Asp Net Core Entity Framework Code First Example Tutorial

Hello, developers! Today, we're diving into the world of ASP .NET Core and Entity Framework Core, focusing on the Code First approach. If you're new to these technologies or looking to expand your knowledge, you've come to the right place.

ASP .NET Core is a powerful, high-performance, open-source framework for building modern, cloud-based, Internet-connected applications. Entity Framework Core, on the other hand, is a lightweight, extensible, and cross-platform version of the popular Entity Framework data access technology. When combined, they form a robust stack for building data-driven web applications.

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Setting Up ASP.NET Core with Entity Framework Core

Before we delve into Code First, let's set up an ASP.NET Core project with Entity Framework Core.

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First, create a new ASP.NET Core Web Application project using the command line or your favorite IDE. Then, add the Microsoft.EntityFrameworkCore and Microsoft.EntityFrameworkCore.SqlServer packages to your project. These packages will enable Entity Framework Core and allow us to use SQL Server as our database.

Creating the Model Class

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In Code First, we start by defining our model using plain old CLR objects (POCOs). Let's create a simple Blog model:

public class Blog
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Url { get; set; }
}

Creating the DbContext Class

Next, we'll create a DbContext class that will manage our database interactions:

public class ApplicationDbContext : DbContext
{
    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
        : base(options)
    {
    }

    public DbSet<Blog> Blogs { get; set; }
}

Database Migration with Code First

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Now that we have our model and DbContext, let's see how Code First handles the database.

By default, Code First uses a migration tool called ef migrations. This tool takes our current model and applies any differences to the database, ensuring it matches our code.

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Applying Migrations

To apply migrations, run the following commands in the Package Manager Console:

Add-Migration InitialCreate
Update-Database

These commands create a new migration and apply it to the database, creating the necessary schema to store our Blog model.

Adding Data to the Database

With our database set up, let's insert some data:

var blog = new Blog { Name = "ASP.NET Blog", Url = "http://asp.net" };
context.Blogs.Add(blog);
context.SaveChanges();

The DbSet.Add method inserts the new entity into the database, and DbContext.SaveChanges saves the changes to the database.

And that's a wrap! You've just seen how ASP.NET Core and Entity Framework Core work together using the Code First approach. Now, go forth and build amazing data-driven web applications!