[C#/MAUI/.NET6] Binding 태그 확장 : FallbackValue 속성을 사용해 바인딩 오류시 대체 값 설정하기

■ Binding 태그 확장의 FallbackValue 속성을 사용해 바인딩 오류시 대체 값을 설정하는 방법을 보여준다.

▶ MainPage.xaml


<?xml version="1.0" encoding="utf-8" ?>
<ContentPage x:Class="TestProject.MainPage" x:Name="page"
    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    xmlns:local="clr-namespace:TestProject">
    <Grid
        HorizontalOptions="Center"
        VerticalOptions="Center">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="10"   />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="Auto" />
            <ColumnDefinition Width="10"   />
            <ColumnDefinition Width="Auto" />
        </Grid.ColumnDefinitions>
        <Label Grid.Row="0" Grid.Column="0"
            Text="ID" />
        <Label Grid.Row="0" Grid.Column="2"
            Text="{Binding ID, FallbackValue=(NULL)}" />
        <Label Grid.Row="2" Grid.Column="0"
            Text="성명" />
        <Label Grid.Row="2" Grid.Column="2"
            Text="{Binding Name, FallbackValue=(NULL)}" />
    </Grid>
</ContentPage>

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

<ContentPage x:Class="TestProject.MainPage" x:Name="page"

xmlns="http://schemas.microsoft.com/dotnet/2021/maui"

xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"

xmlns:local="clr-namespace:TestProject">

<Grid

HorizontalOptions="Center"

VerticalOptions="Center">

<Grid.RowDefinitions>

</Grid.RowDefinitions>

<Grid.ColumnDefinitions>

</Grid.ColumnDefinitions>

<Label Grid.Row="0" Grid.Column="0"

Text="ID" />

<Label Grid.Row="0" Grid.Column="2"

Text="{Binding ID, FallbackValue=(NULL)}" />

<Label Grid.Row="2" Grid.Column="0"

Text="성명" />

<Label Grid.Row="2" Grid.Column="2"

Text="{Binding Name, FallbackValue=(NULL)}" />

</Grid>

</ContentPage>

TestProject.zip