ASP.NET MVC 3.0 Chart Helper display Legend

Question

Is there any way to display legend on chart using chart helper?

It is not displaying it by default, there is no property i can say to display and if i specify legend in xml :

<Legends>
    <Legend _Template_=""All"" BackColor=""Black"" Docking=""Bottom"" Font=""Trebuchet MS, 8.25pt, style=Bold"" LegendStyle=""Row"" >
    </Legend>
  </Legends>  

It is also not working.

There is method in chart helper public Chart AddLegend(string title = null, string name = null); but when i am calling it i can't see not the legend on my chart, chart not displaying as well.

Chart chart = new System.Web.Helpers.Chart(width: 120, height: 300, theme: chartStyle: ChartTheme.Green.ToString()) 
                .AddLegend("title", "name") // not existed legends, that's why error.
                .AddSeries(
                    chartType: "Column"
                    legend: "Rainfall"
                    xValue: new[] { "jan", "feb", "mar", "apr", "may" },
                    yValues: new[] { "20", "20", "40", "10", "10" });

.Getting error: Series 'Series1' uses non-existing legend name 'Rainfall'. Set Legend property value to Default

If i change legend: "Rainfall" to legend: "Default" getting same error.

How could i make this legend name existed? For example in case of using System.Web.UI.DataVisualization.Charting directly it will be looking like that:

        chart.Legends.Add("Legend1");

        // show legend based on check box value
        chart.Legends["Legend1"].Enabled = true;

But how to achieve the same thing with helper?

Answer 1

You need to give each Series a name, then call the AddLegend() with no parameters to add the Legend.

    var chart = new Chart(width: 600, height: 250)
        .AddSeries(
            chartType: "column",
            xValue: new [] { 2010, 2011, 2012 },
            yValues: new[] { 100, 125, 150 },
            name: "Forecasts")
        .AddSeries(
            chartType: "column",
            xValue: new[] { 2010, 2011, 2012 },
            yValues: new[] { 200, 225, 250 },
            name: "Actuals")
        .AddLegend();