[init:] database service for a following implementation

Reviewed-on: #77

DataStore/DatabaseService.cs

@@ -0,0 +1,166 @@
+using System;
+using System.Threading.Tasks;
+using Microsoft.EntityFrameworkCore;
+
+namespace Logof_Client;
+
+/// <summary>
+/// Zentrale Datenbankverwaltung für Logof Client.
+/// 
+/// Zuständig für:
+/// - PostgreSQL-Verbindung
+/// - EF Core DbContext
+/// - Datenbankmodelle
+/// - Migrationen
+/// - Verbindungstest
+/// </summary>
+public static class DatabseService
+{
+    private static DbContextOptions<LogofDbContext>? _options;
+
+    /// <summary>
+    /// Initialisiert die Datenbankverbindung.
+    /// Sollte einmal beim Programmstart aufgerufen werden.
+    /// </summary>
+    public static void Initialize(string connectionString)
+    {
+        if (string.IsNullOrWhiteSpace(connectionString))
+            throw new ArgumentException(
+                "Kein Datenbank-Connection-String angegeben.",
+                nameof(connectionString));
+
+        var builder = new DbContextOptionsBuilder<LogofDbContext>();
+
+        builder.UseNpgsql(connectionString);
+
+        _options = builder.Options;
+    }
+
+    /// <summary>
+    /// Erstellt einen neuen DbContext.
+    /// </summary>
+    public static LogofDbContext GetContext()
+    {
+        if (_options == null)
+            throw new InvalidOperationException(
+                "DB wurde noch nicht initialisiert. " +
+                "Rufen Sie DB.Initialize(...) auf.");
+
+        return new LogofDbContext(_options);
+    }
+
+    /// <summary>
+    /// Testet die Verbindung zum Datenbankserver.
+    /// </summary>
+    public static async Task<bool> TestConnectionAsync()
+    {
+        try
+        {
+            await using var db = GetContext();
+            return await db.Database.CanConnectAsync();
+        }
+        catch
+        {
+            return false;
+        }
+    }
+
+    /// <summary>
+    /// Erstellt bzw. aktualisiert das Datenbankschema
+    /// anhand der vorhandenen EF-Core-Migrationen.
+    /// </summary>
+    public static async Task MigrateAsync()
+    {
+        await using var db = GetContext();
+
+        await db.Database.MigrateAsync();
+    }
+}
+
+
+// ============================================================================
+// DATABASE CONTEXT
+// ============================================================================
+
+public class LogofDbContext : DbContext
+{
+    public DbSet<CustomerEx> Customers => Set<CustomerEx>();
+
+    public LogofDbContext(
+        DbContextOptions<LogofDbContext> options)
+        : base(options)
+    {
+    }
+
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        base.OnModelCreating(modelBuilder);
+
+        // --------------------------------------------------------------------
+        // Customer
+        // --------------------------------------------------------------------
+
+        modelBuilder.Entity<CustomerEx>(entity =>
+        {
+            entity.ToTable("customers");
+
+            entity.HasKey(x => x.Id);
+
+            entity.Property(x => x.Id)
+                .ValueGeneratedOnAdd();
+
+            entity.Property(x => x.Name)
+                .HasMaxLength(255)
+                .IsRequired();
+
+            entity.Property(x => x.Description)
+                .HasMaxLength(4000);
+
+            entity.Property(x => x.SenderAddress)
+                .HasMaxLength(4000);
+
+            entity.Property(x => x.Separator)
+                .HasMaxLength(1)
+                .IsRequired();
+
+            // Optimistic Concurrency
+            entity.Property(x => x.Version)
+                .IsConcurrencyToken();
+
+            entity.Property(x => x.CreatedAt)
+                .IsRequired();
+
+            entity.Property(x => x.UpdatedAt)
+                .IsRequired();
+        });
+    }
+}
+
+
+// ============================================================================
+// DATABASE MODELS
+// ============================================================================
+
+public class CustomerEx
+{
+    public long Id { get; set; }
+
+    public string Name { get; set; } = "";
+
+    public string Description { get; set; } = "";
+
+    public string SenderAddress { get; set; } = "";
+
+    public char Separator { get; set; } = ',';
+
+    /// <summary>
+    /// Wird bei jeder Änderung erhöht.
+    /// Verhindert, dass zwei Benutzer sich gegenseitig
+    /// Änderungen überschreiben.
+    /// </summary>
+    public long Version { get; set; } = 1;
+
+    public DateTime CreatedAt { get; set; }
+
+    public DateTime UpdatedAt { get; set; }
+}

DataStore/SchemaMigration.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using Newtonsoft.Json.Linq;
+using Newtonsoft.Json;
 
 namespace Logof_Client;
 
@@ -12,7 +13,7 @@ namespace Logof_Client;
 public static class SchemaMigration
 {
     // Current schema version - increment when you make breaking changes
-    public const int CURRENT_SCHEMA_VERSION = 3;
+    public const int CURRENT_SCHEMA_VERSION = 4;
     
     // Dictionary of migration functions, keyed by the version they migrate TO
     private static readonly Dictionary<int, Func<JObject, JObject>> Migrations = new()
@@ -22,7 +23,7 @@ public static class SchemaMigration
         // { 2, MigrateV1ToV2 },
         
         // Example: Migration from v2 to v3
-        // { 3, MigrateV2ToV3 },
+        { 4, MigrateV3ToV4 },
     };
 
     /// <summary>
@@ -93,12 +94,12 @@ public static class SchemaMigration
     /// Example migration function: from v2 to v3.
     /// Add a new required field with a default value.
     /// </summary>
-    private static JObject MigrateV2ToV3(JObject obj)
+    private static JObject MigrateV3ToV4(JObject obj)
     {
         // Example: Add a new field that didn't exist before
-        if (!obj.ContainsKey("new_required_field"))
+        if (!obj.ContainsKey("moduleConfig"))
         {
-            obj["new_required_field"] = "default_value";
+            obj["moduleConfig"] = JToken.FromObject(new ModuleConfig());
         }
 
         return obj;

DataStore/Settings.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Reflection;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
 
@@ -19,6 +20,8 @@ public class Settings
     public Customers customers = new();
     public PdfExportSettings pdfExport { get; set; } = new();
 
+    public ModuleConfig moduleConfig { get; set; } = new ModuleConfig();
+
     public Settings()
     {
         _instance = this;
@@ -70,6 +73,29 @@ public class Settings
     }
 }
 
+public class ModuleConfig
+{
+    /// <summary>
+    /// Contains enabled modules and whether it's password-protected or not (non-existing-feature but soon)
+    /// </summary>
+    public List<(LCModule, bool)> EnabledModules = new();
+    public ModuleConfig()
+    {
+        EnabledModules = new List<(LCModule,bool)>();
+    }
+}
+
+public enum LCModule
+{
+    Addressmanagement,
+    Pricemanagement,
+    Wiki,
+    Staffmanagement,
+    UnifiedEndpointManagement,
+    Financemanagement
+}
+
+
 public class PdfExportSettings
 {
     public double cellPaddingTopMm { get; set; } = 4;

Logof Client.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
         <OutputType>WinExe</OutputType>
-        <TargetFramework>net9.0</TargetFramework>
+        <TargetFramework>net10.0</TargetFramework>
         <Nullable>enable</Nullable>
         <BuiltInComInteropSupport>true</BuiltInComInteropSupport>
         <ApplicationManifest>app.manifest</ApplicationManifest>
@@ -24,6 +24,9 @@
         <PackageReference Include="Markdown.Avalonia" Version="11.0.3" />
         <PackageReference Include="Newtonsoft.Json" Version="13.0.4" />
         <PackageReference Include="PdfSharp" Version="6.1.1" />
+        <PackageReference Include="Microsoft.EntityFrameworkCore" Version="10.0.12" />
+        <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="10.0.12" />
+        <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="10.0.3" />
     </ItemGroup>
 
     <ItemGroup>
@@ -71,4 +74,11 @@
 
         <Folder Include="assets\fonts\" />
     </ItemGroup>
+
+    <ItemGroup>
+      <Compile Update="PreviewWindow.axaml.cs">
+        <DependentUpon>PreviewWindow.axaml</DependentUpon>
+        <SubType>Code</SubType>
+      </Compile>
+    </ItemGroup>
 </Project>

MainWindow.axaml

@@ -22,7 +22,7 @@
                 </MenuItem>
             </Menu>
             <TabControl Grid.Row="1">
-                <TabItem>
+                <TabItem IsVisible="False" x:Name="Addressmanagement">
                     <TabItem.Header>
                         <StackPanel Orientation="Horizontal">
                             <LucideIcon Kind="MapPinHouse" Width="32" Height="32" Size="32" />
@@ -79,6 +79,14 @@
                                                     </StackPanel>
                                                 </MenuItem.Header>
                                             </MenuItem>
+                                            <MenuItem x:Name="MnIAdSetView" Click="MnIAdSetView_OnClick">
+                                                <MenuItem.Header>
+                                                    <StackPanel Orientation="Horizontal">
+                                                        <LucideIcon Kind="Eye" Width="12" Height="12" Size="12" />
+                                                        <Label Content="Anzeigen" VerticalContentAlignment="Center" />
+                                                    </StackPanel>
+                                                </MenuItem.Header>
+                                            </MenuItem>
                                             <MenuItem x:Name="MnIAdSetDelete" Click="MnIAdSetDelete_OnClick" IsEnabled="True">
                                                 <MenuItem.Header>
                                                     <StackPanel Orientation="Horizontal">
@@ -388,7 +396,7 @@
                         </Grid>
                     </Grid>
                 </TabItem>
-                <TabItem IsEnabled="False">
+                <TabItem IsEnabled="False" IsVisible="False" x:Name="Staffmanagement">
                     <TabItem.Header>
                         <StackPanel Orientation="Horizontal">
                             <LucideIcon Kind="Users" Width="32" Height="32" Size="32" />
@@ -396,7 +404,7 @@
                         </StackPanel>
                     </TabItem.Header>
                 </TabItem>
-                <TabItem IsEnabled="False">
+                <TabItem IsEnabled="False" IsVisible="False" x:Name="Financemanagement">
                     <TabItem.Header>
                         <StackPanel Orientation="Horizontal">
                             <LucideIcon Kind="BadgeEuro" Width="32" Height="32" Size="32" />
@@ -404,7 +412,7 @@
                         </StackPanel>
                     </TabItem.Header>
                 </TabItem>
-                <TabItem IsEnabled="False">
+                <TabItem IsEnabled="False" IsVisible="False" x:Name="Pricemanagement">
                     <TabItem.Header>
                         <StackPanel Orientation="Horizontal">
                             <LucideIcon Kind="ReceiptEuro" Width="32" Height="32" Size="32" />
@@ -412,7 +420,15 @@
                         </StackPanel>
                     </TabItem.Header>
                 </TabItem>
-                <TabItem IsEnabled="True">
+                <TabItem IsEnabled="False" IsVisible="False" x:Name="UnifiedEndpointManagement">
+                    <TabItem.Header>
+                        <StackPanel Orientation="Horizontal">
+                            <LucideIcon Kind="MonitorCog" Width="32" Height="32" Size="32" />
+                            <Label FontSize="20" Content="UEM" VerticalContentAlignment="Center" />
+                        </StackPanel>
+                    </TabItem.Header>
+                </TabItem>
+                <TabItem IsEnabled="True" IsVisible="False" x:Name="Wiki">
                     <TabItem.Header>
                         <StackPanel Orientation="Horizontal">
                             <LucideIcon Kind="LibraryBig" Width="32" Height="32" Size="32" />
@@ -532,6 +548,17 @@
                                 <!-- </Grid> -->
                             </StackPanel>
                         </TabItem>
+                        <TabItem>
+                            <TabItem.Header>
+                                <StackPanel Orientation="Horizontal">
+                                    <LucideIcon Kind="Puzzle" Width="16" Height="16" Size="16" />
+                                    <Label FontSize="16" Content="Module" VerticalContentAlignment="Center" />
+                                </StackPanel>
+                            </TabItem.Header>
+                            <StackPanel Orientation="Vertical" Spacing="10" x:Name="StpSettingsModules">
+
+                            </StackPanel>
+                        </TabItem>
                         <TabItem>
                             <TabItem.Header>
                                 <StackPanel Orientation="Horizontal">

MainWindow.axaml.cs

@@ -85,8 +85,92 @@ public partial class MainWindow : Window
         {
             Logger.Log($"Error while doing wiki stuff: {ex.Message}", Logger.LogType.Error);
         }
+
+        try
+        {
+            foreach(var module in Enum.GetValues<LCModule>())
+            {
+                CheckBox b = new CheckBox
+                {
+                    IsChecked = false
+                };
+                b.Click += (object sender, RoutedEventArgs e) => {
+                    RenewModuleSettings(module, b.IsChecked);
+                };
+
+                foreach(var conf in Settings._instance.moduleConfig.EnabledModules)
+                {
+                    if(conf.Item1 == module)
+                    {
+                        b.IsChecked = true;
+                    }
+                }
+                
+                Label l = new Label()
+                {
+                    Content = module.ToString(),
+                }; 
+                StpSettingsModules.Children.Add(new StackPanel()
+                {
+                    Orientation = Avalonia.Layout.Orientation.Horizontal,
+                    Children = {b,l}
+                });
+            }
+
+            foreach(var conf in Settings._instance.moduleConfig.EnabledModules)
+            {
+                Logger.Log($"Enabling module: {conf.Item1}");
+                switch (conf.Item1)
+                {
+                    case LCModule.Addressmanagement:
+                        Addressmanagement.IsVisible = true;
+                        break;
+                    case LCModule.Pricemanagement:
+                        Pricemanagement.IsVisible = true;
+                        break;
+                    case LCModule.Staffmanagement:
+                        Staffmanagement.IsVisible = true;
+                        break;
+                    case LCModule.Financemanagement:
+                        Financemanagement.IsVisible = true;
+                        break;
+                    case LCModule.Wiki:
+                        Wiki.IsVisible = true;
+                        break;
+                    case LCModule.UnifiedEndpointManagement:
+                        UnifiedEndpointManagement.IsVisible = true;
+                        break;
+                    default:
+                        break;
+                }
+            }
+            
+        } catch (Exception ex)
+        {
+            Logger.Log($"Error while applying module configuration: {ex.Message}");
+        }
     }
 
+    private void RenewModuleSettings(LCModule value, bool? enabled = true)
+    {
+        if (enabled == true)
+        {
+            Settings._instance.moduleConfig.EnabledModules.Add((value,false));
+        } else
+        {
+            int index = -1;
+            foreach(var conf in Settings._instance.moduleConfig.EnabledModules)
+            {
+                if(conf.Item1 == value)
+                {
+                    index = Settings._instance.moduleConfig.EnabledModules.IndexOf(conf);
+                }
+            }
+            if(index != -1)
+                Settings._instance.moduleConfig.EnabledModules.RemoveAt(index);
+        }
+        Settings.Save();
+    }
     private async void StartAddressCheck(int addresSetID)
     {
         var progressWindow = new ProgressWindow();
@@ -1377,4 +1461,14 @@ public partial class MainWindow : Window
             BtnCombineAddressSetSortUp.IsEnabled = true;
         }
     }
+
+    private void MnIAdSetView_OnClick(object? sender, RoutedEventArgs e)
+    {
+        if (LstCustomerAdressSets.SelectedItems.Count > 0)
+        {
+            var preview = new PreviewWindow((LstCustomerAdressSets.SelectedItems[0] as KasAddressList).KasPersons);
+            preview.Show();
+           
+        } 
+    }
 }

PreviewWindow.axaml

@@ -0,0 +1,289 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450" Icon="assets/icon.ico"
+        xmlns:local="using:Logof_Client" Closing="Window_OnClosing"
+        x:Class="Logof_Client.PreviewWindow"
+        Title="Datensätze bearbeiten" x:DataType="local:PreviewWindow">
+    <Grid ColumnDefinitions="*,400"
+          Margin="10">
+
+        <!-- Adressliste -->
+        <ListBox Grid.Column="0"
+                 x:Name="AddressList"
+                 ItemsSource="{Binding Addresses}"
+                 SelectedItem="{Binding SelectedAddress}"
+                 SelectionMode="Single">
+
+            <ListBox.ItemsPanel>
+                <ItemsPanelTemplate>
+                    <VirtualizingStackPanel />
+                </ItemsPanelTemplate>
+            </ListBox.ItemsPanel>
+
+            <ListBox.ItemTemplate>
+                <DataTemplate>
+
+                    <Grid ColumnDefinitions="70,150,180,250,80,180,150"
+                          Height="32">
+
+                        <TextBlock Grid.Column="0"
+                                   Text="{Binding id}"
+                                   VerticalAlignment="Center"/>
+
+                        <TextBlock Grid.Column="1"
+                                   Text="{Binding vorname}"
+                                   VerticalAlignment="Center"/>
+
+                        <TextBlock Grid.Column="2"
+                                   Text="{Binding name}"
+                                   VerticalAlignment="Center"/>
+
+                        <TextBlock Grid.Column="3"
+                                   Text="{Binding strasse}"
+                                   VerticalAlignment="Center"/>
+
+                        <TextBlock Grid.Column="4"
+                                   Text="{Binding plz}"
+                                   VerticalAlignment="Center"/>
+
+                        <TextBlock Grid.Column="5"
+                                   Text="{Binding ort}"
+                                   VerticalAlignment="Center"/>
+
+                        <TextBlock Grid.Column="6"
+                                   Text="{Binding land}"
+                                   VerticalAlignment="Center"/>
+
+                    </Grid>
+
+                </DataTemplate>
+            </ListBox.ItemTemplate>
+
+        </ListBox>
+
+
+        <!-- Editor -->
+        <ScrollViewer Grid.Column="1"
+                      Margin="15,0,0,0">
+
+            <StackPanel Spacing="6">
+
+                <TextBlock Text="Adresse bearbeiten"
+                           FontSize="20"
+                           FontWeight="Bold"
+                           Margin="0,0,0,10"/>
+
+
+                <Grid ColumnDefinitions="120,*"
+                      RowDefinitions="Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto" RowSpacing="4">
+
+                    <TextBlock Grid.Row="0"
+                               Text="ID"
+                               VerticalAlignment="Center"/>
+                    <TextBox Grid.Row="0"
+                             Grid.Column="1"
+                             Text="{Binding SelectedAddress.id}"
+                             IsReadOnly="True" IsEnabled="False"/>
+
+
+                    <TextBlock Grid.Row="1"
+                               Text="RefSID"
+                               VerticalAlignment="Center"/>
+                    <TextBox Grid.Row="1"
+                             Grid.Column="1"
+                             Text="{Binding SelectedAddress.refsid}"/>
+
+
+                    <TextBlock Grid.Row="2"
+                               Text="Anrede"
+                               VerticalAlignment="Center"/>
+                    <TextBox Grid.Row="2"
+                             Grid.Column="1"
+                             Text="{Binding SelectedAddress.anrede}"/>
+
+
+                    <TextBlock Grid.Row="3"
+                               Text="Titel"
+                               VerticalAlignment="Center"/>
+                    <TextBox Grid.Row="3"
+                             Grid.Column="1"
+                             Text="{Binding SelectedAddress.titel}"/>
+
+
+                    <TextBlock Grid.Row="4"
+                               Text="Vorname"
+                               VerticalAlignment="Center"/>
+                    <TextBox Grid.Row="4"
+                             Grid.Column="1"
+                             Text="{Binding SelectedAddress.vorname}"/>
+
+
+                    <TextBlock Grid.Row="5"
+                               Text="Adel"
+                               VerticalAlignment="Center"/>
+                    <TextBox Grid.Row="5"
+                             Grid.Column="1"
+                             Text="{Binding SelectedAddress.adel}"/>
+
+
+                    <TextBlock Grid.Row="6"
+                               Text="Name"
+                               VerticalAlignment="Center"/>
+                    <TextBox Grid.Row="6"
+                             Grid.Column="1"
+                             Text="{Binding SelectedAddress.name}"/>
+
+
+                    <TextBlock Grid.Row="7"
+                               Text="Namenszusatz"
+                               VerticalAlignment="Center"/>
+                    <TextBox Grid.Row="7"
+                             Grid.Column="1"
+                             Text="{Binding SelectedAddress.namezus}"/>
+
+
+                    <TextBlock Grid.Row="8"
+                               Text="Anredzusatz"
+                               VerticalAlignment="Center"/>
+                    <TextBox Grid.Row="8"
+                             Grid.Column="1"
+                             Text="{Binding SelectedAddress.anredzus}"/>
+
+
+                    <TextBlock Grid.Row="9"
+                               Text="Straße"
+                               VerticalAlignment="Center"/>
+                    <TextBox Grid.Row="9"
+                             Grid.Column="1"
+                             Text="{Binding SelectedAddress.strasse}"/>
+
+
+                    <TextBlock Grid.Row="10"
+                               Text="Straße 2"
+                               VerticalAlignment="Center"/>
+                    <TextBox Grid.Row="10"
+                             Grid.Column="1"
+                             Text="{Binding SelectedAddress.strasse2}"/>
+
+
+                    <TextBlock Grid.Row="11"
+                               Text="PLZ"
+                               VerticalAlignment="Center"/>
+                    <TextBox Grid.Row="11"
+                             Grid.Column="1"
+                             Text="{Binding SelectedAddress.plz}"/>
+
+
+                    <TextBlock Grid.Row="12"
+                               Text="Ort"
+                               VerticalAlignment="Center"/>
+                    <TextBox Grid.Row="12"
+                             Grid.Column="1"
+                             Text="{Binding SelectedAddress.ort}"/>
+
+
+                    <TextBlock Grid.Row="13"
+                               Text="Land"
+                               VerticalAlignment="Center"/>
+                    <TextBox Grid.Row="13"
+                             Grid.Column="1"
+                             Text="{Binding SelectedAddress.land}"/>
+
+
+                    <TextBlock Grid.Row="14"
+                               Text="PPLZ"
+                               VerticalAlignment="Center"/>
+                    <TextBox Grid.Row="14"
+                             Grid.Column="1"
+                             Text="{Binding SelectedAddress.pplz}"/>
+
+
+                    <TextBlock Grid.Row="15"
+                               Text="Postfach"
+                               VerticalAlignment="Center"/>
+                    <TextBox Grid.Row="15"
+                             Grid.Column="1"
+                             Text="{Binding SelectedAddress.postfach}"/>
+
+
+                    <TextBlock Grid.Row="16"
+                               Text="Name 1"
+                               VerticalAlignment="Center"/>
+                    <TextBox Grid.Row="16"
+                             Grid.Column="1"
+                             Text="{Binding SelectedAddress.name1}"/>
+
+
+                    <TextBlock Grid.Row="17"
+                               Text="Name 2"
+                               VerticalAlignment="Center"/>
+                    <TextBox Grid.Row="17"
+                             Grid.Column="1"
+                             Text="{Binding SelectedAddress.name2}"/>
+
+
+                    <TextBlock Grid.Row="18"
+                               Text="Name 3"
+                               VerticalAlignment="Center"/>
+                    <TextBox Grid.Row="18"
+                             Grid.Column="1"
+                             Text="{Binding SelectedAddress.name3}"/>
+
+
+                    <TextBlock Grid.Row="19"
+                               Text="Name 4"
+                               VerticalAlignment="Center"/>
+                    <TextBox Grid.Row="19"
+                             Grid.Column="1"
+                             Text="{Binding SelectedAddress.name4}"/>
+
+
+                    <TextBlock Grid.Row="20"
+                               Text="Name 5"
+                               VerticalAlignment="Center"/>
+                    <TextBox Grid.Row="20"
+                             Grid.Column="1"
+                             Text="{Binding SelectedAddress.name5}"/>
+
+
+                    <TextBlock Grid.Row="21"
+                               Text="Funktion"
+                               VerticalAlignment="Center"/>
+                    <TextBox Grid.Row="21"
+                             Grid.Column="1"
+                             Text="{Binding SelectedAddress.funktion}"/>
+
+
+                    <TextBlock Grid.Row="22"
+                               Text="Funktion 2"
+                               VerticalAlignment="Center"/>
+                    <TextBox Grid.Row="22"
+                             Grid.Column="1"
+                             Text="{Binding SelectedAddress.funktion2}"/>
+
+
+                    <TextBlock Grid.Row="23"
+                               Text="Abteilung"
+                               VerticalAlignment="Center"/>
+                    <TextBox Grid.Row="23"
+                             Grid.Column="1"
+                             Text="{Binding SelectedAddress.abteilung}"/>
+
+
+                    <TextBlock Grid.Row="24"
+                               Text="Funktion AD"
+                               VerticalAlignment="Center"/>
+                    <TextBox Grid.Row="24"
+                             Grid.Column="1"
+                             Text="{Binding SelectedAddress.funktionad}"/>
+
+                </Grid>
+
+            </StackPanel>
+
+        </ScrollViewer>
+
+    </Grid>
+</Window>

PreviewWindow.axaml.cs

@@ -0,0 +1,52 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.ComponentModel;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using Avalonia.Layout;
+using Avalonia.Media;
+
+namespace Logof_Client;
+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+
+public partial class PreviewWindow : Window, INotifyPropertyChanged
+{
+    public ObservableCollection<KasPerson> Addresses { get; }
+
+    private KasPerson? _selectedAddress;
+
+    public KasPerson? SelectedAddress
+    {
+        get => _selectedAddress;
+        set
+        {
+            _selectedAddress = value;
+            PropertyChanged?.Invoke(
+                this,
+                new PropertyChangedEventArgs(nameof(SelectedAddress)));
+        }
+    }
+
+    public event PropertyChangedEventHandler? PropertyChanged;
+
+    public PreviewWindow(IEnumerable<KasPerson> addresses)
+    {
+        InitializeComponent();
+
+        Addresses = new ObservableCollection<KasPerson>(addresses);
+
+        DataContext = this;
+    }
+
+    private void Window_OnClosing(object? sender, WindowClosingEventArgs e)
+    {
+        Settings.Save();
+        Global.Save();
+    }
+}
+

ResultWindow.axaml

@@ -45,7 +45,7 @@
             <!--     </DataGrid.Columns> -->
             <!-- -->
             <!-- </DataGrid> -->
-            <ListBox ItemsSource="{Binding Results}" SelectedItems="{Binding SelectedResults}">
+            <ListBox ItemsSource="{Binding Results}" SelectionMode="Multiple" x:Name="LbResults" SelectedItems="{Binding SelectedResults}">
                 <ListBox.ItemsPanel>
                     <ItemsPanelTemplate>
                         <VirtualizingStackPanel />

ResultWindow.axaml.cs

@@ -230,7 +230,20 @@ public partial class ResultWindow : Window, INotifyPropertyChanged
 
     private void BtnShowSelected_OnClick(object? sender, RoutedEventArgs e)
     {
-        // once upon a time, there was a feature like this
+        if (LbResults.SelectedItems.Count > 0)
+        {
+            var selectedPersons = LbResults.SelectedItems
+                .Cast<ResultItem>()
+                .Select(x => x.Person)
+                .ToList();
+
+            if (selectedPersons.Count == 0)
+                return;
+
+            var preview = new PreviewWindow(selectedPersons);
+            preview.Show();
+           
+        } 
     }
 
     private void BtnExecuteFilter_OnClick(object? sender, RoutedEventArgs e)