.NET Core Generic Host w/ Entity Framework Migrations - FULL STACK WPF (.NET CORE) MVVM #22 

Thanks for the tip. Also you can set project as a startup in solution explorer.

Good question MsQlan! I received a similar question the other day, so I might take a closer look into saving settings into appsettings.json. However, I usually just setup a seperate class, serialize my settings to a JSON string, and then write the JSON string to a custom JSON file. Here's an example on lines 41-42 (ignore the other ugly stuff in this file hahaha) 😀: github.com/SingletonSean/design-patterns-csharp/blob/4fd30f951d53fe0677c0b880e36b56d0172bee7d/AbstractFactory/Services/ProductWriters/FileProductWriter.cs#L41

I had the same problem, to fix it: 1. Change Startup Project to: "SimpleTrade.WPF". 2. In Package Manager Console set "Default project" to "SimpleTrader.EntityFramework" Shoud works!

​@@krzysztofwozniczak4747 You are my hero! I guess after seeing him have to change the startup project to entity core in the previous videos I just assumed that was always the way to do it. In hindsight that makes perfect sense as the thing the migration is looking for is not in that project anymore. Thank you so much for taking the time to make this comment!!!

This is my Create Host Builder method: public static IHostBuilder CreateHostBuilder(string[] args = null) { return Host.CreateDefaultBuilder(args) .ConfigureAppConfiguration(c => { c.AddJsonFile("appsettings.json"); }) .ConfigureServices((context, services) => { string connectionString = context.Configuration.GetConnectionString("default"); services.AddDbContext(o => o.UseSqlServer(connectionString)); services.AddSingleton( new SimpleTraderDbContextFactory(connectionString)); services.AddSingleton(); services.AddSingleton(); services.AddSingleton(); services.AddSingleton(); services.AddSingleton(); services.AddSingleton(); services.AddSingleton(); services.AddSingleton(); services.AddSingleton(); services.AddSingleton(); services.AddSingleton(); services.AddScoped(); services.AddSingleton(); services.AddSingleton(); services.AddSingleton(services => new HomeViewModel(MajorIndexListingViewModel .LoadMajorIndexViewModel( services.GetRequiredService()), services.GetRequiredService())); services.AddSingleton(services => { return () => services.GetRequiredService(); }); services.AddSingleton(services => { return () => services.GetRequiredService(); }); services.AddSingleton(services => { return () => services.GetRequiredService(); }); services.AddSingleton(services => { return () => new LoginViewModel( services.GetRequiredService(), new Renavigator( services.GetRequiredService(), services.GetRequiredService())); }); services.AddSingleton(); services.AddSingleton(); services.AddSingleton(); services.AddScoped(); services.AddScoped(s => new MainWindow(s.GetRequiredService())); }); }

Hey Brandon, this is because the DbContextFactory takes a string in the constructor, and of course "string" is not registered in the DI container. I forget which video I fix this in, but the issue should be resolved in source control. Let me know if you run into any issues!

@@SingletonSean Thanks for the response! Can you clarify what you mean by the issue being resolved in source control?

Hey Brandon, I was suggesting viewing the source code at github.com/SingletonSean/SimpleTrader. However, I see that you are registering the SimpleTraderDbContextFactory twice! The second registration (between IAccountService and IBuyStockService) should be removed.

@@SingletonSean That solved the problem!! Sometimes it's those small things you miss that others can see right away lol...thanks man!

Many more videos Vinay! Maybe 30? Not sure exactly, as many as it takes to have a solid application that goes through the entire lifecycle of an application, haha.

@@SingletonSean awesome. Lot of learning opportunity. Thank you Sean 🙏