What Is DbContext And DbSet In Entity Framework?

What is the basic job of a DbSet?

DbSet in Entity Framework 6.

The DbSet class represents an entity set that can be used for create, read, update, and delete operations.

The context class (derived from DbContext ) must include the DbSet type properties for the entities which map to database tables and views..

What is scaffolding in Entity Framework?

ASP.NET Scaffolding is a code generation framework for ASP.NET Web applications. … You add scaffolding to your project when you want to quickly add code that interacts with data models. Using scaffolding can reduce the amount of time to develop standard data operations in your project.

What is meant by Entity Framework?

Entity Framework is an Object Relational Mapper (ORM) which is a type of tool that simplifies mapping between objects in your software to the tables and columns of a relational database. Entity Framework (EF) is an open source ORM framework for ADO.NET which is a part of . NET Framework.

What is OnModelCreating in Entity Framework?

The DbContext class has a method called OnModelCreating that takes an instance of ModelBuilder as a parameter. This method is called by the framework when your context is first created to build the model and its mappings in memory.

Is it good to use Entity Framework?

Entity Framework is the best way to develop database applications. I used to develop my applications using LINQ to SQL but since Microsoft is not going to support it in future, it recommends to use Entity Framework. By the way, Entity Framework 4 in . NET 4 has much better performance than previous versions.

What is difference between ADO net and Entity Framework?

It is an enhancement to ADO.NET that gives developers an automated mechanism for accessing & storing the data in the database. Entity framework is ORM Model, which used LINQ to access database, and code is autogenerated whereas Ado.net code is larger than Entity Framework. Ado.net is faster than Entity Framework.

What is C# Entity Framework?

Entity Framework is an open-source ORM framework for . NET applications supported by Microsoft. It enables developers to work with data using objects of domain specific classes without focusing on the underlying database tables and columns where this data is stored.

What is scaffold DbContext?

Reverse engineering is the process of scaffolding entity type classes and a DbContext class based on a database schema. It can be performed using the Scaffold-DbContext command of the EF Core Package Manager Console (PMC) tools or the dotnet ef dbcontext scaffold command of the . NET Command-line Interface (CLI) tools.

What does scaffolding mean?

Scaffolding is breaking up the learning into chunks and providing a tool, or structure, with each chunk. When scaffolding reading, for example, you might preview the text and discuss key vocabulary, or chunk the text and then read and discuss as you go.

How do I query in Entity Framework?

As the name suggests, LINQ-to-Entities queries operate on the entity set ( DbSet type properties) to access the data from the underlying database. You can use the LINQ method syntax or query syntax when querying with EDM. Visit LINQ Tutorials to learn LINQ step-by-step.

What is DbSet in Entity Framework?

Definition. Namespace: System.Data.Entity Assembly: EntityFramework.dll. A DbSet represents the collection of all entities in the context, or that can be queried from the database, of a given type. DbSet objects are created from a DbContext using the DbContext. Set method.

What is Entity Framework and how it works?

The Entity Framework is a set of technologies in ADO.NET that support the development of data-oriented software applications. … They must model the entities, relationships, and logic of the business problems they are solving, and they must also work with the data engines used to store and retrieve the data.

What does virtual mean in Entity Framework?

navigation propertiesIt allows the Entity Framework to create a proxy around the virtual property so that the property can support lazy loading and more efficient change tracking. … The Entity Framework requires your navigation properties to be marked as virtual so that lazy loading and efficient change tracking are supported.

What is DbContext in Entity Framework?

DbContext is an important class in Entity Framework API. It is a bridge between your domain or entity classes and the database. DbContext is the primary class that is responsible for interacting with the database.

Why is DbSet virtual?

While the virtual keyword on the derived DbContext class (virtual DbSet<>) is used for testing purpose (mocking the DbSet property), virtual keyword in this case is not related to lazy loading.

What are the disadvantages of Entity Framework?

Disadvantages of Entity FrameworkLazy loading is the main drawbacks of EF.Its syntax is complicated.Its logical schema is not able to understand business entities and relation among each other.Logical schema of database is not capable of using certain parts of application.It is not available for every RDMS.Need to handle data in nontraditional way.More items…•

What are the types of entity framework?

There are three approaches to model your entities in Entity Framework: Code First, Model First, and Database First. This article discusses all these three approaches and their pros and cons.

Why navigation properties are virtual?

1 Answer. If you define your navigation property virtual , Entity Framework will at runtime create a new class (dynamic proxy) derived from your class and uses it instead of your original class. … It enables Entity Framework to avoid loading an entire tree of dependent objects which are not needed from the database.