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error when adding events

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Christian Sandöy
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Christian Sandöy asked on 31 Jul 2017, 07:34 AM

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())

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Dimitar
Telerik team
answered on 02 Aug 2017, 01:34 PM
Hello Christian,

I am attaching an ASP.NET Core solution where a similar scenario to the one described is demonstrated (Kendo UI MultiSelect with server binding).

In order to fix the error, you can cast the ViewBag variable to an explicit type:
.BindTo((YourDataType)ViewBag.Collection)

Another alternative would be to simply move the .Events(...) definition before BindTo(...). Both of the suggested approaches should be able to solve the issue.

Regards,
Dimitar
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MultiSelect
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Christian Sandöy
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Answers by
Dimitar
Telerik team
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