[C#/WINUI3/COMMUNITY TOOLKIT/.NET8] NullableBool 태그 확장 : Value 속성을 사용해 NULL 가능한 BOOL 값 설정하기

■ NullableBool 태그 확장의 Value 속성을 사용해 NULL 가능한 BOOL 값을 설정하는 방법을 보여준다.

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

▶ NullableBooleanObject.cs


using Microsoft.UI.Xaml;

namespace TestProject;

/// <summary>
/// NULL 가능 객체
/// </summary>
public class NullableBooleanObject : DependencyObject
{
    //////////////////////////////////////////////////////////////////////////////////////////////////// Dependency Property
    ////////////////////////////////////////////////////////////////////////////////////////// Static
    //////////////////////////////////////////////////////////////////////////////// Public

    #region NULL 가능 BOOL 의존 속성 - NullableBoolProperty

    /// <summary>
    /// NULL 가능 BOOL 의존 속성
    /// </summary>
    public static readonly DependencyProperty NullableBoolProperty = DependencyProperty.Register
    (
        nameof(NullableBool),
        typeof(bool?),
        typeof(NullableBooleanObject),
        new PropertyMetadata(null)
    );

    #endregion

    //////////////////////////////////////////////////////////////////////////////////////////////////// Property
    ////////////////////////////////////////////////////////////////////////////////////////// Public

    #region NULL 가능 BOOL - NullableBool

    /// <summary>
    /// NULL 가능 BOOL
    /// </summary>
    public bool? NullableBool
    {
        get => (bool?)GetValue(NullableBoolProperty);
        set => SetValue(NullableBoolProperty, value);
    }

    #endregion
}

using Microsoft.UI.Xaml;

namespace TestProject;

/// <summary>

/// NULL 가능 객체

/// </summary>

public class NullableBooleanObject : DependencyObject

{

//////////////////////////////////////////////////////////////////////////////////////////////////// Dependency Property

////////////////////////////////////////////////////////////////////////////////////////// Static

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

#region NULL 가능 BOOL 의존 속성 - NullableBoolProperty

/// <summary>

/// NULL 가능 BOOL 의존 속성

/// </summary>

public static readonly DependencyProperty NullableBoolProperty = DependencyProperty.Register

(

nameof(NullableBool),

typeof(bool?),

typeof(NullableBooleanObject),

new PropertyMetadata(null)

);

#endregion

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

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

#region NULL 가능 BOOL - NullableBool

/// <summary>

/// NULL 가능 BOOL

/// </summary>

public bool? NullableBool

{

get => (bool?)GetValue(NullableBoolProperty);

set => SetValue(NullableBoolProperty, value);

}

#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:local="using:TestProject"
    xmlns:ctw="using:CommunityToolkit.WinUI"
    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"
    FontFamily="나눔고딕코딩"
    FontSize="16">
    <Page.Resources>
        <local:NullableBooleanObject x:Name="nullableBooleanObject"
            NullableBool="{ctw:NullableBool Value={x:Null}}" />
    </Page.Resources>
    <TextBlock
        HorizontalAlignment="Center"
        VerticalAlignment="Center"
        Text="{Binding ElementName=nullableBooleanObject, Path=NullableBool}" />
</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:local="using:TestProject"

xmlns:ctw="using:CommunityToolkit.WinUI"

Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"

FontFamily="나눔고딕코딩"

FontSize="16">

<Page.Resources>

<local:NullableBooleanObject x:Name="nullableBooleanObject"

NullableBool="{ctw:NullableBool Value={x:Null}}" />

</Page.Resources>

<TextBlock

HorizontalAlignment="Center"

VerticalAlignment="Center"

Text="{Binding ElementName=nullableBooleanObject, Path=NullableBool}" />

</Page>

TestProject.zip