[C#/WINUI3/.NET8] ListView 클래스 : SelectionChanged 이벤트를 사용해 선택 변경시 처리하기

■ ListView 클래스의 SelectionChanged 이벤트를 사용해 선택 변경시 처리하는 방법을 보여준다.

※ 비주얼 스튜디오에서 TestProject(Unpackaged) 모드로 빌드한다.
※ TestProject.csproj 프로젝트 파일에서 WindowsPackageType 태그를 None으로 추가했다.

▶ MainPage.xaml


<?xml version="1.0" encoding="utf-8"?>
<Page x:Class="TestProject.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"
    FontFamily="나눔고딕코딩"
    FontSize="16">
    <StackPanel
        HorizontalAlignment="Center"
        VerticalAlignment="Center"
        Spacing="10">
        <ListView Name="listView"
            SelectionMode="Multiple">
            <x:String>Apricot</x:String>
            <x:String>Banana</x:String>
            <x:String>Cherry</x:String>
            <x:String>Orange</x:String>
            <x:String>Strawberry</x:String>
        </ListView>
        <TextBlock Name="selectedItemTextBlock"     />
        <TextBlock Name="selectedIndexTextBlock"    />
        <TextBlock Name="selectedItemCountTextBlock"/>
        <TextBlock Name="addedItemsTextBlock"       />
        <TextBlock Name="removedItemsTextBlock"     />
    </StackPanel>
</Page>

<?xml version="1.0" encoding="utf-8"?>

<Page x:Class="TestProject.MainPage"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"

FontFamily="나눔고딕코딩"

FontSize="16">

<StackPanel

HorizontalAlignment="Center"

VerticalAlignment="Center"

Spacing="10">

<ListView Name="listView"

SelectionMode="Multiple">

<x:String>Apricot</x:String>

<x:String>Banana</x:String>

<x:String>Cherry</x:String>

<x:String>Orange</x:String>

<x:String>Strawberry</x:String>

</ListView>

</StackPanel>

</Page>

▶ MainPage.xaml.cs


using Microsoft.UI.Xaml.Controls;

namespace TestProject;

/// <summary>
/// 메인 페이지
/// </summary>
public sealed partial class MainPage : Page
{
    //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor
    ////////////////////////////////////////////////////////////////////////////////////////// Public

    #region 생성자 - MainPage()

    /// <summary>
    /// 생성자
    /// </summary>
    public MainPage()
    {
        InitializeComponent();

        this.listView.SelectionChanged += listView_SelectionChanged;
    }

    #endregion

    //////////////////////////////////////////////////////////////////////////////////////////////////// Method
    ////////////////////////////////////////////////////////////////////////////////////////// Private

    #region 리스트 뷰 선택 변경시 처리하기 - listView_SelectionChanged(sender, e)

    /// <summary>
    /// 리스트 뷰 선택 변경시 처리하기
    /// </summary>
    /// <param name="sender">이벤트 발생자</param>
    /// <param name="e">이벤트 인자</param>
    private void listView_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        if(this.listView.SelectedItem != null)
        {
            this.selectedItemTextBlock.Text = "Selected item : " + this.listView.SelectedItem.ToString();
        }
        else
        {
            this.selectedItemTextBlock.Text = "Selected item : null";
        }

        this.selectedIndexTextBlock.Text     = "Selected index : " + this.listView.SelectedIndex.ToString();
        this.selectedItemCountTextBlock.Text = "Items selected : " + this.listView.SelectedItems.Count.ToString();
        this.addedItemsTextBlock.Text        = "Added   : " + e.AddedItems.Count.ToString();
        this.removedItemsTextBlock.Text      = "Removed : " + e.RemovedItems.Count.ToString();
    }

    #endregion
}

using Microsoft.UI.Xaml.Controls;

namespace TestProject;

/// <summary>

/// 메인 페이지

/// </summary>

public sealed partial class MainPage : Page

{

//////////////////////////////////////////////////////////////////////////////////////////////////// Constructor

////////////////////////////////////////////////////////////////////////////////////////// Public

#region 생성자 - MainPage()

/// <summary>

/// 생성자

/// </summary>

public MainPage()

{

InitializeComponent();

this.listView.SelectionChanged += listView_SelectionChanged;

}

#endregion

//////////////////////////////////////////////////////////////////////////////////////////////////// Method

////////////////////////////////////////////////////////////////////////////////////////// Private

#region 리스트 뷰 선택 변경시 처리하기 - listView_SelectionChanged(sender, e)

/// <summary>

/// 리스트 뷰 선택 변경시 처리하기

/// </summary>

/// <param name="sender">이벤트 발생자</param>

/// <param name="e">이벤트 인자</param>

private void listView_SelectionChanged(object sender, SelectionChangedEventArgs e)

{

if(this.listView.SelectedItem != null)

{

this.selectedItemTextBlock.Text = "Selected item : " + this.listView.SelectedItem.ToString();

}

else

{

this.selectedItemTextBlock.Text = "Selected item : null";

}

this.selectedIndexTextBlock.Text = "Selected index : " + this.listView.SelectedIndex.ToString();

this.selectedItemCountTextBlock.Text = "Items selected : " + this.listView.SelectedItems.Count.ToString();

this.addedItemsTextBlock.Text = "Added : " + e.AddedItems.Count.ToString();

this.removedItemsTextBlock.Text = "Removed : " + e.RemovedItems.Count.ToString();

}

#endregion

}

TestProject.zip