A summary of the steps for setting up a database using Entity Framework Core via Code First

This is a summary of the steps in previous post.

  • Create a Blazor Service app with Identity through local data
    • This is to get an ApplicationDbContext. You could get DbContext without this though.
  • Setup the database connectivity through a connection string in appsettings.json. Default is an .mdf file.
  • Create the database using update-database
  • Create a class for each entity with an Id and other properties and each with suitable annotations.
  • Class instances can be properties of another class.
    • No need for the referenced class Id in the consuming class. Nb: EF uses the Id in database though.
  • Each Entity needs a DbContext.
  • Run add-migration
    Then update-database
  • Repeat the previous 2 steps every time you add, delete or modify the entity classes.
  • Create a Service class to access the database with or without an interface.
    • This implements database CRUD through the DbContext.
  • If using an interface add, for example, the following to startup.cs in ConfigureServices()
    services.AddTransient<IHelperService, HelperService>();
    • If not add, for example: services.AddTransient<HelperService>();
  • The Add method can be AddScoped, AddTransient or AddSingleton .. more on that in a subsequent post.
  • In a razor page inject an instance of the service using: @inject IHelperService service if using an interface with the service OR
    @inject HelperService service if not using an interface!
  • Then in the page’s codebehind use service.<CRUD methods in the service>()

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