What is meant by DBContext???

Prior to EntityFramework 4.1, EDM used to generate context classes that were derived from the ObjectContext class. It was a little tricky to work with ObjectContext. DbContext is conceptually similar to ObjectContext. It is a wrapper around ObjectContext which is useful in all the development models: Code First, Model First and Database First.

DbContext is an important part of Entity Framework. It is a bridge between your domain or entity classes and the database.

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DbContext is the primary class that is responsible for interacting with data as object. DbContext is responsible for the following activities:

  • EntitySet: DbContext contains entity set (DbSet<TEntity>) for all the entities which is mapped to DB tables.
  • Querying: DbContext converts LINQ-to-Entities queries to SQL query and send it to the database.
  • Change Tracking: It keeps track of changes that occurred in the entities after it has been querying from the database.
  • Persisting Data: It also performs the Insert, Update and Delete operations to the database, based on what the entity states.
  • Caching: DbContext does first level caching by default. It stores the entities which have been retrieved during the life time of a context class.
  • Manage Relationship: DbContext also manages relationship using CSDL, MSL and SSDL in DB-First or Model-First approach or using fluent API in Code-First approach.

Object Materialization: DbContext converts raw table data into entity objects.

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