How do you change the state of entity using DB context?
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How do you change the state of entity using DB context?
This can be achieved in several ways: setting the EntityState for the entity explicitly; using the DbContext. Update method (which is new in EF Core); using the DbContext. Attach method and then “walking the object graph” to set the state of individual properties within the graph explicitly.
How do I track changes in Entity Framework?
Entity Framework – Track Changes
- The Change Tracking tracks changes while adding new record(s) to the entity collection, modifying or removing existing entities.
- Then all the changes are kept by the DbContext level.
- These track changes are lost if they are not saved before the DbContext object is destroyed.
How do I turn off lazy loading in Entity Framework?
To turn off lazy loading for all entities in the context, set its configuration property to false….Rules for lazy loading:
- context. Configuration.
- context. Configuration.
- Navigation property should be defined as public, virtual.
What’s a recommended approach for using EF in disconnected applications?
Following are the two steps that needs to be taken with disconnected entity graph or even a single disconnected entity. Attach entities with the new context instance and make context aware about these entities. Set appropriate EntityStates to these entities manually.
What is change tracker?
Change tracking is a lightweight solution that provides an efficient change tracking mechanism for applications. Typically, to enable applications to query for changes to data in a database and access information that is related to the changes, application developers had to implement custom change tracking mechanisms.
Do you think lazy loading is better than eager loading?
Lazy Loading vs. Eager Loading. While lazy loading delays the initialization of a resource, eager loading initializes or loads a resource as soon as the code is executed. Eager loading also involves pre-loading related entities referenced by a resource.
Does EF core lazy load by default?
The advice is not to use lazy loading unless you are certain that it is the better solution. This is why (unlike in previous versions of EF) lazy loading is not enabled by default in Entity Framework Core.
Which method is used to let the DbContext know an entity should be deleted?
DbContext. Remove Method (Microsoft.
What is difference between connected and disconnected architecture in Ado net?
Either it can be connected architecture where you go and connect to the database and get data or disconnected architecture where you connect to the database first time and get all data in an object and use it if required. You can perform any action like insert, update, and search on this.
Why do we use DbSet?
A DbSet represents the collection of all entities in the context, or that can be queried from the database, of a given type. DbSet objects are created from a DbContext using the DbContext. Set method.
Which entities allow lazy loading?
Yes, lazy loading is enabled in the Entity Framework ORM too, it is on by default in Entity Framework, so if you want to enable lazy loading in Entity Framework, you don’t need to do anything.
