What is the difference between a "Model" and a "Context" in Entity Framework jargon?

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What is the difference between a "model" and a "context" in Entity Framework jargon?

I'm using the Entity Framework database first approach in an application. These terms have come up many times as I've been reading different forums and articles on EF implementation strategies. I can't seem to figure out how these two are different (not even with just entity framework, but with software development in general). People use the words as if they are different, but then some people seem to use the words interchangeably.

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Loosely speaking a context relates to a database connection or session wherea the model is the mapping between tables, views, etc to data access object classes (i.e., objects that will contain the data)

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A model is a class which usually represents a database table or structure to display a database table. For example, if I had a database for cars, then a model for car could be

public class Car
 public int CarId { get; set; }
 public string Make { get; set; }
 public string Model { get; set; }
 public int Year { get; set; } 

This model is used by entity framework and the sql provider (for mysql or mssql usually) to compose a query against a database. The query requires a way for this to be mapped, and that is the job of the context. The context usually extends DbContext and is what is used for the facade of accessing the database table as an in memory object.

public class CarContext : DbContext
 DbSet<Car> Cars { get; set; }

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  • The DbContext class is the base class that allows for database querying used in EF. The model in the MVC sense can refer to the general domain that includes entities (also named models) and database connections or might refer to a model, in which they basically mean a class that is used to represent your data (for example Person).
  • Considering bullet point #2 from your answer, what would be the reason why anyone would ever have more dbContexts than models and vice-versa? Is there a best practice when it comes to the number of models (edmx's) to the number of contexts used?
  • @user1431072 There can be reasons to have separate contexts each representing distinct parts of the database. For instance, if there are separate tables for authorization you could have an authorization context (with accompanying authorization class model) and a business context. More (store) models than context is not possible: a context accesses one database.