a window in a razor-page.

The first time I click the button, everything works fine. But when I close the window and click the same button again, the window is not opening.

The button and the window are nested inside a TabStrip.

This is the code for the button and the window:

<div id="tabVoucher">
      <button type="button" id="btnAddVoucher" class="btn btn-default">Create New</button>
      @(
        Html.Kendo().Window()
          .Name("winAddVoucher")
          .Animation(a =>{
            a.Open(o => o.Expand(ExpandDirection.Vertical));
          })
          .Draggable()
          .Actions(ac => ac
            .Minimize()
            .Maximize()
            .Close()
          )
          .Content(@<form method="post" class="needs-validation" novalidate>
            <div class="row">
              <div class="col-12">
                <label for="txbCode" class="form-label">Code</label>
                <input type="text" id="txbCode" class="form-control" required/>
              </div>
            </div>
            <div class="row">
              <div class="col-12">
                <label for="txbFrom" class="form-label">From</label>
                @(Html.Kendo().DateTimePickerFor(d => d.NewVoucher.ValidFrom).ComponentType("modern").HtmlAttributes(new { id = "txbFrom" }).Deferred())
              </div>
            </div>
            <div class="row">
              <div class="col-12">
                <label for="txbTill" class="form-label">Till</label>
                @(Html.Kendo().DateTimePickerFor(d => d.NewVoucher.ValidTill).ComponentType("modern").HtmlAttributes(new { id = "txbTill" }).Deferred())
              </div>
            </div>
            <div class="row mt-3">
              <button type="submit" class="btn btn-default">Create</button>
            </div>
          </form>)
          .Visible(false)
          .Deferred()
      )
    </div>

$(document).ready(function () {
      $('#btnAddVoucher').click(function(e){
        $('#winAddVoucher').data('kendoWindow').open();
      });
    });