添加项目文件。

Live-Charts-master/Examples/Wpf/PieChart/DropDowns/DataProvider.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+
+namespace Wpf.PieChart.DropDowns
+{
+    public static class DataProvider
+    {
+        public static IEnumerable<double> Values
+        {
+            get
+            {
+                var r = new Random();
+
+                for (var i = 0; i < 30; i++)
+                {
+                    yield return r.NextDouble() * 100;
+                }
+            }
+        }
+    }
+}