[C#/WINUI3/.NET8] ItemsRepeater 클래스 : GetOrCreateElement/GetElementIndex 메소드를 사용해 항목/항목 인덱스 구하기

■ ItemsRepeater 클래스의 GetOrCreateElement/GetElementIndex 메소드를 사용해 항목/항목 인덱스를 구하는 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">
    <Grid Margin="10">
        <Grid.RowDefinitions>
            <RowDefinition Height="*"    />
            <RowDefinition Height="10"   />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
        <Border Grid.Row="0"
            HorizontalAlignment="Center"
            VerticalAlignment="Center"
            BorderThickness="1"
            BorderBrush="DarkGray">
            <ScrollViewer Name="scrollViewer">
                <ItemsRepeater Name="itemsRepeater">
                    <ItemsRepeater.ItemTemplate>
                        <DataTemplate x:DataType="x:String">
                            <TextBlock
                                Margin="5"
                                Text="{x:Bind}" />
                        </DataTemplate>
                    </ItemsRepeater.ItemTemplate>
                </ItemsRepeater>
            </ScrollViewer>
        </Border>
        <StackPanel Grid.Row="2"
            Orientation="Horizontal"
            Spacing="10">
            <Button Name="getItemButton"
                VerticalAlignment="Center"
                Padding="5"
                Content="항목 구하기" />
            <Button Name="getItemIndexButton"
                VerticalAlignment="Center"
                Padding="5"
                Content="항목 인덱스 구하기" />
            <TextBlock Name="messageTextBlock"
                VerticalAlignment="Center"
                Text="" />
        </StackPanel>
    </Grid>
</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">

<Grid.RowDefinitions>

</Grid.RowDefinitions>

<Border Grid.Row="0"

HorizontalAlignment="Center"

VerticalAlignment="Center"

BorderThickness="1"

BorderBrush="DarkGray">

<ItemsRepeater.ItemTemplate>

<TextBlock

Margin="5"

Text="{x:Bind}" />

</DataTemplate>

</ItemsRepeater.ItemTemplate>

</ItemsRepeater>

</ScrollViewer>

</Border>

<StackPanel Grid.Row="2"

Orientation="Horizontal"

Spacing="10">

<Button Name="getItemButton"

VerticalAlignment="Center"

Padding="5"

Content="항목 구하기" />

<Button Name="getItemIndexButton"

VerticalAlignment="Center"

Padding="5"

Content="항목 인덱스 구하기" />

<TextBlock Name="messageTextBlock"

VerticalAlignment="Center"

Text="" />

</StackPanel>

</Grid>

</Page>

▶ MainPage.xaml.cs


using System.Collections.ObjectModel;

using Microsoft.UI.Xaml;
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();

        ObservableCollection<string> collection = new ObservableCollection<string>();

        for(int i = 1; i < 100; i++)
        {
            collection.Add($"항목 {i}");
        }

        this.itemsRepeater.ItemsSource = collection;

        this.getItemButton.Click      += getItemButton_Click;
        this.getItemIndexButton.Click += getItemIndexButton_Click;
    }

    #endregion

    //////////////////////////////////////////////////////////////////////////////////////////////////// Method
    ////////////////////////////////////////////////////////////////////////////////////////// Public

    #region 항목 구하기 버튼 클릭시 처리하기 - getItemButton_Click(sender, e)

    /// <summary>
    /// 항목 구하기 버튼 클릭시 처리하기
    /// </summary>
    /// <param name="sender">이벤트 발생자</param>
    /// <param name="e">이벤트 인자</param>
    private void getItemButton_Click(object sender, RoutedEventArgs e)
    {
        TextBlock itemTextBlock = this.itemsRepeater.GetOrCreateElement(3) as TextBlock;

        this.messageTextBlock.Text = itemTextBlock.Text;
    }

    #endregion
    #region 항목 인덱스 구하기 버튼 클릭시 처리하기 - getItemIndexButton_Click(sender, e)

    /// <summary>
    /// 항목 인덱스 구하기 버튼 클릭시 처리하기
    /// </summary>
    /// <param name="sender">이벤트 발생자</param>
    /// <param name="e">이벤트 인자</param>
    private void getItemIndexButton_Click(object sender, RoutedEventArgs e)
    {
        TextBlock itemTextBlock = this.itemsRepeater.GetOrCreateElement(5) as TextBlock;

        int index = this.itemsRepeater.GetElementIndex(itemTextBlock);

        this.messageTextBlock.Text = $"항목 인덱스 : {index}";
    }

    #endregion
}

using System.Collections.ObjectModel;

using Microsoft.UI.Xaml;

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();

ObservableCollection<string> collection = new ObservableCollection<string>();

for(int i = 1; i < 100; i++)

{

collection.Add($"항목 {i}");

}

this.itemsRepeater.ItemsSource = collection;

this.getItemButton.Click += getItemButton_Click;

this.getItemIndexButton.Click += getItemIndexButton_Click;

}

#endregion

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

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

#region 항목 구하기 버튼 클릭시 처리하기 - getItemButton_Click(sender, e)

/// <summary>

/// 항목 구하기 버튼 클릭시 처리하기

/// </summary>

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

/// <param name="e">이벤트 인자</param>

private void getItemButton_Click(object sender, RoutedEventArgs e)

{

TextBlock itemTextBlock = this.itemsRepeater.GetOrCreateElement(3) as TextBlock;

this.messageTextBlock.Text = itemTextBlock.Text;

}

#endregion

#region 항목 인덱스 구하기 버튼 클릭시 처리하기 - getItemIndexButton_Click(sender, e)

/// <summary>

/// 항목 인덱스 구하기 버튼 클릭시 처리하기

/// </summary>

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

/// <param name="e">이벤트 인자</param>

private void getItemIndexButton_Click(object sender, RoutedEventArgs e)

{

TextBlock itemTextBlock = this.itemsRepeater.GetOrCreateElement(5) as TextBlock;

int index = this.itemsRepeater.GetElementIndex(itemTextBlock);

this.messageTextBlock.Text = $"항목 인덱스 : {index}";

}

#endregion

}

TestProject.zip