[C#/WINUI3/COMMUNITY TOOLKIT/.NET8] EmptyCollectionToObjectConverter 엘리먼트 : EmptyValue/NotEmptyValue 속성을 사용해 컬렉션 항목 수→객체 값 변환자 설정하기

■ EmptyCollectionToObjectConverter 엘리먼트의 EmptyValue/NotEmptyValue 속성을 사용해 컬렉션 항목 수→객체 값 변환자를 설정하는 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"
    xmlns:ctwcv="using:CommunityToolkit.WinUI.Converters"
    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"
    FontFamily="나눔고딕코딩"
    FontSize="16">
    <Page.Resources>
        <ctwcv:EmptyCollectionToObjectConverter x:Key="EmptyCollectionToObjectConverterKey"
             EmptyValue="Visible"
             NotEmptyValue="Collapse" />
    </Page.Resources>
    <Grid>
        <TextBlock
            HorizontalAlignment="Center"
            VerticalAlignment="Center"
            TextAlignment="Center"
            Visibility="{x:Bind EmptyStringCollection, Mode=OneWay, Converter={StaticResource EmptyCollectionToObjectConverterKey}}">
            <Run
                FontWeight="SemiBold"
                Text="All done for the day" />
            <LineBreak />
            <Run
                Foreground="{ThemeResource TextFillColorSecondaryBrush}"
                Text="Enjoy your empty inbox" />
        </TextBlock>
    </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"

xmlns:ctwcv="using:CommunityToolkit.WinUI.Converters"

Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"

FontFamily="나눔고딕코딩"

FontSize="16">

<Page.Resources>

<ctwcv:EmptyCollectionToObjectConverter x:Key="EmptyCollectionToObjectConverterKey"

EmptyValue="Visible"

NotEmptyValue="Collapse" />

</Page.Resources>

<Grid>

<TextBlock

HorizontalAlignment="Center"

VerticalAlignment="Center"

TextAlignment="Center"

Visibility="{x:Bind EmptyStringCollection, Mode=OneWay, Converter={StaticResource EmptyCollectionToObjectConverterKey}}">

<Run

FontWeight="SemiBold"

Text="All done for the day" />

<Run

Foreground="{ThemeResource TextFillColorSecondaryBrush}"

Text="Enjoy your empty inbox" />

</TextBlock>

</Grid>

</Page>

▶ MainPage.xaml.cs


using System.Collections.ObjectModel;

using Microsoft.UI.Xaml.Controls;

namespace TestProject;

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

    #region Field

    /// <summary>
    /// 빈 문자열 컬렉션
    /// </summary>
    public ObservableCollection<string> EmptyStringCollection = [];

    #endregion

    //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor
    ////////////////////////////////////////////////////////////////////////////////////////// Public

    #region 생성자 - MainPage()

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

    #endregion
}

using System.Collections.ObjectModel;

using Microsoft.UI.Xaml.Controls;

namespace TestProject;

/// <summary>

/// 메인 페이지

/// </summary>

public sealed partial class MainPage : Page

{

//////////////////////////////////////////////////////////////////////////////////////////////////// Field

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

#region Field

/// <summary>

/// 빈 문자열 컬렉션

/// </summary>

public ObservableCollection<string> EmptyStringCollection = [];

#endregion

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

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

#region 생성자 - MainPage()

/// <summary>

/// 생성자

/// </summary>

public MainPage()

{

InitializeComponent();

}

#endregion

}

TestProject.zip