Add `MyProjectNameDbContextFactory` to `nolayers` project.

templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Blazor.Server/Data/MyProjectNameDbContextFactory.cs

@@ -0,0 +1,31 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Design;
+
+namespace MyCompanyName.MyProjectName.Data;
+
+public class MyProjectNameDbContextFactory : IDesignTimeDbContextFactory<MyProjectNameDbContext>
+{
+    public MyProjectNameDbContext CreateDbContext(string[] args)
+    {
+//<TEMPLATE-REMOVE IF-NOT='dbms:PostgreSQL'>
+        // https://www.npgsql.org/efcore/release-notes/6.0.html#opting-out-of-the-new-timestamp-mapping-logic
+        AppContext.SetSwitch("Npgsql.EnableLegacyTimestampBehavior", true);
+//</TEMPLATE-REMOVE>
+
+        var configuration = BuildConfiguration();
+
+        var builder = new DbContextOptionsBuilder<MyProjectNameDbContext>()
+            .UseSqlServer(configuration.GetConnectionString("Default"));
+
+        return new MyProjectNameDbContext(builder.Options);
+    }
+
+    private static IConfigurationRoot BuildConfiguration()
+    {
+        var builder = new ConfigurationBuilder()
+            .SetBasePath(Directory.GetCurrentDirectory())
+            .AddJsonFile("appsettings.json", optional: false);
+
+        return builder.Build();
+    }
+}

templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Host/Data/MyProjectNameDbContextFactory.cs

@@ -0,0 +1,31 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Design;
+
+namespace MyCompanyName.MyProjectName.Data;
+
+public class MyProjectNameDbContextFactory : IDesignTimeDbContextFactory<MyProjectNameDbContext>
+{
+    public MyProjectNameDbContext CreateDbContext(string[] args)
+    {
+//<TEMPLATE-REMOVE IF-NOT='dbms:PostgreSQL'>
+        // https://www.npgsql.org/efcore/release-notes/6.0.html#opting-out-of-the-new-timestamp-mapping-logic
+        AppContext.SetSwitch("Npgsql.EnableLegacyTimestampBehavior", true);
+//</TEMPLATE-REMOVE>
+
+        var configuration = BuildConfiguration();
+
+        var builder = new DbContextOptionsBuilder<MyProjectNameDbContext>()
+            .UseSqlServer(configuration.GetConnectionString("Default"));
+
+        return new MyProjectNameDbContext(builder.Options);
+    }
+
+    private static IConfigurationRoot BuildConfiguration()
+    {
+        var builder = new ConfigurationBuilder()
+            .SetBasePath(Directory.GetCurrentDirectory())
+            .AddJsonFile("appsettings.json", optional: false);
+
+        return builder.Build();
+    }
+}

templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Mvc/Data/MyProjectNameDbContextFactory.cs

@@ -0,0 +1,31 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Design;
+
+namespace MyCompanyName.MyProjectName.Data;
+
+public class MyProjectNameDbContextFactory : IDesignTimeDbContextFactory<MyProjectNameDbContext>
+{
+    public MyProjectNameDbContext CreateDbContext(string[] args)
+    {
+//<TEMPLATE-REMOVE IF-NOT='dbms:PostgreSQL'>
+        // https://www.npgsql.org/efcore/release-notes/6.0.html#opting-out-of-the-new-timestamp-mapping-logic
+        AppContext.SetSwitch("Npgsql.EnableLegacyTimestampBehavior", true);
+//</TEMPLATE-REMOVE>
+
+        var configuration = BuildConfiguration();
+
+        var builder = new DbContextOptionsBuilder<MyProjectNameDbContext>()
+            .UseSqlServer(configuration.GetConnectionString("Default"));
+
+        return new MyProjectNameDbContext(builder.Options);
+    }
+
+    private static IConfigurationRoot BuildConfiguration()
+    {
+        var builder = new ConfigurationBuilder()
+            .SetBasePath(Directory.GetCurrentDirectory())
+            .AddJsonFile("appsettings.json", optional: false);
+
+        return builder.Build();
+    }
+}