Visual Basic 2015 Unleashed

Introducing the Fluent APIs

There is an interesting alternative for customizing the model mapping in code, based on the Fluent APIs. As the name implies, this technique enables customizations only writing fluent code, without additional attributes or external mapping files. To use the Fluent APIs, you need to override the OnModelCreating method in the context class and, inside the method body, apply edits via lambda expressions. The following code demonstrates how to rewrite the BookStore and Book classes using fluent code:

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Public Class BookStore    Inherits DbContext    Public Property Books As DbSet(Of Book)    Public Property Authors As DbSet(Of Author)    Protected Overrides Sub OnModelCreating(modelBuilder As ...