1. 02 | Beginning Code First Adam Tuliper | Technical Evangelist
Christopher Harrison | Content Developer

2. Code First Simple Code First Creating classes Creating Data Context
Initializing the database

3. Simple Code First

4. public class Artist {
public int ArtistID { get; set; }
public string Name { get; set; }
public string Bio { get; set; } }

5. Code first classes…
are just classes

6. Code first class design tips
Just design your classes the way you typically would
(for the most part)
Use best practices
ID for the ID
You can still control the database
Attributes
Fluent API

7. Creating classes

8. But what about my database?
Code First often does the right thing
But it does need a little guidance
For example, strings become nvarchar(max)

9. Basic database control
Data annotations can be used to provide additional context
System.ComponentModel.DataAnnotations
us/library/system.componentmodel.dataannotations(v=vs.110).aspx
Not specific to Entity Framework
Used by several other platforms, including MVC

10. Code First conventions
Tables are automatically pluralized
Tables are created in the dbo schema
ID property is created as the primary key
Identity or auto-count column

11. Table creation
TableAttribute
Schema
Name
ColumnAttribute

12. Strings Nullable nvarchar(max) is the default Attributes
StringLengthAttribute
MaximumLength
MinimumLength
RequiredAttribute

13. Numbers SQL data type is mapped to .NET data type RangeAttribute
long becomes BigInt
RangeAttribute
Maximum
Minimum

14. Numbers and nullability
Numbers are value types in .NET
.NET property must be marked as nullable
Nullable<T>
type?

15. Attributes and database control

16. Creating the Data Context

17. Creating the Data Context
Just like creating a normal class
It's like it's called Code First 
public class MusicStoreDbContext : DbContext {
public DbSet<Artist> Artists { get; set; } }

18. Creating the DbContext

19. The Find() method
Regardless of the data type you're going to need to look the object up by its key
Rewriting that code over and over again becomes tedious
The Find method will do that for you
Accepts a parameter that maps to the key
Returns the object if it's found
Returns null if it isn't

20. Creating a repository

21. Initializing the database

22. Testing requires a known starting state
Entity Framework provides database initializers to create that state
Create a class that inherits from the appropriate option
CreateDatabaseIfNotExists
DropCreateDatabaseWhenModelChanges
DropCreateDatabaseAlways
Override the Seed method to create database content
Register the method with Database.SetInitializer

23. Initializing the database