添加项目文件。

Live-Charts-master/Examples/UWP/CartesianChart/SharedTooltip/SharedTooltipExample.xaml

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+<Page
+    x:Class="UWP.CartesianChart.SharedTooltip.SharedTooltipExample"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:UWP.CartesianChart.SharedTooltip"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:lvc="using:LiveCharts.Uwp"
+    mc:Ignorable="d">
+
+    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
+        <Canvas Name="CanvasContainer">
+
+            <!-- 
+        the tooltip requires a canvas to move properly, 
+        so lets wrap our view where you need a shared tooltip 
+        with a Canvas container
+        -->
+
+            <lvc:DefaultTooltip Name="CurrentTooltip" Visibility="Collapsed" 
+                            Canvas.ZIndex="100"
+                            Canvas.Left="0" Canvas.Top="0"
+                            IsWrapped="True">
+                <!--
+            it needs to: 
+            1. Have an initial position
+            2. Be hidden on startup
+            3. to be wrapped in a Canvas, and say it with IsWrapped = true
+            -->
+            </lvc:DefaultTooltip>
+
+            <Grid Height="{Binding ActualHeight, ElementName=CanvasContainer}" 
+              Width="{Binding ActualWidth, ElementName=CanvasContainer}">
+                <Grid.ColumnDefinitions>
+                    <ColumnDefinition Width="*"></ColumnDefinition>
+                    <ColumnDefinition Width="*"></ColumnDefinition>
+                    <ColumnDefinition Width="*"></ColumnDefinition>
+                </Grid.ColumnDefinitions>
+
+                <lvc:CartesianChart Grid.Column="0" Background="White"
+                            DataTooltip="{Binding ElementName=CurrentTooltip}">
+                    <lvc:CartesianChart.Series>
+                        <lvc:LineSeries Values="{x:Bind ChartValues}" LabelPoint="{Binding LabelPoint}"></lvc:LineSeries>
+                    </lvc:CartesianChart.Series>
+                </lvc:CartesianChart>
+                <lvc:CartesianChart Grid.Column="1" Background="White"
+                            DataTooltip="{Binding ElementName=CurrentTooltip}">
+                    <lvc:CartesianChart.Series>
+                        <lvc:LineSeries Values="{x:Bind ChartValues}" LabelPoint="{Binding LabelPoint}"></lvc:LineSeries>
+                    </lvc:CartesianChart.Series>
+                </lvc:CartesianChart>
+                <lvc:CartesianChart Grid.Column="2" Background="White"
+                            DataTooltip="{Binding ElementName=CurrentTooltip}">
+                    <lvc:CartesianChart.Series>
+                        <lvc:LineSeries Values="{x:Bind ChartValues}" LabelPoint="{Binding LabelPoint}" ></lvc:LineSeries>
+                    </lvc:CartesianChart.Series>
+                </lvc:CartesianChart>
+            </Grid>
+        </Canvas>
+    </Grid>
+</Page>

Live-Charts-master/Examples/UWP/CartesianChart/SharedTooltip/SharedTooltipExample.xaml.cs

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+using LiveCharts;
+using System;
+using Windows.UI.Xaml.Controls;
+
+// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238
+
+namespace UWP.CartesianChart.SharedTooltip
+{
+    /// <summary>
+    /// An empty page that can be used on its own or navigated to within a Frame.
+    /// </summary>
+    public sealed partial class SharedTooltipExample : Page
+    {
+        public SharedTooltipExample()
+        {
+            InitializeComponent();
+
+            LabelPoint = x => "A long label so it overflows " + x;
+
+            DataContext = this;
+        }
+
+        public Func<ChartPoint, string> LabelPoint { get; set; }
+
+        public IChartValues ChartValues { get; set; } = new ChartValues<int>(new int[] { 1, 2, 3, 4, 5 });
+    }
+}