question

Hi Vojislavekli-4660,
Here is an example that injecting the IBusinessLayer and ILogger object through Forms object, and you can refer to.
And Generic HostBuilder was introduced in .NET Core 2.1.
1.Create a Windows FormsApp(.NET Core).
2.Add ConfigureServices() method:
Please add below ConfigureServices() method. This method can be used for registering all the required services within Service collection.

 private static void ConfigureServices(ServiceCollection services)
 {
     services.AddLogging(configure => configure.AddConsole())
             .AddScoped<IBusinessLayer, CBusinessLayer>()
             .AddScoped<IBusinessLayer, CBusinessLayer>()
             .AddSingleton<IDataAccessLayer,CDataAccessLayer>();
 }

3.Add Form1 which is currently my master Form and has the UI logic. Please register Form1 to above as services.

   services.AddScoped<Form1>()

4.Adding DI Container:
Please update the Main() method as below.
We shall be injecting ILogger and IBusinessLayer object is as below.

 [STAThread]
 static void Main()
 {
     Application.SetHighDpiMode(HighDpiMode.SystemAware);
     Application.EnableVisualStyles();
     Application.SetCompatibleTextRenderingDefault(false);
     
     var services = new ServiceCollection();
     
     ConfigureServices(services);
     
     using (ServiceProvider serviceProvider = services.BuildServiceProvider())
     {
         var form1 = serviceProvider.GetRequiredService<Form1>();
         Application.Run(form1);
     }
 }

Here we are assuming Form1 is the master form that holds other forms together.
5.Add IBusinessObject and ILogger using DI to Forms App

 public partial class Form1 : Form
     {
         private readonly ILogger _logger;
     
         private readonly IBusinessLayer _business;
         public Form1(ILogger<Form1> logger, IBusinessLayer business)
         {
             _logger = logger;
             _business = business;
             InitializeComponent();
         }
     
         private void button1_Click(object sender, EventArgs e)
         {
             try
             {
                 _logger.LogInformation("Form1 {BusinessLayerEvent} at {dateTime}", "Started", DateTime.UtcNow);
     
                 // Perform Business Logic here 
                 _business.PerformBusiness();
     
                 MessageBox.Show("Hello .NET Core 3.0 . This is First Forms app in .NET Core");
     
                 _logger.LogInformation("Form1 {BusinessLayerEvent} at {dateTime}", "Ended", DateTime.UtcNow);
     
             }
             catch (Exception ex)
             {
                 //Log technical exception 
                 _logger.LogError(ex.Message);
                 //Return exception repsponse here
                 throw;
     
             }
     
         }
     }

Best Regards,
Daniel Zhang

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