Where is dbcontext

For example, the context opens a connection to execute a query, and then closes the connection when all the result sets have been processed. There are cases when you want to have more control over when the connection opens and closes. For example, when working with SQL Server Compact, it is often recommended to maintain a separate open connection to the database for the lifetime of the application to improve performance. You can manage this process manually by using the Connection property.

Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services. Privacy policy. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Is this page helpful? More control over the model used for the Model First approach can be obtained by creating a DbCompiledModel explicitly from a DbModelBuilder and passing this model to one of the DbContext constructors.

The connection to the database including the name of the database can be specified in several ways. If the parameterless DbContext constructor is called from a derived context, then the name of the derived context is used to find a connection string in the app.

If no connection string is found, then the name is passed to the DefaultConnectionFactory registered on the Database class. The connection factory then uses the context name as the database name in a default connection string. This default connection string points to. Note that the connection found in the app. A DbModelBuilderVersionAttribute can be applied to a class derived from DbContext to set the version of conventions used by the context when it creates a model.

If no attribute is applied then the latest version of conventions will be used. Constructs a new context instance using conventions to create the name of the database to which a connection will be made. See the class remarks for how this is used to create a connection. Constructs a new context instance using conventions to create the name of the database to which a connection will be made, and initializes it from the given model.

Constructs a new context instance using the existing connection to connect to a database. The connection will not be disposed when the context is disposed if contextOwnsConnection is false. Constructs a new context instance using the existing connection to connect to a database, and initializes it from the given model. Constructs a new context instance using the given string as the name or connection string for the database to which a connection will be made.

Constructs a new context instance using the given string as the name or connection string for the database to which a connection will be made, and initializes it from the given model. Disposes the context.

The underlying ObjectContext is also disposed if it was created is by this context or ownership was passed to this context when this context was created. The connection to the database DbConnection object is also disposed if it was created is by this context or ownership was passed to this context when this context was created.

Update Attaches disconnected entity with Modified state and start tracking it. The data will be saved when SaveChagnes is called. UpdateRange Attaches a collection of disconnected entities with Modified state and start tracking it. OnConfiguring Override this method to configure the database and other options to be used for this context.

This method is called for each instance of the context that is created. Method Usage ChangeTracker Provides access to information and operations for entity instances this context is tracking.

Database Provides access to database related information and operations for this context. Model Returns the metadata about the shape of entities, the relationships between them, and how they map to the database. Entity Framework Courses on Pluralsight.

Adds a new entity to DbContext with Added state and starts tracking it. Asynchronous method for adding a new entity to DbContext with Added state and starts tracking it.

Adds a collection of new entities to DbContext with Added state and starts tracking it. Asynchronous method for adding a collection of new entities which will be saved on SaveChangesAsync.