EF Code First

DataAnnotations

• ComplexType
• Concurrencycheck
• TimeStamp
• databasegenerated
• ForeignKey
• Inverseproperty

Fluent API

• Enable Cascade Delete
• Configuration Both sides are a must relationship
• Whether the configuration string property supports Unicode content
• Configure properties to be used as optimistic and starter cards

Configuration:

• Database initialization Policy

Database creation is controlled by policy and has the following four strategies:

1. Createdatabaseifnotexists: This is the default policy. If the database does not exist, create a database. However, if the database exists and the entity has changed, an exception occurs.

2. Dropcreatedatabaseifmodelchanges: This strategy shows that if the model changes, the database is recreated and the original database is deleted.

3. Dropcreatedatabasealways: This policy indicates that the database will be recreated each time the program is run, which is useful when developing and debugging.

4. Custom database policy: You can implement your own idatabaseinitializer to create your own policies. or derive from an existing class that implements the Idatabaseinitializer interface.

Instance:

EF Code First