Fixed EF Tooling

- Added factory class for EF tooling
- Removed no longer needed Program.cs

I18N Commander/DataModel/Database/Common/DataContextFactory.cs

@@ -0,0 +1,28 @@
+using Microsoft.EntityFrameworkCore.Design;
+
+namespace DataModel.Database.Common;
+
+/// <summary>
+/// This factory is used by the EF tooling e.g. to create migrations.
+/// </summary>
+public sealed class DataContextFactory : IDesignTimeDbContextFactory<DataContext>
+{
+    private const string ENV_EF_TOOLING_DATABASE = "ENV_EF_TOOLING_DATABASE";
+    
+    #region Implementation of IDesignTimeDbContextFactory<out DataContext>
+
+    /// <inheritdoc />
+    public DataContext CreateDbContext(string[] args)
+    {
+        var dataFile = Environment.GetEnvironmentVariable(ENV_EF_TOOLING_DATABASE);
+        if (string.IsNullOrWhiteSpace(dataFile))
+        {
+            Console.WriteLine("In order to use EF tooling, point the environment variable ENV_EF_TOOLING_DATABASE to the data file, which should be used for the EF tooling.");
+            Environment.Exit(100);
+        }
+        
+        return Setup.CreateDatabaseInstance4Tooling(dataFile, false);
+    }
+
+    #endregion
+}

I18N Commander/DataModel/Database/TextElement.cs

@@ -16,7 +16,7 @@ public sealed class TextElement
 
     public bool IsMultiLine { get; set; } = false;
 
-    public Section Section { get; set; }
+    public Section Section { get; set; } = new();
 
     public List<Translation> Translations { get; set; } = new();
 

I18N Commander/DataModel/Program.cs

@@ -1,13 +0,0 @@
-using Microsoft.Extensions.Hosting;
-namespace DataModel;
-
-public static class Program
-{
-    public static void Main(string[] args)
-    {
-        Console.WriteLine("This app is intended for the EF tooling. You cannot start this data project, though.");
-        Environment.Exit(0);
-    }
-
-    public static IHostBuilder CreateHostBuilder(string[] args) => Setup.Setup4EFTooling(args);
-}

I18N Commander/DataModel/Setup.cs

@@ -9,7 +9,6 @@ namespace DataModel;
 
 public static class Setup
 {
-    private const string ENV_EF_TOOLING_DATABASE = "ENV_EF_TOOLING_DATABASE";
     private const string DB_READ_WRITE_MODE = "ReadWrite";
     private const string DB_READ_WRITE_CREATE_MODE = "ReadWriteCreate";
 
@@ -90,26 +89,26 @@ public static class Setup
     }
 
     /// <summary>
-    /// Sets up the DI & db context ready for the EF tooling.
+    /// Create the database instance from the given path. Used for the EF tooling.
     /// </summary>
-    public static IHostBuilder Setup4EFTooling(string[] args)
+    public static DataContext CreateDatabaseInstance4Tooling(string path2DataFile, bool createWhenNecessary = true)
     {
-        var dataFile = Environment.GetEnvironmentVariable(ENV_EF_TOOLING_DATABASE);
-        if (string.IsNullOrWhiteSpace(dataFile))
-        {
-            Console.WriteLine("In order to use EF tooling, point the environment variable ENV_EF_TOOLING_DATABASE to the data file, which should be used for the EF tooling.");
-            Environment.Exit(100);
-        }
+        // Store the path to the database:
+        Setup.USED_DATA_FILE = path2DataFile;
+        Setup.SETUP_MAINTENANCE = new(path2DataFile, false);
         
-        var builder = Host.CreateDefaultBuilder(args);
-        builder.ConfigureServices((hostContext, serviceCollection) =>
-        {
-            serviceCollection.AddDbContext<DataContext>(options => options.UseSqlite($"Filename={dataFile};Mode=ReadWriteCreate"));
-        });
-
-        return builder;
+        // Create a database builder:
+        var builder = new DbContextOptionsBuilder<DataContext>();
+        
+        // Add the database configuration to the builder:
+        builder.UseSqlite($"Filename={path2DataFile};Mode={(createWhenNecessary ? DB_READ_WRITE_CREATE_MODE : DB_READ_WRITE_MODE)};");
+        
+        // Next, construct the database context:
+        var dbContext = new DataContext(builder.Options);
+        return dbContext;
     }
 
+
     public readonly record struct SetupMaintenance(string PathToDataFile = "", bool RemoveTempDatabaseAfterwards = false) : IDisposable
     {
         public void Dispose()