How to create kendo pie chart with model in MVC

Question

I am trying to create a Pie chart through model and controller in MVC using Kendo UI which will show the total for two types of food but I am not able to get the results due to the attached error.

Types to show in pie chart: 1)Beverages and 2)Meals

I am referring to this kind of Chart.

Kendo UI Pie chart

This link has shown multiple graphs using foreach but I am just concerned with only single chart that will differentiate the total earnings from Meals and Beverages.

My controller is:

 public ActionResult _SpainElectricityProduction()
        {
            List<PieGraphModel> objList = new List<PieGraphModel>();
            for (int i = 0; i < 2; i++)
            {
                if (i == 0)
                {
                    objList.Add(new PieGraphModel { coke = 10, pepsi = 20, Type = "Beverages", total = 30 });
                }
                else
                {
                    objList.Add(new PieGraphModel { chiniese = 50, italian = 40, Type = "Meals",  total = 90 });
                }
            }
            return Json(objList);
        }





 @(Html.Kendo().Chart<MvcRepo_Kendo.Models.PieGraphModel>()
            .Name("chart")
            .HtmlAttributes(new { @class = "small-chart" })
            .Legend(legend => legend
                .Visible(false)
            )
            .DataSource(ds =>
            {
                ds.Read(read => read.Action("_SpainElectricityProduction", "Home"));
            }
            )
            .Series(series => series
                    .Pie(model => model.total)
                    .Padding(0)
            )
            .Tooltip(tooltip => tooltip
                .Visible(true)
                .Format("{0:N0}")
                .Template("#= category # - #= kendo.format('{0:P}', percentage)#")
            )
        )

Answer 1

The Kendo method for generating a pie chart expects and array of objects, with each object representing one segment in the pie chart. Each object must contain a property for the value (the percentage that each segment will occupy in the whole) and the name of the segment. In addition, it can contain a property for the color (to override the default color) and a bool to indicate if the segment is 'exploded'.

Your PieGraphModel should look like (you can name the properties whatever you want)

public class PieGraphModel
{
    public string Name { get; set; }
    public float Value { get; set; }
    public string Color { get; set; } // optional
    public bool Explode { get; set; } // optional
}

and to create a pie chart with 2 segments, "Meals" and "Beverages", being 1/3 and 2/3 respectively, your controller method would be

List<PieGraphModel> model = new List<PieGraphModel>()
{
    new PieGraphModel(){ Name = "Meals", Value = 33.33F },
    new PieGraphModel(){ Name = "Beverages", Value = 66.67F }
};
return Json(model);

and in the view

.Series(series => series
    .Pie(m => m.Value, m => m.Name)
    .Padding(0)
)

Note that the expressions must match the names of the properties. If you also wanted to specify Color and Explode, the it would be

.Series(series => series
    .Pie(m => m.Value, m => m.Name, m => m.Color, m => m.Explode)
    .Padding(0)
)

which would output this pie chart if the data was

List<PieGraphModel> model = new List<PieGraphModel>()
{
    new PieGraphModel(){ Name = "Hydro", Value = 22.0F, Color = "#03a9f4", Explode = true },
    new PieGraphModel(){ Name = "Solar", Value = 2.0F, Color = "#ff9800"},
    new PieGraphModel(){ Name = "Nuclear", Value = 49.0F, Color = "#fad84a"},
    new PieGraphModel(){ Name = "Wind", Value = 27.0F, Color = "#4caf50"}
};