Chart - Local Data Error

[Allan]

Hello,

I have a donut chart that uses local data and I'm getting an error on my series of:

Cannot convert lambda expression to type 'System.Collections.IEnumerable' because it is not a delegate type

The chart is being used in a partial view.  Here is my source code.

Partial View

@model IEnumerable<MyProject.ViewModels.UtilisationViewModel>
<div class="row">
    <div class="col-md-6">
        <div class="demo-section k-content wide">
        @(Html.Kendo().Chart(Model)
            .Name("chart")
            .Title("Utilisation")
            .Legend(legend => legend
            .Position(ChartLegendPosition.Bottom))
        .Series(series =>
        {
            series.Donut(
                model => model.ahts
            );
          })
        )
        </div>
    </div>
</div>

The ViewModel

using System;

using System.Collections.Generic;

using System.ComponentModel.DataAnnotations;

using System.Linq;

using System.Data.Entity;

using System.Web;

using Spoton_Areas_Test.Models;

 

namespace MyProject.ViewModels

{

    public class UtilisationViewModel

    {

        public int idx_index { get; set; }

        public Nullable<System.DateTime> applies_date { get; set; }

        public Nullable<decimal> ahts { get; set; }

        public Nullable<decimal> psv { get; set; }

        public Nullable<int> region_idx { get; set; }

        public string region_name { get; set; }

    }

}

Can anyone point me in the direction of what is going wrong? 

 

Many thanks

[Helen]

Hello Allan,

Try with the following declaration:

@model IEnumerable<MyProject.ViewModels.UtilisationViewModel>
<div class="row">
    <div class="col-md-6">
        <div class="demo-section k-content wide">
            @(Html.Kendo().Chart(Model)
                    .Name("chart")
                    .Title("Utilisation")
                    .Legend(legend => legend
                    .Position(ChartLegendPosition.Bottom))
                             .Series(series =>
                             {
                                 series.Donut(
                                     model => model.ahts,
                                     null

                                 );
                             })

            )
        </div>
    </div>
</div>

Regards,
Helen
Telerik

[Allan]

Thanks for this Helen, this cured the error message althouh the chart doesn't show at all.

[Helen]

Hi Allan,

How exactly do you fill chart with data in the controller? You may open a support ticket and send us your complete project to examine it locally.

Regards,
Helen
Telerik

[Mark]

Any resolution here? Having same issue.

[T. Tsonev]

Hello,

The donut series expect the model to define a value and category for each data point. See the code from the demo.

We can reduce it to:
    Html.Kendo().Chart(Model)
        .Name("chart")
        .Series(series =>
        {
            series.Donut(
                model => model.Percentage,
                model => model.Source
            );
        })
        ...

I hope this helps.

Regards,
T. Tsonev
Telerik