添加项目文件。

Live-Charts-master/Examples/WinForms/PieChart/DoughnutExample.cs

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+using System.Windows.Forms;
+using LiveCharts;
+using LiveCharts.Wpf;
+
+namespace Winforms.PieChart
+{
+    public partial class DoughnutExample : Form
+    {
+        public DoughnutExample()
+        {
+            InitializeComponent();
+
+            pieChart1.InnerRadius = 100;
+            pieChart1.LegendLocation = LegendLocation.Right;
+
+            pieChart1.Series = new SeriesCollection
+            {
+                new PieSeries
+                {
+                    Title = "Chrome",
+                    Values = new ChartValues<double> {8},
+                    PushOut = 15,
+                    DataLabels = true
+                },
+                new PieSeries
+                {
+                    Title = "Mozilla",
+                    Values = new ChartValues<double> {6},
+                    DataLabels = true
+                },
+                new PieSeries
+                {
+                    Title = "Opera",
+                    Values = new ChartValues<double> {10},
+                    DataLabels = true
+                },
+                new PieSeries
+                {
+                    Title = "Explorer",
+                    Values = new ChartValues<double> {4},
+                    DataLabels = true
+                }
+            };
+        }
+    }
+}