¿Cómo clonar valores de entidad con Entity Framework?

How to clone entity values with Entity Framework?

There are many examples in the vastness of the Internet based on Object.Clone () or Reflection.// But this is not necessary. Entity Framework has inherent methods to copy values. To simply copy values from an existing entity to a new entity, you have two stable ways. Copy values to a local var first:

If all you want to do is clone the entity in a detached state, you can add the entity to the context, set its current values, then detach it. This is not a deep clone. The question title and text ask about a deep clone to “copy the entity and all related objects”.

If all you want to do is clone the entity in a detached state, you can add the entity to the context, set its current values, then detach it. – Suncat2000 Dec 28 ’16 at 18:25 This is not a deep clone. The question title and text ask about a deep clone to “copy the entity and all related objects”. – Zach Mierzejewski Apr 30 ’18 at 21:27

Entity Framework has inherent methods to copy values. To simply copy values from an existing entity to a new entity, you have two stable ways. Copy values to a local var first: Directly copy values from old entity to new entity. These methods are stable and not based on any Reflection tinkering.

This is an Extension Method to EntityObject. This uses a DataContractSerializer to serialize the object. The cloned Entity will be returned back to the caller. LoadAllChild will load all the associated child objects of the base Entity from the database.

Entity cloning: How to clone an Entity and all its associations in LINQ to Entities (Entity Framework). This involves popping the data into the database back after cloning. Note:new version fixed error ‘An Object w with Same Key is already exists ‘.

The Item has also Parameters, which should be cloned as well. The ItemType, however, should be left as a reference to the existing ItemType. With the help of Stackoverflow ( Entity Framework 5 deep copy/clone of an entity) I have come up with the following rather lousy attempt:

TopicId’s value is that of the selected item from the DropDownList. Because the query string name matches the Screencast’s property name, ASP.NET MVC model binding uses the value for the TopicId property of the Screencast instance it creates for the method parameter, as you can see in Figure 4.

What I would like to do is duplicate/copy my School object and all of its children/associations in EF Core I have something like the following: I have been reading up on deep cloning and it seems that I should be able to do just add the entity…so pretty much the next line. Then EF should be smart enough to add that entity as a NEW entity.

I have a class, say Automobile, that has over 50 different properties (color, year, make, model, etc.). The Automobile class itself has a relationship with other entities and therefore some of those properties are references. Somewhere in my code I use Linq and fetch an Automobile object let’s call it X.

However, if a foreign key is pointed at another piece of data that has been detached, the foreign key will be updated to point at the new, duplicate data. This way, if the database duplicates related entities in the same transaction, their relationships will be duplicated as well. Here is the idea in practice.

I am using Entity Framework 5 ( DBContext) and I am trying to find the best way to deep copy an entity (i.e. copy the entity and all related objects) and then save the new entities in the database. How can I do this? I have looked into using extension methods such as CloneHelper but I am not sure if it applies to DBContext.

However I believe because the Id’s of the child objects are set and the relationship of the children is always one to many. The original object pageFromDb will lose all it children as entity framework instead of creating new Section objects for the cloned Page will update the Section.PageId to the newly inserted page.