[Solved] Add new record: Object reference not set to an instance of an object

[sebrojas]

I got this error when I try to add a new record to my grid, at the final is the source code

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:

Line 41: <h2>Administración de Grupos</h2> Line 42: Line 43: <% Html.Telerik().Grid(Model)Line 44: .Name("Grid") Line 45: .DataKeys(keys =>

Source File: c:\Desarrollo\srojas\codigo\Maga\Maga\MagaSeguridadUI\Views\Grupos\Index.aspx    Line: 43

Stack Trace:

[NullReferenceException: Object reference not set to an instance of an object.] Telerik.Web.Mvc.UI.Grid`1.CreateBuilderFor(GridRow`1 row) +1742 Telerik.Web.Mvc.UI.GridHtmlBuilder`1.CreateRow(GridRow`1 row) +101 Telerik.Web.Mvc.UI.GridHtmlBuilder`1.AppendRows(IHtmlNode body, IEnumerable`1 dataSource) +331 Telerik.Web.Mvc.UI.GridHtmlBuilder`1.CreateBody() +572 Telerik.Web.Mvc.UI.GridHtmlBuilder`1.BuildCore() +594 Telerik.Web.Mvc.UI.HtmlBuilderBase.Build() +72 Telerik.Web.Mvc.UI.Grid`1.WriteHtml(HtmlTextWriter writer) +1134 Telerik.Web.Mvc.UI.ViewComponentBase.Render() +147 Telerik.Web.Mvc.UI.ViewComponentBuilderBase`2.Render() +55 ASP.views_grupos_index_aspx.__RenderContent2(HtmlTextWriter __w, Control parameterContainer) in c:\Desarrollo\srojas\codigo\Maga\Maga\MagaSeguridadUI\Views\Grupos\Index.aspx:43 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +109 System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +8 System.Web.UI.Control.Render(HtmlTextWriter writer) +10 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27 System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +100 System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25 ASP.views_shared_site_master.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in c:\Desarrollo\srojas\codigo\Maga\Maga\MagaSeguridadUI\Views\Shared\Site.Master:30 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +109 System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +8 System.Web.UI.Control.Render(HtmlTextWriter writer) +10 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27 System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +100 System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +208 System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +8 System.Web.UI.Page.Render(HtmlTextWriter writer) +29 System.Web.Mvc.ViewPage.Render(HtmlTextWriter writer) +56 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27 System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +100 System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3060

---

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1

View:

<% Html.Telerik().Grid(Model)
            .Name("Grid")
            .DataKeys(keys =>
            {
                keys.Add(g => g.GrupoID);
            })
            .ToolBar(commands => commands.Insert())
            .Columns((IEnumerable<GridColumnSettings>)ViewData["Columns"])
            .DataBinding(dataBinding => dataBinding.Server()
                .Select("Index", "Grupos")
                .Insert("Crear", "Grupos")
                .Update("Editar", "Grupos")
                .Delete("Eliminar", "Grupos"))
            .CellAction(cell =>
            {
                // "DataItem" is the Order object to which the current row is bound to
                if (cell.Column.Title == "Estado" && cell.DataItem.Estado != null)
                {
                    //Set the background of the entire row
                    if (cell.DataItem.Estado.EstadoID == 2)
                        cell.HtmlAttributes["style"] = "color:#CC0000;";
                    else
                        cell.HtmlAttributes["style"] = "color:green;";
                }
            })
            .DetailView(perfilesDetailView => perfilesDetailView.Template(g =>
            {
                %>
                    <% Html.Telerik().Grid(g.Perfiles)
                            .Name("Periles_" + g.GrupoID)
                            .DataKeys(keys =>
                            {
                                keys.Add(p => p.PerfilID);
                            })
                            .Columns(columns =>
                            {
                                columns.Bound(p => p.Aplicacion.Nombre);
                                columns.Bound(p => p.Estado);
                                columns.Bound(p => p.Nombre);
                                columns.Bound(p => p.Descripcion);
                            })
                            .CellAction(cell =>
                            {
                                // "DataItem" is the Order object to which the current row is bound to
                                if (cell.Column.Title == "Estado" && cell.DataItem.Estado != null)
                                {
                                    //Set the background of the entire row
                                    if (cell.DataItem.Estado.EstadoID == 2)
                                        cell.HtmlAttributes["style"] = "color:#CC0000;";
                                    else
                                        cell.HtmlAttributes["style"] = "color:green;";
                                }
                            })
                            .Pageable(settings => settings.Style(GridPagerStyles.NextPreviousAndNumeric))
                            .Sortable()
                            .Render();
                    %>
                <%
            }
            ))
            .RowAction(row =>
            {
                if (row.Index == 1)
                {
                    row.DetailRow.Expanded = true;
                }
            })
            .Pageable(settings => settings.Style(GridPagerStyles.NextPreviousAndNumeric))
            .Sortable()
            .Filterable()
            .Groupable()
            .Editable(editing => editing.Mode(GridEditMode.InLine))
            .Resizable(resizing => resizing.Columns(true))
            .Render();
    %>

Controller:

public ActionResult Index()
        {
            var columns = new[]
            {
                new GridColumnSettings
                {
                    Member = "Aplicacion",
                    Width = "130px"
                },
                new GridColumnSettings
                {
                    Member = "Estado",
                    Width = "130px",
                },
                new GridColumnSettings
                {
                    Member = "Nombre",
                    Width = "130px"
                },
                new GridColumnSettings
                {
                    Member = "Descripcion",
                    Width = "300px"
                },
                new GridCommandColumnSettings
                {
                    Commands =
                    {
                        new GridEditActionCommand(),
                        new GridDeleteActionCommand()
                    },
                    Width = "180px",
                    Title = "Acciones"
                }
            };
            ViewData["Columns"] = columns;
            ViewData["aplicaciones"] = serviciosGrupos.getAplicaciones();
            ViewData["estados"] = serviciosGrupos.getEstados();
            return View(serviciosGrupos.getGrupos());
        }

Thank you

[Atanas Korchev]

Hi sebrojas,

Unfortunately the stacktrace does not indicate what may have caused this problem. Could you please provide a sample project? Since the forum does not allow attachments you can use some public hosting web site such as dropbox.com or skydrive.live.com.

Regards,
Atanas Korchev
the Telerik team

[Harvey]

I had a similar problem when clicking the "add new record" button for insert.
I found that the data model object the grid was displaying needed a constructor defined which initialised all of the public get/set properties. This solved my issue.