C# UWP VS2017 ComboBox事件错误:无法激活Windows应用商店应用

public MainPage()
{
    this.InitializeComponent();
    ComboBox1.SelectionChanged += ComboBox1_SelectionChanged;
}

private void ComboBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    // 处理选择变化的逻辑
}

<!-- MainPage.xaml -->
<Page
    x:Class="YourNamespace.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:YourNamespace"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">

    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
        <ComboBox x:Name="ComboBox1" SelectionChanged="ComboBox1_SelectionChanged">
            <ComboBoxItem Content="Option 1"/>
            <ComboBoxItem Content="Option 2"/>
            <ComboBoxItem Content="Option 3"/>
        </ComboBox>
    </Grid>
</Page>

// MainPage.xaml.cs
using Windows.UI.Xaml.Controls;

namespace YourNamespace
{
    public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();
        }

        private void ComboBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (ComboBox1.SelectedItem != null)
            {
                var selectedOption = (ComboBoxItem)ComboBox1.SelectedItem;
                // 处理选择变化的逻辑
                System.Diagnostics.Debug.WriteLine(selectedOption.Content.ToString());
            }
        }
    }
}