添加项目文件。

Live-Charts-master/Examples/UWP/CartesianChart/Energy Predictions/OpacityConverter.cs

@@ -0,0 +1,21 @@
+using System;
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Data;
+
+namespace UWP.CartesianChart.Energy_Predictions
+{
+    public class OpacityConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, string language)
+        {
+            return (Visibility)value == Visibility.Visible
+                ? 1d
+                : .2d;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, string language)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}