DjsBlog: Blazor Helpers App -Entity Framework Summary

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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Blazor Helpers App: Entity Framework Summary