DI Setup using HostApplicationBuilder

DataAccess/EF_Demo/Demo.cs

@@ -1,29 +1,28 @@
-#if POSTGRES
+#if POSTGRES
 using EF_Demo.Data.Postgres;
 #else
 using EF_Demo.Data.MSSQL;
 #endif
 
 using EF_Demo.Models;
-using Microsoft.Extensions.DependencyInjection;
+using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Logging;
 
 namespace EF_Demo;
 
-internal class Demo
+internal class Demo(IDbContextFactory<EventsContext> contextFactory, ILogger<Demo> logger)
 {
-  internal static int? AddEvent(IServiceProvider serviceProvider, string eventName, DateOnly eventDate)
+  internal int? AddEvent(string eventName, DateOnly eventDate)
   {
-    ILogger logger = serviceProvider.GetRequiredService<ILogger<Demo>>();
     try
     {
-      using var ctx = serviceProvider.GetRequiredService<EventsContext>();
+      using var ctx = contextFactory.CreateDbContext();
       Event @event = new()
       {
         Name = eventName,
         EventDate = eventDate
       };
-      ctx.Add(@event);  //or ctx.Events.Add(@event) or ctx.Set<Event>().Add(@event);
+      ctx.Add(@event);
       ctx.SaveChanges();
       logger.LogInformation($"Event {eventName} successfully added with id {@event.Id}");
       return @event.Id;
@@ -35,16 +34,15 @@ internal class Demo
     }
   }
 
-  internal static void DeleteEvent(IServiceProvider serviceProvider, int eventId)
+  internal void DeleteEvent(int eventId)
   {
-    ILogger logger = serviceProvider.GetRequiredService<ILogger<Demo>>();
     try
     {
-      using var ctx = serviceProvider.GetRequiredService<EventsContext>();
+      using var ctx = contextFactory.CreateDbContext();
       Event? @event = ctx.Events.Find(eventId);
       if (@event != null)
       {
-        ctx.Remove(@event); //or ctx.Entry(product).State = EntityState.Deleted;
+        ctx.Remove(@event);
         ctx.SaveChanges();
         logger.LogInformation($"Event {@event.Name} deleted");
       }
@@ -59,12 +57,11 @@ internal class Demo
     }
   }
   
-  internal static void PostponeEvent(IServiceProvider serviceProvider, int eventId, int days)
+  internal void PostponeEvent(int eventId, int days)
   {
-    ILogger logger = serviceProvider.GetRequiredService<ILogger<Demo>>();
     try
     {
-      using var ctx = serviceProvider.GetRequiredService<EventsContext>();
+      using var ctx = contextFactory.CreateDbContext();
       Event? @event = ctx.Events.Find(eventId);
       if (@event != null)
       {
@@ -74,12 +71,12 @@ internal class Demo
       }
       else
       {
-        logger?.LogWarning($"Event #{eventId} does not exists");
+        logger.LogWarning($"Event #{eventId} does not exists");
       }
     }
     catch (Exception exc)
     {
-      logger?.LogError($"Error trying to change evenbt #{eventId}: {exc.CompleteExceptionMessage()}");
+      logger.LogError($"Error trying to change evenbt #{eventId}: {exc.CompleteExceptionMessage()}");
     }
   }
 
@@ -87,12 +84,12 @@ internal class Demo
   /// Print all people born in the provided year, ordered by country, and then by transliterated last name, and first name
   /// query is projected to an anonymous class
   /// </summary>
-  internal static void PrintPeople(IServiceProvider serviceProvider, int year)
+  internal void PrintPeople(int year)
   {
-    using var ctx = serviceProvider.GetRequiredService<EventsContext>();
+    using var ctx = contextFactory.CreateDbContext();
     var query = ctx.People
                    .Where(p => p.BirthDate.Year == year)
-                   .OrderBy(p => p.CountryCodeNavigation.Name)                  
+                   .OrderBy(p => p.CountryCodeNavigation.Name)
                    .ThenBy(p => p.LastNameTranscription)
                    .ThenBy(p => p.FirstNameTranscription)
                    .Select(p => new