Entity Framework Core provides a range of options for configuring types (entities) using the Fluent API. These options are available as methods that can be chained to the ModelBuilder.Entity() method, which is available in generic and non-generic versions. The non-generic methods take the name or type of the entity to be configured:
language-csharp
|
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity(typeof(EntityName))...
}
or
language-csharp
|
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity("EntityName")...
}
Most often, you will use the generic version to specify the type that the configuration applies to. This option is the one that is used throughout this guide:
language-csharp
|
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<EntityName>()...
}
Methods available for type configuration are detailed below.
| HasAlternateKey | Generates a unique constraint for the specified property or properties |
| HasAnnotation | Provides a means to apply annotations via the Fluent API |
| HasBaseType | Specifies the base type of the entity |
| HasIndex | Generates an index on the specified property or properties |
| HasKey | Denotes the specified property as the entity key |
| HasMany | Specifies the Many end of a relationship |
| HasOne | Specifies the One end of a relationship |
| Ignore |Denotes that the entity should be omitted from mapping | |
| ToTable | Specifies the database table that the entity should be mapped to |
| Property | Provides access to property configuration |
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