[C#/WINUI3/.NET8] TreeView 엘리먼트 : ItemTemplateSelector 속성을 사용해 사진/음악 라이브러리 파일 조회하기

■ TreeView 엘리먼트의 ItemTemplateSelector 속성을 사용해 사진/음악 라이브러리 파일을 조회하는 방법을 보여준다.

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

▶ ExplorerItemTemplateSelector.cs


using Windows.Storage;

using Microsoft.UI.Xaml;
using Microsoft.UI.Xaml.Controls;

namespace TestProject;

/// <summary>
/// 항목 탐색기 템플리트 선택자
/// </summary>
public class ExplorerItemTemplateSelector : DataTemplateSelector
{
    //////////////////////////////////////////////////////////////////////////////////////////////////// Property
    ////////////////////////////////////////////////////////////////////////////////////////// Public

    #region 디폴트 템플리트 - DefaultTemplate

    /// <summary>
    /// 디폴트 템플리트
    /// </summary>
    public DataTemplate DefaultTemplate { get; set; }

    #endregion
    #region 음악 항목 템플리트 - MusicItemTemplate

    /// <summary>
    /// 음악 항목 템플리트
    /// </summary>
    public DataTemplate MusicItemTemplate { get; set; }

    #endregion
    #region 그림 항목 템플리트 - PictureItemTemplate

    /// <summary>
    /// 그림 항목 템플리트
    /// </summary>
    public DataTemplate PictureItemTemplate { get; set; }

    #endregion
    #region 음악 폴더 템플리트 - MusicFolderTemplate

    /// <summary>
    /// 음악 폴더 템플리트
    /// </summary>
    public DataTemplate MusicFolderTemplate { get; set; }

    #endregion
    #region 그림 폴더 템플리트 - PictureFolderTemplate

    /// <summary>
    /// 그림 폴더 템플리트
    /// </summary>
    public DataTemplate PictureFolderTemplate { get; set; }

    #endregion

    //////////////////////////////////////////////////////////////////////////////////////////////////// Method
    ////////////////////////////////////////////////////////////////////////////////////////// Protected

    #region 템플리트 선택하기 (코어) - SelectTemplateCore(item)

    /// <summary>
    /// 템플리트 선택하기 (코어)
    /// </summary>
    /// <param name="item">항목</param>
    /// <returns>데이터 템플리트</returns>
    protected override DataTemplate SelectTemplateCore(object item)
    {
        TreeViewNode treeViewNode = item as TreeViewNode;

        if(treeViewNode.Content is StorageFolder)
        {
            StorageFolder storageFolder = treeViewNode.Content as StorageFolder;

            if(storageFolder.DisplayName.StartsWith("Pictures"))
            {
                return PictureFolderTemplate;
            }

            if(storageFolder.DisplayName.StartsWith("Music"))
            {
                return MusicFolderTemplate;
            }
        }
        else if(treeViewNode.Content is StorageFile)
        {
            StorageFile storageFile = treeViewNode.Content as StorageFile;

            if(storageFile.ContentType.StartsWith("image"))
            {
                return PictureItemTemplate;
            }

            if(storageFile.ContentType.StartsWith("audio"))
            {
                return MusicItemTemplate;
            }
        }

        return DefaultTemplate;
    }

    #endregion
}

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using Windows.Storage;

using Microsoft.UI.Xaml;

using Microsoft.UI.Xaml.Controls;

namespace TestProject;

/// <summary>

/// 항목 탐색기 템플리트 선택자

/// </summary>

public class ExplorerItemTemplateSelector : DataTemplateSelector

{

//////////////////////////////////////////////////////////////////////////////////////////////////// Property

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

#region 디폴트 템플리트 - DefaultTemplate

/// <summary>

/// 디폴트 템플리트

/// </summary>

public DataTemplate DefaultTemplate { get; set; }

#endregion

#region 음악 항목 템플리트 - MusicItemTemplate

/// <summary>

/// 음악 항목 템플리트

/// </summary>

public DataTemplate MusicItemTemplate { get; set; }

#endregion

#region 그림 항목 템플리트 - PictureItemTemplate

/// <summary>

/// 그림 항목 템플리트

/// </summary>

public DataTemplate PictureItemTemplate { get; set; }

#endregion

#region 음악 폴더 템플리트 - MusicFolderTemplate

/// <summary>

/// 음악 폴더 템플리트

/// </summary>

public DataTemplate MusicFolderTemplate { get; set; }

#endregion

#region 그림 폴더 템플리트 - PictureFolderTemplate

/// <summary>

/// 그림 폴더 템플리트

/// </summary>

public DataTemplate PictureFolderTemplate { get; set; }

#endregion

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

////////////////////////////////////////////////////////////////////////////////////////// Protected

#region 템플리트 선택하기 (코어) - SelectTemplateCore(item)

/// <summary>

/// 템플리트 선택하기 (코어)

/// </summary>

/// <param name="item">항목</param>

/// <returns>데이터 템플리트</returns>

protected override DataTemplate SelectTemplateCore(object item)

{

TreeViewNode treeViewNode = item as TreeViewNode;

if(treeViewNode.Content is StorageFolder)

{

StorageFolder storageFolder = treeViewNode.Content as StorageFolder;

if(storageFolder.DisplayName.StartsWith("Pictures"))

{

return PictureFolderTemplate;

}

if(storageFolder.DisplayName.StartsWith("Music"))

{

return MusicFolderTemplate;

}

else if(treeViewNode.Content is StorageFile)

{

StorageFile storageFile = treeViewNode.Content as StorageFile;

if(storageFile.ContentType.StartsWith("image"))

{

return PictureItemTemplate;

}

if(storageFile.ContentType.StartsWith("audio"))

{

return MusicItemTemplate;

}

return DefaultTemplate;

}

#endregion

}

▶ 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"
    xmlns:ws="using:Windows.Storage"
    xmlns:local="using:TestProject"
    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"
    FontFamily="나눔고딕코딩"
    FontSize="16">
    <Page.Resources>
        <DataTemplate x:Key="DefaultTreeViewNodeDataTemplateKey" x:DataType="TreeViewNode">
            <Grid Height="50">
                <TextBlock
                    Style="{ThemeResource BodyTextBlockStyle}"
                    HorizontalAlignment="Left"
                    VerticalAlignment="Center"
                    Text="{x:Bind ((ws:IStorageItem)Content).Name}" />
            </Grid>
        </DataTemplate>
        <DataTemplate x:Key="MusicItemTreeViewNodeDataTemplateKey" x:DataType="TreeViewNode">
            <StackPanel Height="50"
                Orientation="Horizontal">
                <SymbolIcon
                    Margin="0 0 5 0"
                    Symbol="Audio" />
                <TextBlock
                    Style="{ThemeResource BodyTextBlockStyle}"
                    HorizontalAlignment="Left"
                    VerticalAlignment="Center"
                    Text="{x:Bind ((ws:StorageFile)Content).DisplayName}" />
            </StackPanel>
        </DataTemplate>
        <DataTemplate x:Key="PictureItemTreeViewNodeDataTemplateKey" x:DataType="TreeViewNode">
            <StackPanel Height="50"
                Orientation="Horizontal">
                <FontIcon
                    Margin="0 0 5 0"
                    FontFamily="Segoe MDL2 Assets"
                    Glyph="&#xEB9F;" />
                <TextBlock
                    Style="{ThemeResource BodyTextBlockStyle}"
                    HorizontalAlignment="Left"
                    VerticalAlignment="Center"
                    Text="{x:Bind ((ws:StorageFile)Content).DisplayName}" />
            </StackPanel>
        </DataTemplate>
        <DataTemplate x:Key="MusicFolderTreeViewNodeDataTemplateKey" x:DataType="TreeViewNode">
            <StackPanel
                Height="50"
                Orientation="Horizontal">
                <SymbolIcon
                    Margin="0 0 5 0"
                    Symbol="MusicInfo" />
                <TextBlock
                    Style="{ThemeResource BodyTextBlockStyle}"
                    HorizontalAlignment="Left"
                    VerticalAlignment="Center"
                    Text="{x:Bind ((ws:StorageFolder)Content).DisplayName}" />
            </StackPanel>
        </DataTemplate>
        <DataTemplate x:Key="PictureFolderTreeViewNodeDataTemplateKey" x:DataType="TreeViewNode">
            <StackPanel
                Height="50"
                Orientation="Horizontal">
                <SymbolIcon
                    Margin="0 0 5 0"
                    Symbol="Pictures" />
                <TextBlock
                    Style="{ThemeResource BodyTextBlockStyle}"
                    HorizontalAlignment="Left"
                    VerticalAlignment="Center"
                    Text="{x:Bind ((ws:StorageFolder)Content).DisplayName}" />
            </StackPanel>
        </DataTemplate>
        <local:ExplorerItemTemplateSelector x:Key="ExplorerItemTemplateSelectorKey"
            DefaultTemplate="{StaticResource DefaultTreeViewNodeDataTemplateKey}"
            MusicItemTemplate="{StaticResource MusicItemTreeViewNodeDataTemplateKey}"
            MusicFolderTemplate="{StaticResource MusicFolderTreeViewNodeDataTemplateKey}"
            PictureItemTemplate="{StaticResource PictureItemTreeViewNodeDataTemplateKey}"
            PictureFolderTemplate="{StaticResource PictureFolderTreeViewNodeDataTemplateKey}" />
    </Page.Resources>
    <SplitView
        Margin="10"
        OpenPaneLength="300"
        DisplayMode="Inline"
        IsPaneOpen="True">
        <SplitView.Pane>
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition Height="Auto" />
                    <RowDefinition Height="*"    />
                </Grid.RowDefinitions>
                <Button Name="refreshButton" Grid.Row="0"
                    Padding="10"
                    Content="Refresh tree" />
                <TreeView Name="treeView" Grid.Row="1"
                    Margin="0 10 0 0"
                    ItemTemplateSelector="{StaticResource ExplorerItemTemplateSelectorKey}"
                    SelectionMode="Single" />
            </Grid>
        </SplitView.Pane>
        <StackPanel
            HorizontalAlignment="Left"
            VerticalAlignment="Center"
            Padding="10"
            Spacing="10">
            <TextBlock
                Style="{StaticResource CaptionTextBlockStyle}"
                Text="File name : " />
            <TextBlock Name="fileNameTextBlock"
                Margin="0 0 0 10" />
            <TextBlock
                Style="{StaticResource CaptionTextBlockStyle}"
                Text="File path : " />
            <TextBlock Name="filePathTextBlock"
                Margin="0 0 0 10" />
            <TextBlock
                Style="{StaticResource CaptionTextBlockStyle}"
                Text="Tree depth : " />
            <TextBlock Name="treeDepthTextBlock"
                Margin="0 0 0 10" />
        </StackPanel>
    </SplitView>
</Page>

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<?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"

xmlns:ws="using:Windows.Storage"

xmlns:local="using:TestProject"

Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"

FontFamily="나눔고딕코딩"

FontSize="16">

<Page.Resources>

<TextBlock

Style="{ThemeResource BodyTextBlockStyle}"

HorizontalAlignment="Left"

VerticalAlignment="Center"

Text="{x:Bind ((ws:IStorageItem)Content).Name}" />

</Grid>

</DataTemplate>

<StackPanel Height="50"

Orientation="Horizontal">

<SymbolIcon

Margin="0 0 5 0"

Symbol="Audio" />

<TextBlock

Style="{ThemeResource BodyTextBlockStyle}"

HorizontalAlignment="Left"

VerticalAlignment="Center"

Text="{x:Bind ((ws:StorageFile)Content).DisplayName}" />

</StackPanel>

</DataTemplate>

<StackPanel Height="50"

Orientation="Horizontal">

<FontIcon

Margin="0 0 5 0"

FontFamily="Segoe MDL2 Assets"

Glyph="" />

<TextBlock

Style="{ThemeResource BodyTextBlockStyle}"

HorizontalAlignment="Left"

VerticalAlignment="Center"

Text="{x:Bind ((ws:StorageFile)Content).DisplayName}" />

</StackPanel>

</DataTemplate>

<StackPanel

Height="50"

Orientation="Horizontal">

<SymbolIcon

Margin="0 0 5 0"

Symbol="MusicInfo" />

<TextBlock

Style="{ThemeResource BodyTextBlockStyle}"

HorizontalAlignment="Left"

VerticalAlignment="Center"

Text="{x:Bind ((ws:StorageFolder)Content).DisplayName}" />

</StackPanel>

</DataTemplate>

<StackPanel

Height="50"

Orientation="Horizontal">

<SymbolIcon

Margin="0 0 5 0"

Symbol="Pictures" />

<TextBlock

Style="{ThemeResource BodyTextBlockStyle}"

HorizontalAlignment="Left"

VerticalAlignment="Center"

Text="{x:Bind ((ws:StorageFolder)Content).DisplayName}" />

</StackPanel>

</DataTemplate>

<local:ExplorerItemTemplateSelector x:Key="ExplorerItemTemplateSelectorKey"

DefaultTemplate="{StaticResource DefaultTreeViewNodeDataTemplateKey}"

MusicItemTemplate="{StaticResource MusicItemTreeViewNodeDataTemplateKey}"

MusicFolderTemplate="{StaticResource MusicFolderTreeViewNodeDataTemplateKey}"

PictureItemTemplate="{StaticResource PictureItemTreeViewNodeDataTemplateKey}"

PictureFolderTemplate="{StaticResource PictureFolderTreeViewNodeDataTemplateKey}" />

</Page.Resources>

<SplitView

Margin="10"

OpenPaneLength="300"

DisplayMode="Inline"

IsPaneOpen="True">

<SplitView.Pane>

<Grid>

<Grid.RowDefinitions>

</Grid.RowDefinitions>

<Button Name="refreshButton" Grid.Row="0"

Padding="10"

Content="Refresh tree" />

<TreeView Name="treeView" Grid.Row="1"

Margin="0 10 0 0"

ItemTemplateSelector="{StaticResource ExplorerItemTemplateSelectorKey}"

SelectionMode="Single" />

</Grid>

</SplitView.Pane>

<StackPanel

HorizontalAlignment="Left"

VerticalAlignment="Center"

Padding="10"

Spacing="10">

<TextBlock

Style="{StaticResource CaptionTextBlockStyle}"

Text="File name : " />

<TextBlock Name="fileNameTextBlock"

Margin="0 0 0 10" />

<TextBlock

Style="{StaticResource CaptionTextBlockStyle}"

Text="File path : " />

<TextBlock Name="filePathTextBlock"

Margin="0 0 0 10" />

<TextBlock

Style="{StaticResource CaptionTextBlockStyle}"

Text="Tree depth : " />

<TextBlock Name="treeDepthTextBlock"

Margin="0 0 0 10" />

</StackPanel>

</SplitView>

</Page>

▶ MainPage.xaml.cs


using System;
using System.Collections.Generic;

using Windows.Storage;

using Microsoft.UI.Xaml.Controls;
using Microsoft.UI.Xaml;

namespace TestProject;

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

    #region 생성자 - MainPage()

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

        this.refreshButton.Click  += refreshButton_Click;
        this.treeView.Expanding   += treeView_Expanding;
        this.treeView.Collapsed   += treeView_Collapsed;
        this.treeView.ItemInvoked += treeView_ItemInvoked;

        InitializeTreeView();
    }

    #endregion

    //////////////////////////////////////////////////////////////////////////////////////////////////// Method
    ////////////////////////////////////////////////////////////////////////////////////////// Private
    //////////////////////////////////////////////////////////////////////////////// Event

    #region Refresh 버튼 클릭시 처리하기 - refreshButton_Click(sender, e)

    /// <summary>
    /// Refresh 버튼 클릭시 처리하기
    /// </summary>
    /// <param name="sender">이벤트 발생자</param>
    /// <param name="e">이벤트 인자</param>
    private void refreshButton_Click(object sender, RoutedEventArgs e)
    {
        this.treeView.RootNodes.Clear();

        InitializeTreeView();
    }

    #endregion
    #region 트리뷰 확장시 처리하기 - treeView_Expanding(sender, e)

    /// <summary>
    /// 트리뷰 확장시 처리하기
    /// </summary>
    /// <param name="sender">이벤트 발생자</param>
    /// <param name="e">이벤트 인자</param>
    private void treeView_Expanding(TreeView sender, TreeViewExpandingEventArgs e)
    {
        if(e.Node.HasUnrealizedChildren)
        {
            AddChildTreeViewNode(e.Node);
        }
    }

    #endregion
    #region 트리뷰 축소시 처리하기 - treeView_Collapsed(sender, e)

    /// <summary>
    /// 트리뷰 축소시 처리하기
    /// </summary>
    /// <param name="sender">이벤트 발생자</param>
    /// <param name="e">이벤트 인자</param>
    private void treeView_Collapsed(TreeView sender, TreeViewCollapsedEventArgs e)
    {
        e.Node.Children.Clear();

        e.Node.HasUnrealizedChildren = true;
    }

    #endregion
    #region 트리뷰 항목 호출시 처리하기 - treeView_ItemInvoked(sender, e)

    /// <summary>
    /// 트리뷰 항목 호출시 처리하기
    /// </summary>
    /// <param name="sender">이벤트 발생자</param>
    /// <param name="e">이벤트 인자</param>
    private void treeView_ItemInvoked(TreeView sender, TreeViewItemInvokedEventArgs e)
    {
        TreeViewNode treeViewNode = e.InvokedItem as TreeViewNode;

        if(treeViewNode.Content is IStorageItem storageItem)
        {
            this.fileNameTextBlock.Text  = storageItem.Name;
            this.filePathTextBlock.Text  = storageItem.Path;
            this.treeDepthTextBlock.Text = treeViewNode.Depth.ToString();

            if(treeViewNode.Content is StorageFolder)
            {
                treeViewNode.IsExpanded = !treeViewNode.IsExpanded;
            }
        }
    }

    #endregion

    //////////////////////////////////////////////////////////////////////////////// Function

    #region 트리뷰 초기화하기 - InitializeTreeView()

    /// <summary>
    /// 트리뷰 초기화하기
    /// </summary>
    private void InitializeTreeView()
    {
        StorageFolder pictureStorageFolder = KnownFolders.PicturesLibrary;

        TreeViewNode pictureTreeViewNode = new TreeViewNode();

        pictureTreeViewNode.Content               = pictureStorageFolder;
        pictureTreeViewNode.IsExpanded            = true;
        pictureTreeViewNode.HasUnrealizedChildren = true;

        this.treeView.RootNodes.Add(pictureTreeViewNode);

        AddChildTreeViewNode(pictureTreeViewNode);

        StorageFolder musicStorageFolder = KnownFolders.MusicLibrary;

        TreeViewNode musicTreeViewNode = new TreeViewNode();

        musicTreeViewNode.Content               = musicStorageFolder;
        musicTreeViewNode.IsExpanded            = true;
        musicTreeViewNode.HasUnrealizedChildren = true;

        this.treeView.RootNodes.Add(musicTreeViewNode);

        AddChildTreeViewNode(musicTreeViewNode);
    }

    #endregion
    #region 자식 트리뷰 노드 추가하기 - AddChildTreeViewNode(parentTreeViewNode)

    /// <summary>
    /// 자식 트리뷰 노드 추가하기
    /// </summary>
    /// <param name="parentTreeViewNode">부모 트리뷰 노드</param>
    private async void AddChildTreeViewNode(TreeViewNode parentTreeViewNode)
    {
        StorageFolder storageFolder = null;

        if(parentTreeViewNode.Content is StorageFolder && parentTreeViewNode.HasUnrealizedChildren == true)
        {
            storageFolder = parentTreeViewNode.Content as StorageFolder;
        }
        else
        {
            return;
        }

        IReadOnlyList<IStorageItem> storageItemList = await storageFolder.GetItemsAsync();

        if(storageItemList.Count == 0)
        {
            return;
        }

        foreach(IStorageItem storageItem in storageItemList)
        {
            TreeViewNode childTreeViewNode = new TreeViewNode();

            childTreeViewNode.Content = storageItem;

            if(storageItem is StorageFolder)
            {
                childTreeViewNode.HasUnrealizedChildren = true;
            }

            parentTreeViewNode.Children.Add(childTreeViewNode);
        }

        parentTreeViewNode.HasUnrealizedChildren = false;
    }

    #endregion
}

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using System;

using System.Collections.Generic;

using Windows.Storage;

using Microsoft.UI.Xaml.Controls;

using Microsoft.UI.Xaml;

namespace TestProject;

/// <summary>

/// 메인 페이지

/// </summary>

public sealed partial class MainPage : Page

{

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

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

#region 생성자 - MainPage()

/// <summary>

/// 생성자

/// </summary>

public MainPage()

{

InitializeComponent();

this.refreshButton.Click += refreshButton_Click;

this.treeView.Expanding += treeView_Expanding;

this.treeView.Collapsed += treeView_Collapsed;

this.treeView.ItemInvoked += treeView_ItemInvoked;

InitializeTreeView();

}

#endregion

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

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

//////////////////////////////////////////////////////////////////////////////// Event

#region Refresh 버튼 클릭시 처리하기 - refreshButton_Click(sender, e)

/// <summary>

/// Refresh 버튼 클릭시 처리하기

/// </summary>

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

/// <param name="e">이벤트 인자</param>

private void refreshButton_Click(object sender, RoutedEventArgs e)

{

this.treeView.RootNodes.Clear();

InitializeTreeView();

}

#endregion

#region 트리뷰 확장시 처리하기 - treeView_Expanding(sender, e)

/// <summary>

/// 트리뷰 확장시 처리하기

/// </summary>

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

/// <param name="e">이벤트 인자</param>

private void treeView_Expanding(TreeView sender, TreeViewExpandingEventArgs e)

{

if(e.Node.HasUnrealizedChildren)

{

AddChildTreeViewNode(e.Node);

}

#endregion

#region 트리뷰 축소시 처리하기 - treeView_Collapsed(sender, e)

/// <summary>

/// 트리뷰 축소시 처리하기

/// </summary>

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

/// <param name="e">이벤트 인자</param>

private void treeView_Collapsed(TreeView sender, TreeViewCollapsedEventArgs e)

{

e.Node.Children.Clear();

e.Node.HasUnrealizedChildren = true;

}

#endregion

#region 트리뷰 항목 호출시 처리하기 - treeView_ItemInvoked(sender, e)

/// <summary>

/// 트리뷰 항목 호출시 처리하기

/// </summary>

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

/// <param name="e">이벤트 인자</param>

private void treeView_ItemInvoked(TreeView sender, TreeViewItemInvokedEventArgs e)

{

TreeViewNode treeViewNode = e.InvokedItem as TreeViewNode;

if(treeViewNode.Content is IStorageItem storageItem)

{

this.fileNameTextBlock.Text = storageItem.Name;

this.filePathTextBlock.Text = storageItem.Path;

this.treeDepthTextBlock.Text = treeViewNode.Depth.ToString();

if(treeViewNode.Content is StorageFolder)

{

treeViewNode.IsExpanded = !treeViewNode.IsExpanded;

}

#endregion

//////////////////////////////////////////////////////////////////////////////// Function

#region 트리뷰 초기화하기 - InitializeTreeView()

/// <summary>

/// 트리뷰 초기화하기

/// </summary>

private void InitializeTreeView()

{

StorageFolder pictureStorageFolder = KnownFolders.PicturesLibrary;

TreeViewNode pictureTreeViewNode = new TreeViewNode();

pictureTreeViewNode.Content = pictureStorageFolder;

pictureTreeViewNode.IsExpanded = true;

pictureTreeViewNode.HasUnrealizedChildren = true;

this.treeView.RootNodes.Add(pictureTreeViewNode);

AddChildTreeViewNode(pictureTreeViewNode);

StorageFolder musicStorageFolder = KnownFolders.MusicLibrary;

TreeViewNode musicTreeViewNode = new TreeViewNode();

musicTreeViewNode.Content = musicStorageFolder;

musicTreeViewNode.IsExpanded = true;

musicTreeViewNode.HasUnrealizedChildren = true;

this.treeView.RootNodes.Add(musicTreeViewNode);

AddChildTreeViewNode(musicTreeViewNode);

}

#endregion

#region 자식 트리뷰 노드 추가하기 - AddChildTreeViewNode(parentTreeViewNode)

/// <summary>

/// 자식 트리뷰 노드 추가하기

/// </summary>

/// <param name="parentTreeViewNode">부모 트리뷰 노드</param>

private async void AddChildTreeViewNode(TreeViewNode parentTreeViewNode)

{

StorageFolder storageFolder = null;

if(parentTreeViewNode.Content is StorageFolder && parentTreeViewNode.HasUnrealizedChildren == true)

{

storageFolder = parentTreeViewNode.Content as StorageFolder;

}

else

{

return;

}

IReadOnlyList<IStorageItem> storageItemList = await storageFolder.GetItemsAsync();

if(storageItemList.Count == 0)

{

return;

}

foreach(IStorageItem storageItem in storageItemList)

{

TreeViewNode childTreeViewNode = new TreeViewNode();

childTreeViewNode.Content = storageItem;

if(storageItem is StorageFolder)

{

childTreeViewNode.HasUnrealizedChildren = true;

}

parentTreeViewNode.Children.Add(childTreeViewNode);

}

parentTreeViewNode.HasUnrealizedChildren = false;

}

#endregion

}

TestProject.zip

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.NET8 C# CONTROL LAYOUT MICROSOFT UNPACKAGED WINUI3

icodebroker

[C#/WINUI3/.NET8] TreeView 엘리먼트 : ItemTemplateSelector 속성을 사용해 사진/음악 라이브러리 파일 조회하기

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