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();