Entity Framework 6 Refresher: Initial Setup

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It has been a long time since I used Entity Framework on anything other than an brownfield project where most work consisted of adding or removing the occasional field. This series of posts is intented as a refresher as I relearn some concepts.

  1. Initial Setup
  2. Seed Data
  3. Mapping Files
  4. One-to-many mapping
  5. Many-to-many mapping
  6. Many-to-many self mapping
  7. One-to-one mapping

Initial setup.

In a new .Net Framwork class library, add a reference to Microsoft.EntityFramework via the NuGet package manager.

Next add a basic class

public class Person
    public int PersonId { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }

Then add a DbContext.

public class LearnMappingsContext : DbContext
    public DbSet<Person> People { get; set; }

Next add a connection string to the app.config file that was created when you added the NuGet package.

<?xml version="1.0" encoding="utf-8"?>
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
    <add name="LearnMappings" connectionString="Server=.\SQLEXPRESS;Database=LearnMappings;Trusted_Connection=True;" providerName="System.Data.EntityClient" />
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />

We are now ready to set up migrations. The first step is to enable them. In the Package Manager Console (PMC from now on - this can be found under Tools | NuGet Package Manager | Package Manager Console) run the command to add migrations:


This will create a /Migrations folder with a file called configurations.cs.

Next, create the migration for the person class (this does not need to be named “InitialMigration”)

add-migration "InitialMigration"

This will generate a migration script to add the Person class.

Finally, run update-database in the PMC to create the table in your database.

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