When I try to  add event to a multiselect I get this error

cannot use a lambda expression as an argument to a dynamically dispatched operation without first casting it to a delegate or expression tree type

 I have tried these to method to add event

@(Html.Kendo().MultiSelectFor(m => m.OmviserNavne)
                                    .Placeholder("Vælg omviser...")
                                    .BindTo(ViewBag.Omviser)
                                    .Events(e =>
                                    {
                                        e.Change("onOmviserChange")
                                    })
                                    .Deferred())

@(Html.Kendo().MultiSelectFor(m => m.OmviserNavne)
                                    .Placeholder("Vælg omviser...")
                                    .BindTo(ViewBag.Omviser)
                                    .Events(events => events.Change("onOmviserChange"))
                                    .Deferred())

Hello, 

I'm trying to get a grid with a select option just like this example http://demos.telerik.com/aspnet-core/grid/checkbox-selection

My grid loads with all the proper data however the columns.Select().Width(50);  does not load any check boxes like the example does. 

Here is the code that I am using.  I will also attach a screen shot of what this produces. 

@(
    Html.Kendo()
        .Grid<PlanReviewItemViewModel>()
        .Name("linkFolderAttachmentPlanReviewItems")
        .Columns(col =>
        {
            col.Select().Width(50);
            col.Bound(p => p.MunicipalNumber);
        })
        .Sortable()
        .DataSource(ds =>
        {
            ds.Ajax()
                .Read(read =>
                {
                    read.Action("GetPlanReviewItems", "PlanReviewItemsApi", new { caid = "PLDG5" });
                });
        })
)

I have a grid with an editor template like so:

In my grid I have the column defined like so:

The VatRate property is defined like so:

What I would like is for select the appropriate VAT rate and for the DDL to pass the decimal value back to the cell (something like this http://www.screencast.com/t/V41xQlYWq )

But I can't figure out how to do it, any help would be appreciated?

Hi!
I obtain this error when I try to Grouping by a default field in my Grid.

"ArgumentException: Invalid property or field - 'description' for type: AggregateFunctionsGroup
Kendo.Mvc.Infrastructure.Implementation.Expressions.MemberAccessTokenExtensions.CreateMemberAccessExpression(IMemberAccessToken token, Expression instance)"

I've tried many combinations of options and none works.

        <div>
            @(Html.Kendo().Grid<Gap.Web.ViewModels.QuestionViewModel>(Model)
                                                .Name("Preguntas")
                                                .Columns(columns =>
                                                {
                                                    columns.Bound(p => p.Text).Width(200);
                                                    columns.Bound(p => p.description).Width(150);
                                                    columns.ForeignKey(p => p.DataTypeID, (System.Collections.IEnumerable)ViewData["DataTypeNameList"], "DataTypeID", "DataTypeName").Width(85);
                                                    columns.Bound(p => p.AnswerOptions).ClientTemplate("#=AnswerOptionTemplate(AnswerOptions)#").EditorTemplateName("AnswerOptionsEditor").Width(170);
                                                    columns.Bound(p => p.required).ClientTemplate(IsRequiredTemplate).HtmlAttributes(new { style = "text-align: center" }).Width(70);
                                                    columns.Command(command =>
                                                    {
                                                        command.Edit().Text("Editar")
                                                                      .UpdateText("Salvar")
                                                                      .CancelText("Cancelar");
                                                        command.Destroy().Text("Borrar");
                                                    }).Width(120);
                                                })
                                                .ToolBar(toolBar => toolBar.Create().Text("Añadir"))
                                                .Selectable()
                                                .Editable(editable => editable.Mode(GridEditMode.InLine))
                                                .Scrollable(s => s.Virtual(true).Height("100%;"))
                                                .Groupable(false)
                                                .HtmlAttributes(new { style = "height:500px;" })
                                                .DataSource(datasource => datasource
                                                    .Ajax()
                                                    .ServerOperation(false)
                                                    .PageSize(40)
                                                    .Model(model =>
                                                    {
                                                        model.Id(p => p.Id);
                                                        model.Field(p => p.description).DefaultValue("");
                                                        model.Field(p => p.Text);
                                                        model.Field(p => p.DataTypeID).DefaultValue(0);
                                                        model.Field(p => p.AnswerOptions).DefaultValue(new List<Gap.Web.ViewModels.AnswerOptionViewModel>()); ;
                                                        model.Field(p => p.required).DefaultValue(true);
                                                    })                                                    

[THIS DOES NOT WORK] =>     .Group(g => g.Add("description", typeof(String)))
                                                    .Create(update => update.Action("EditingInline_Create", "Admin"))
                                                    .Read(read => read.Action("EditingInline_Read", "Admin"))
                                                    .Update(update => update.Action("EditingInline_Update", "Admin"))
                                                    .Destroy(update => update.Action("EditingInline_Destroy", "Admin"))
                                                    )
                                                    .Events(events => events
                                                        .Save("onSave")
                                                        .Cancel("onCancel")
                                                        .Edit("selectRowOnEdit")
                                                    )
                                                   .Deferred()
            )
        </div>

Any advice please?!

Thanks in advantage!

R.Perucha

I am using the Grid control on several different pages within my ASP.NET Core MVC app. All of a sudden on several of them I am running in to some weird issues. I am using Telerik.UI.for.AspNet.Core.Trial 2017.2.621

On page load everything works fine. If I do a POST to submit a search, which reloads the same exact page, I am getting weird server side exceptions. On some pages everything works just fine and the issue doesn't happen. I've compared the ones that work and don't work and can't find any real difference. I've also seen some weird exceptions about parsing strings to numbers.

      "exceptions": [
        {
          "id": 26884016,
          "typeName": "System.NullReferenceException",
          "message": "Object reference not set to an instance of an object.",
          "hasFullStack": true,
          "stack": "   at Kendo.Mvc.UI.DataSourceRequestModelBinder.TryGetValue[T](ModelMetadata modelMetadata, IValueProvider valueProvider, String modelName, String key, Action`1 action)\r\n   at Kendo.Mvc.UI.DataSourceRequestModelBinder.CreateDataSourceRequest(ModelMetadata modelMetadata, IValueProvider valueProvider, String modelName)\r\n   at Kendo.Mvc.UI.Grid`1.ProcessDataSource()\r\n   at Kendo.Mvc.UI.Grid`1.ProcessSettings()\r\n   at Kendo.Mvc.UI.WidgetBase.RenderHtml(TextWriter writer)\r\n   at Kendo.Mvc.UI.WidgetBase.ToHtmlString()\r\n   at Kendo.Mvc.UI.Fluent.WidgetBuilderBase`2.WriteTo(TextWriter writer, HtmlEncoder encoder)\r\n   at Microsoft.AspNetCore.Mvc.ViewFeatures.Internal.ViewBuffer.<WriteToAsync>d__22.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at Microsoft.AspNetCore.Mvc.Razor.RazorView.<RenderLayoutAsync>d__17.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at Microsoft.AspNetCore.Mvc.Razor.RazorView.<RenderAsync>d__13.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at Microsoft.AspNetCore.Mvc.ViewFeatures.ViewExecutor.<ExecuteAsync>d__18.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at Microsoft.AspNetCore.Mvc.ViewResult.<ExecuteResultAsync>d__26.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeResultAsync>d__30.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeNextResultFilterAsync>d__28.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow(ResultExecutedContext context)\r\n   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)\r\n   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeNextResourceFilter>d__22.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow(ResourceExecutedContext context)\r\n   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)\r\n   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeAsync>d__20.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at Microsoft.AspNetCore.Builder.RouterMiddleware.<Invoke>d__4.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware`1.<Invoke>d__18.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware`1.<Invoke>d__18.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware`1.<Invoke>d__18.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware`1.<Invoke>d__18.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware`1.<Invoke>d__18.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware`1.<Invoke>d__18.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware`1.<Invoke>d__18.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware`1.<Invoke>d__18.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware`1.<Invoke>d__18.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware`1.<Invoke>d__18.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.<Invoke>d__7.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.<Invoke>d__7.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at Microsoft.AspNetCore.Session.SessionMiddleware.<Invoke>d__9.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at Microsoft.AspNetCore.Session.SessionMiddleware.<Invoke>d__9.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at StackifyMiddleware.RequestTracerMiddleware.<Invoke>d__4.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at Microsoft.AspNetCore.Server.IISIntegration.IISMiddleware.<Invoke>d__8.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at Microsoft.AspNetCore.Hosting.Internal.RequestServicesContainerMiddleware.<Invoke>d__3.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at Microsoft.AspNetCore.Server.Kestrel.Internal.Http.Frame`1.<RequestProcessingAsync>d__2.MoveNext()"
        }
      ]

My razor code is simple like this:

@(Html.Kendo().Grid< GSCKeyword.GridRecord>(Model.Records)
      .Name("Grid")
      .Columns(columns =>
      {
          columns.Bound(p => p.Query).Title("Query");
          columns.Bound(p => p.Clicks).Title("Clicks").Format("{0:N0}");
          columns.Bound(p => p.Impressions).Title("Impressions").Format("{0:N0}");
          columns.Bound(p => p.CTR).Title("CTR").Format("{0:#0.#}%").Width(70);
          columns.Bound(p => p.Position).Title("Position").Format("{0:##0.#}").Width(70);
          columns.Bound(p => p.Page).Title("Top Page");
      })
      .Pageable()
      .Sortable()

      .DataSource(dataSource => dataSource
          .Ajax()
          .PageSize(500)
          .ServerOperation(false)
      )
)

Hello,

Could anybody tell me which version of Telerik.Web.UI.dll FIRST started to use new setting "Telerik.AsyncUpload.ConfigurationEncryptionKey" in the web.config file for extra security for file upload?

Which version was the first to introduce this setting?

Thanks

I am using the following simple TagHelper:

   <kendo-datepicker name="DatePicker"
                                  for="Date"
                                  style='width: 280px;'>
    </kendo-datepicker> 

It works correctly but compiles with the following warning:

Warning Element 'kendo-datepicker' does not allow content and cannot have separate end tag.

I cannot get rid of the warning, what does it mean and how do I get rid of it?

Hi!

We are developing a Grid, and we require having an Editable ListBox in a Cell of a GRID.
I have search for this solution and try coding during a week without success.
My project is ASP.NET Core and MVC tech. I have tried with EditorTemplates and ClientDetailTemplateId without lucky.
Please, is this possible? Has the ListBox a SAVING action? and how can achieve this or similar?
The final requirement is having a Editable List of string items in the databound of the ViewModel.

Thanks in advance!

I have the following data structures in my app:

public class MetricValue
{
    public DateTime TimeStamp { get; set; }
    public double Average
}

public class CustomMetrics
{
    public string ResourceName { get; set; }
    public List<MetricValue> Metrics { get; set; }
}

This is the Action that returns the data for the chart in the razor view:
public async Task<IActionResult> GetAllDatabasesDTUPercentages()
{
    List<CustomMetrics> data = ...

    return Json(data);
}

I have been reading through the demos and documentation and samples on Github but I have no idea how to configure the chart in the razor view. Most examples have the data come through the page Model or an object with known properties as series.

The ResourceName should be the series name and I should see a series for each CustomMetrics object in the JSON data.

Any help would be appreciated.

Hi,

I'm trying download from nuget telerik core packages but after setup following this instruction: 

http://docs.telerik.com/aspnet-mvc/getting-started/nuget-install#set-up-nuget-package-source

nuget still can't establish connection to telerik.

My licence has expired few days ago but I still can use latest version in new project (i think).

Could you please help me fix the problem? Is way using telerik controls without nuget in existing project.

Thanks

Leszek