添加项目文件。

Live-Charts-master/Examples/Wpf/CartesianChart/CustomTooltipAndLegend/CustomersTooltip.xaml.cs

@@ -0,0 +1,41 @@
+using System.ComponentModel;
+using LiveCharts;
+using LiveCharts.Wpf;
+
+namespace Wpf.CartesianChart.CustomTooltipAndLegend
+{
+    public partial class CustomersTooltip : IChartTooltip
+    {
+        private TooltipData _data;
+
+        public CustomersTooltip()
+        {
+            InitializeComponent();
+
+            //LiveCharts will inject the tooltip data in the Data property
+            //your job is only to display this data as required
+                       
+            DataContext = this;
+        }
+
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        public TooltipData Data
+        {
+            get { return _data; }
+            set
+            {
+                _data = value;
+                OnPropertyChanged("Data");
+            }
+        }
+
+        public TooltipSelectionMode? SelectionMode { get; set; }
+
+        protected virtual void OnPropertyChanged(string propertyName = null)
+        {
+            if (PropertyChanged != null)
+                PropertyChanged.Invoke(this, new PropertyChangedEventArgs(propertyName));
+        }
+    }
+}