What is HasKey C#?

HasKey(IEnumerable) Configures the primary key property(s) for this entity type. C# Copy. public System.Data.Entity.ModelConfiguration.Configuration.

How do I create a composite key in EF core?

Composite keys are not covered by conventions or data annotation attributes. The only way to configure composite keys is to use the HasKey method. You specify the properties that form the composite key by passing them in as properties of an anonymous type to the HasKey method.

What is principal key?

Principal key: The properties that uniquely identify the principal entity. This may be the primary key or an alternate key. Foreign key: The properties in the dependent entity that are used to store the principal key values for the related entity.

What is the hash key for?

A hash key is a small value that is used to represent a large piece of data in a hash system. In addition, hash key is the international English term for the # key on a telephone or keyboard. A hash key is a small value that is used to represent a large piece of data in a hash system.

What is Composite key give an example?

In a table representing students our primary key would now be firstName + lastName. Because students can have the same firstNames or the same lastNames these attributes are not simple keys. The primary key firstName + lastName for students is a composite key.

What is fluent API C#?

Fluent API is an advanced way of specifying model configuration that covers everything that data annotations can do in addition to some more advanced configuration not possible with data annotations.

What do principals keys do?

The Keys can be used to get out of detention early, with a one-time use. However, if Principal of the Thing sees the player in any location (except for the playground) while the detention timer is still ticking, he will send them back to his office with increased detention time, making the use of this item very risky.

When should I use Fluent API?

Entity Framework Fluent API is used to configure domain classes to override conventions. EF Fluent API is based on a Fluent API design pattern (a.k.a Fluent Interface) where the result is formulated by method chaining.

How do I find the hash key?

The # key, commonly known as hashtag key, or pound, sharp or number key, on your keyboard is widely used today on social media, especially Twitter. Ideally, # symbol or key is activated by pressing Shift+3, but can also be found from the symbols in Word program on Office.