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Is Entity Framework connected or disconnected?
There are 2 ways (connected and disconnected) when persisting an entity with the Entity Framework. Both ways have their own importance. In the case of a connected scenario the changes are tracked by the context but in the case of a disconnected scenario we need to inform the context about the state of the entity.
Which is better connected or disconnected architecture?
connected data needs connection to be created to access hence slower while disconnected is in memory data that’s faster access. to access connected data you use ADO.NET whereas for disconnected you do not use. disconnected-data can be accessed from multiple tables in a dataset.
When does Entity Framework operate in disconnected mode?
In that sense, Entity Framework always operates in disconnected mode. Each database operation by EF opens and closes the database connection (unless you explicitly override this behavior). But in software architecture, ‘connected’ and ‘disconnected’ usually refer to 1-tier vs. N-tier.
How to deal with disconnected entities in EF Core?
The best way to avoid this being an issue is to use a short-lived context for each unit-of-work such that the context starts empty, has entities attached to it, saves those entities, and then the context is disposed and discarded. The simplest case to deal with is when the client informs the server whether the entity is new or existing.
How to add an entity to the context?
Another way to add a new entity to the context is to change its state to Added. If you have an entity that you know already exists in the database but which is not currently being tracked by the context. You can tell the context to track the entity using the DbSet.Attach. The entity will be in the Unchanged state in the context.
What is the attach method in Entity Framework?
While DbSet.Add is used to tell Entity Framework about new entities, DbSet.Attach is used to tell Entity Framework about existing entities. The Attach method will mark an entity in the Unchanged state. Let’s take a look at the following C# code in which a disconnected entity is attached with DbContext.