Update(Back-End): Converter Autors

Sources/BookApp/Composants/GroupCollection.xaml

@@ -3,9 +3,16 @@
              xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
              xmlns:composants="clr-namespace:BookApp.Composants"
              xmlns:model="clr-namespace:Model;assembly=Model"
+             xmlns:usecase="clr-namespace:BookApp.UseCase" 
              x:Name="ThisPage"
              x:Class="BookApp.Composants.GroupCollection">
 
+    <ContentView.Resources>
+        <ResourceDictionary>
+            <usecase:AuthorsListToStringConverter x:Key="authorsConverter"/>
+        </ResourceDictionary>
+    </ContentView.Resources>
+
     <CollectionView ItemsSource="{Binding AuteurGroups}" IsGrouped="True" SelectionMode="Single">
         <CollectionView.GroupHeaderTemplate>
             <DataTemplate x:DataType="model:Author">
@@ -52,7 +59,7 @@
                                 FontFamily="SF-Compact-Display-Bold"
                                 FontSize="18"
                                 TextColor="Black"/>
-                                <!-- <Label Text="{Binding Authors, Converter=}" FontFamily="SF-Compact-Display-Semibold" TextColor="Black"/> -->
+                                <Label Text="{Binding Authors, Converter={StaticResource authorsConverter}}" FontFamily="SF-Compact-Display-Semibold" TextColor="Black"/>
                                 <Label 
                                 TextColor="SlateGray"
                                 Text="{Binding Status}"/>

Sources/BookApp/Pages/DetailBook.xaml

@@ -4,6 +4,7 @@
 	xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
 	xmlns:toolkit="http://schemas.microsoft.com/dotnet/2022/maui/toolkit"
     xmlns:vm="clr-namespace:BookApp.ViewModel"
+    xmlns:usecase="clr-namespace:BookApp.UseCase" 
     x:Name="ThisPage"
     x:Class="BookApp.Pages.DetailBook">
 
@@ -49,6 +50,13 @@
             Grid.Column="1" />
         </Grid>
     </Shell.TitleView>
+
+    <ContentView.Resources>
+        <ResourceDictionary>
+            <usecase:AuthorsListToStringConverter x:Key="authorsConverter"/>
+        </ResourceDictionary>
+    </ContentView.Resources>
+    
     <ContentPage.Content>
         <ScrollView>
             <StackLayout>
@@ -85,7 +93,7 @@
                 </Grid>
                 <Rectangle Margin="25,0,0,10" HeightRequest="1" BackgroundColor="LightGray" VerticalOptions="End"/>
                 <Label FontAttributes="Bold" Margin="25,0,0,0" VerticalTextAlignment="Center"  Text="Auteur"/>
-                <Label Margin="25,0,0,0" VerticalTextAlignment="Center"  Text="{Binding BookDetail.Authors}"/>
+                <Label Margin="25,0,0,0" VerticalTextAlignment="Center"  Text="{Binding BookDetail.Authors, Converter={StaticResource authorsConverter}}"/>
                 <Rectangle Margin="25,10,0,10" HeightRequest="1" BackgroundColor="LightGray" VerticalOptions="End"/>
                 <Label FontAttributes="Bold" Margin="25,0,0,0" VerticalTextAlignment="Center"  Text="Maison d'édition"/>
                 <Label Margin="25,0,0,0" VerticalTextAlignment="Center"  Text="{Binding BookDetail.Authors}"/>

Sources/BookApp/UseCase/AuthorsListToStringConverter.cs

@@ -0,0 +1,28 @@
+using Model;
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BookApp.UseCase
+{
+    public class AuthorsListToStringConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value is List<Author> authorsList && authorsList.Any())
+            {
+                return string.Join(", ", authorsList.Select(a => a.Name));
+            }
+
+            return string.Empty;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}