ビューをビューモデルとバインドさせる

MainPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local ="clr-namespace:MauiApp1"
             x:Class="MauiApp1.MainPage">
    <ContentPage.BindingContext>
        <local:MainViewModel />
    </ContentPage.BindingContext>
    <ScrollView>
        <VerticalStackLayout Spacing="25" Padding="30">

            <Label 
                Text="Hello, World!"
                SemanticProperties.HeadingLevel="Level1"
                FontSize="32"
                HorizontalOptions="Center" />

            <Label 
                Text="Welcome to .NET Multi-platform App UI"
                SemanticProperties.HeadingLevel="Level1"
                SemanticProperties.Description="Welcome to dot net Multi platform App U I"
                FontSize="18"
                HorizontalOptions="Center" />

            <Label 
                Text="{Binding CounterText, Mode=OneWay}"
                FontSize="18"
                FontAttributes="Bold"
                x:Name="CounterLabel"
                HorizontalOptions="Center" />

            <Button 
                Text="Click me"
                FontAttributes="Bold"
                SemanticProperties.Hint="Counts the number of times you click"
                Command="{Binding CounterCommand}"
                HorizontalOptions="Center" />

            <Image
                Source="dotnet_bot.png"
                SemanticProperties.Description="Cute dot net bot waving hi to you!"
                WidthRequest="250"
                HeightRequest="310"
                HorizontalOptions="Center" />

        </VerticalStackLayout>
    </ScrollView>
</ContentPage>