Migrate from Xamarin.Forms SfChart to .NET MAUI SfPolarChart

18 Mar 202413 minutes to read

The Polar Chart was created from the scratch using the upgraded APIs and performance of the .NET MAUI graphics library and framework layouts. However, a minor code change is required. In addition, SfChart has been divided into five chart controls in .NET MAUI for a better user experience and understanding.

Xamarin .NET MAUI
SfChart
SfCartesianChart
SfCircularChart
SfFunnelChart
SfPyramidChart
SfPolarChart

To make the migration easier, the majority of the APIs from the Xamarin SfChart were kept in the .NET MAUI SfPolarChart. Currently, most of the features have been added in the SfPolarChart, but only a few are pending in the .NET MAUI along with some limitations. Please refer to the following details and the API migration information available below.

API migration

To initialize the control, import the Chart namespace and Initialize SfPolarChart as shown in the following code sample.

Xamarin 
<ContentPage
    . . .
    xmlns:chart="clr-namespace:Syncfusion.SfChart.XForms;assembly=Syncfusion.SfChart.XForms">

        <chart:SfChart/>

</ContentPage>
using Syncfusion.SfChart.XForms;
...
SfChart chart = new SfChart(); 
this.Content = chart;
.NET MAUI 
<ContentPage
    . . .    
    xmlns:chart="clr-namespace:Syncfusion.Maui.Charts;assembly=Syncfusion.Maui.Charts">
   
        <chart:SfPolarChart/>  
</ContentPage>
using Syncfusion.Maui.Charts;
. . .
SfPolarChart chart = new SfPolarChart(); 
this.Content = chart;

The following table illustrates the API migration for the chart.

Xamarin .NET MAUI
Title Title
Legend Legend
Series Series
PrimaryAxis PrimaryAxis
SecondaryAxis SecondaryAxis
ColorModel, CustomBrushes PaletteBrushes
ChartBehaviors TooltipBehavior

Axis

Xamarin .NET MAUI
VisibleMinimum VisibleMinimum
VisibleMaximum VisibleMaximum
VisibleLabels VisibleLabels
LabelClicked Upcoming
TickPosition Upcoming
MaximumLabels Upcoming
LabelsIntersectAction Upcoming

The following code example explains how to migrate the axis of Xamarin SfChart to .NET MAUI SfPolarChart.

Xamarin 
<chart:SfChart>  
    <chart:SfChart.PrimaryAxis>
	     <chart:CategoryAxis/>
    </chart:SfChart.PrimaryAxis>

    <chart:SfChart.SecondaryAxis>
	     <chart:NumericalAxis/>
    </chart:SfChart.SecondaryAxis>
</chart:SfChart>
SfChart chart = new SfChart();
CategoryAxis primaryAxis = new CategoryAxis();
chart.PrimaryAxis = primaryAxis;
NumericalAxis secondaryAxis  =  new NumericalAxis();
chart.SecondaryAxis = secondaryAxis;
this.Content = chart;
.NET MAUI 
<chart:SfPolarChart>                            
    <chart:SfPolarChart.PrimaryAxis>
        <chart:CategoryAxis/>
    </chart:SfPolarChart.PrimaryAxis>
    
    <chart:SfPolarChart.SecondaryAxis>
        <chart:NumericalAxis/>
    </chart:SfPolarChart.SecondaryAxis>                       
</chart:SfPolarChart>
SfPolarChart chart = new SfPolarChart();
CategoryAxis primaryAxis = new CategoryAxis();
chart.PrimaryAxis = primaryAxis;
NumericalAxis secondaryAxis  =  new NumericalAxis();
chart.SecondaryAxis = secondaryAxis;
this.Content = chart;

Series

Xamarin .NET MAUI
Color Fill
DataMarker ShowDataLabels, DataLabelSettings
IsClosed IsClosed

The following code example explains how to migrate the series of Xamarin SfChart to .NET MAUI SfPolarChart.

Xamarin 
<chart:SfChart>
. . .
    <chart:PolarAreaSeries ItemsSource="{Binding PlantDetails}" XBindingPath="Direction" YBindingPath="Tree">
	</chart:PolarAreaSeries>
</chart:SfChart>
SfChart chart = new SfChart();
. . .
PolarAreaSeries series = new PolarAreaSeries();
series.SetBinding(ChartSeries.ItemsSourceProperty, "PlantDetails");
series.XBindingPath = "Direction";
series.YBindingPath = "Tree";
chart.Series.Add(series);
this.Content = chart;
.NET MAUI 
<chart:SfPolarChart>
    <chart:PolarAreaSeries ItemsSource="{Binding PlantDetails}" XBindingPath="Direction" YBindingPath="Tree">
    </chart:PolarAreaSeries>
</chart:SfPolarChart>
SfPolarChart chart = new SfPolarChart();
. . .
PolarAreaSeries series = new PolarAreaSeries();
series.ItemsSource = (new ViewModel()).PlantDetails;
series.XBindingPath = "Direction";
series.YBindingPath = "Tree";
series.Label = "Tree";
series.ShowDataLabels = true;
chart.Series.Add(series);
this.Content = chart;

Legend

Xamarin .NET MAUI
ToggleSeriesVisibility ToggleSeriesVisibility
DockPosition Placement
IsVisible IsVisible
ItemTemplate ItemTemplate
Title Upcoming
OverflowMode Upcoming
MaxWidth Upcoming
Orientation Upcoming
IsIconVisible Upcoming
ItemMargin Upcoming
IconWidth Upcoming
IconTree Upcoming
OffsetX Upcoming
OffsetY Upcoming

The following code example shows how to enable legend in chart.

Xamarin 
<chart:SfChart>
    <chart:SfChart.Legend>
        <chart:ChartLegend/>
	</chart:SfChart.Legend>
</chart:SfChart>
SfChart chart = new SfChart();
. . .
chart.Legend = new ChartLegend ();
.NET MAUI 
<chart:SfPolarChart>
    <chart:SfPolarChart.Legend>
        <chart:ChartLegend/>
	</chart:SfPolarChart.Legend>
</chart:SfPolarChart>
SfPolarChart chart = new SfPolarChart();
. . .
chart.Legend = new ChartLegend ();

Data Label

To customize the data label appearance, create an instance of the ChartDataMarker class and add it to the DataMarker of Series. For SfPolarChart, you can set the PolarDataLabelSettings instance to the DataLabelSettings property, as shown in the below code sample.

Xamarin 
<chart:SfChart>  
     . . .
    <chart:PolarAreaSeries ItemsSource="{Binding PlantDetails}" XBindingPath="Direction" YBindingPath="Tree">
	    <chart:PolarAreaSeries.DataMarker>
	        <chart:ChartDataMarker ShowLabel="True">
		        <chart:ChartDataMarker.LabelStyle>
			        <chart:DataMarkerLabelStyle TextColor="Blue" BorderColor="Red" BorderThickness="2" 
                                            BackgroundColor="Aqua" Angle="315" Margin="5" 
                                            FontSize="18" FontAttributes="Italic"/>
		        </chart:ChartDataMarker.LabelStyle>
	        </chart:ChartDataMarker>
	    </chart:PolarAreaSeries.DataMarker>
    </chart:PolarAreaSeries>
</chart:SfChart>
PolarAreaSeries series = new PolarAreaSeries();
. . .
series.DataMarker = new ChartDataMarker();
series.DataMarker.ShowLabel = true;
var style = new DataMarkerLabelStyle();
style.TextColor = Color.Blue;
style.BorderColor = Color.Red;
style.BorderThickness = 2;
style.BackgroundColor = Color.Aqua;
style.Angle = 315;
style.Margin = 5;
style.FontSize = 18;
series.DataMarker.LabelStyle = style;
chart.Series.Add(series);
.NET MAUI 
<chart:SfPolarChart>
    . . .
    <chart:PolarAreaSeries ItemsSource="{Binding PlantDetails}" XBindingPath="Direction" YBindingPath="Tree" 
                    ShowDataLabels="True">
        <chart:PolarAreaSeries.DataLabelSettings>
            <chart:PolarDataLabelSettings>
                <chart:PolarDataLabelSettings.LabelStyle>
                    <chart:ChartDataLabelStyle TextColor="Blue" Stroke="Red" StrokeWidth="2" Background="Aqua" 
                            Angle="315" Margin="5" FontSize="18" FontAttributes="Italic"/>
                </chart:PolarDataLabelSettings.LabelStyle>
            </chart:PolarDataLabelSettings>
        </chart:PolarAreaSeries.DataLabelSettings>  
    </chart:PolarAreaSeries>
</chart:SfPolarChart>
PolarAreaSeries series = new PolarAreaSeries();
. . .
series.ShowDataLabels = true;
series.PolarDataLabelSettings = new PolarDataLabelSettings();
var style = new ChartDataLabelStyle();
style.TextColor = Color.Blue;
style.Stroke = Color.Red;
style.StrokeWidth = 2;
style.Background = Color.Aqua;
style.Angle = 315;
style.Margin = 5;
style.FontSize = 18;
series.PolarDataLabelSettings.LabelStyle = style;
chart.Series.Add(series);

Tooltip

To customize the tooltip appearance, create an instance of the ChartTooltipBehavior class and add it to the ChartBehaviors collection of SfChart. For SfPolarChart, you can directly set the ChartTooltipBehavior instance to the TooltipBehavior property, as shown in the below code sample.

Xamarin 
<chart:SfChart>
. . . 
    <chart:SfChart.ChartBehaviors>
        <chart:ChartTooltipBehavior BackgroundColor="Blue" TextColor="White" Margin="5" 
                            FontSize="15"/>
    </chart:SfChart.ChartBehaviors>
    
    <chart:PolarAreaSeries ItemsSource="{Binding Data}" XBindingPath="Demand" YBindingPath="Year2010"
                            EnableTooltip="True"/>
</chart:SfChart>
PolarAreaSeries series = new PolarAreaSeries();
. . .
series.EnableTooltip = true;
chart.Series.Add(series);
ChartTooltipBehavior tool = new ChartTooltipBehavior();
tool.BackgroundColor = Color.Blue;
tool.TextColor = Color.White;
tool.Margin = new Thickness(5, 5, 5, 5);
chart.ChartBehaviors.Add(tool);
.NET MAUI 
<chart:SfPolarChart>
. . .
   <chart:SfPolarChart.TooltipBehavior>
        <chart:ChartTooltipBehavior Background="Blue" TextColor="White" Margin="5" 
                    FontSize="15"/>
   </chart:SfPolarChart.TooltipBehavior>

   <chart:PolarAreaSeries ItemsSource="{Binding Data}" XBindingPath="Demand" YBindingPath="Year2010"
                    EnableTooltip="True"/>
</chart:SfPolarChart>
PolarAreaSeries series = new PolarAreaSeries();
. . .
series.EnableTooltip = true;
chart.Series.Add(series);

ChartTooltipBehavior tooltip = new ChartTooltipBehavior();
tooltip.BackgroundColor = Color.Blue;
tooltip.TextColor = Color.White;
tooltip.Margin = new Thickness(5, 5, 5, 5);
chart.TooltipBehavior = tooltip;

Upcoming features in .NET MAUI

Chart

  • Suspend and resume notification support.

Series

  • Listen to property change support for series.
  • Notify event or method when series are rendering.
  • Suspend and resume notification.

Axis

  • DateTime category axis support.
  • Align the axis labels and tick inside the series clip rect.
  • Range style customization.
  • Event or method to notify the axis label click.

Legend

  • Title support for legend.
  • Support to enable or disable the legend icon visibility.
  • Legend items wrap and floating support.
  • Maximum width support for Legend.
  • Event or method to notify the legend click and the creation of a legend item.

Known issue

  • #FB49487 - Gradient Support for Line-Based Series in .NET MAUI Chart.

Unsupported features from Xamarin.Forms

  • Data label created event support was not provided in series. Instead, you can use the DrawDataLabel override method in the ChartSeries class.
  • In.NET MAUI, the ChartDataPoint model class was no longer available. Instead, create your own model.

Support and feedback

If you are unable to find the migration information you require in the self-help resources listed above, please contact us by creating a support ticket. Do not see what you need? Please request it in our feedback portal.