What is context class in EF?

The context class in Entity Framework is a class which derives from System. Data. The context class is used to query or save data to the database. It is also used to configure domain classes, database related mappings, change tracking settings, caching, transaction etc.

How do I find EF queries?

There are two ways: To view the SQL that will be generated, simply call ToTraceString() . You can add it into your watch window and set a breakpoint to see what the query would be at any given point for any LINQ query.

Does EF core use LINQ?

Entity Framework Core uses Language-Integrated Query (LINQ) to query data from the database. It uses your derived context and entity classes to reference database objects. EF Core passes a representation of the LINQ query to the database provider.

What is a DbContext C#?

A DbContext instance represents a combination of the Unit Of Work and Repository patterns such that it can be used to query from a database and group together changes that will then be written back to the store as a unit. DbContext is conceptually similar to ObjectContext.

What is context class in Java?

A Context represents your environment. It represents the state surrounding where you are in your system. For example, in web programming in Java, you have a Request, and a Response. These are passed to the service method of a Servlet. A property of the Servlet is the ServletConfig, and within that is a ServletContext.

What is DbContext C#?

What is the difference between EF and EF core?

EF Core offers new features that won’t be implemented in EF6. This is a high-level comparison and doesn’t list every feature or explain differences between the same feature in different EF versions. The EF Core column indicates the product version in which the feature first appeared.

Should I use LINQ or Entity Framework?

If your database is straightforward and simple, LINQ to SQL will do. If you need logical/abstracted entities on top of your tables, then go for Entity Framework.

What does EF include do?

As a performance measure, Include() allows you to indicate which related entities should be read from the database as part of the same query. Excerpt from the linked page: Here are several ways that the Entity Framework can load related data into the navigation properties of an entity: Lazy loading.

What is lazy loading in EF?

Lazy loading is the process whereby an entity or collection of entities is automatically loaded from the database the first time that a property referring to the entity/entities is accessed. Lazy loading means delaying the loading of related data, until you specifically request for it.

What does include with where do in EF +?

EF+ Query IncludeFilter feature allows filtering related entities. In my case the Include was an ICollection, and also did not want to return them, I just needed to get the main entities but filtered by the referenced entity. (in other words, Included entity), what I ended up doing is this.

Which is the context class in Entity Framework?

Context Class in Entity Framework. The context class is a most important class while working with EF 6 or EF Core. It represent a session with the underlying database using which you can perform CRUD (Create, Read, Update, Delete) operations.

What does find do in the Entity Framework?

That is, Find will return entities that have been added to the context but have not yet been saved to the database. The following code shows some uses of Find: Entity Framework allows your entities to have composite keys – that’s a key that is made up of more than one property.

Is the include method in EF Core 5.0 supported?

Now EF Core 5.0 ‘s Filter Include method now supports filtering of the entities included This feature has now been added to Entity Framework core 5. For earlier versions you need a work-around (note that EF6 is an earlier version).