Entity framework savechanges not updating
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Saving a Disconnected Entity in EF 6
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As it's name implies, it perform the work, Entiyy heavy lifting, for the application. It's only job is to batch-transactionalize insert, update and delete commands. Nlt leaves relatively few things for the repository to be responsible for. So let's take a look at what's left: Neither should be injected into the other, nor should either act as a factory for the other. In this arrangement, the name 'repository' is a bit of a misnomer. The name suggests 'the place you put things', but in reality it is 'the place you get things'. I'd call for a change in name, but it's too widely used under this name. So how would you go about implementing these?
Framework savechanges not updating Entity
First, let's do the repository, as it is the simplest: You can, and should. At first, you may simply use a common "Entity" base class, but as you progress, you will start Enntity distinct types for aggregate root and dependent entities, at which point, you will want to force your repository to act only upon aggregate svaechanges. For now, an exact type isn't required. This is a good idea because, as you progress, you will find yourself using things other than a db-filled int. The Find method supports any type usable as an id, including int, string, Guid, and others.
Having this method be open to any id type means less work on your part. Ok, now let's take a look at the unit of work implementation. This one is a little more involved, so take your time and review the sample code: Entry entity. This can be achieved in several ways: Attach method and then "walking the object graph" to set the state of individual properties within the graph explicitly. State property, which is made available by the DbContext. Entry method.
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Entry author. Modified; context. Any related objects will not be tracked. Since the ChangeTracker is unaware of which properties were modified, the updzting will issue an Saechanges statement updating all property values apart safechanges the primary key value. Update author ; context. Once again, the context doesn't have any way of identifying which property values have been changed, and will generate SQL to update all properties. Where this method differs from explicitly setting the State property, is in the fact that the context will begin tracking any related entities such as a collection of books in this example in the Modified state, resulting in UPDATE statements being generated for each of them.
Attach When you use the Attach method on an entity, it's state will be set to Unchanged, which will result in no database commands being generated at all. All other reachable entities with key values defined will also be set to Unchanged. Those without key values will be marked as Added.
However, now that the entity is being tracked by the context, you can inform the context which properties were modified so that the correct SQL to update just those values is generated: Attach author ; context. Property "FirstName". This is useful in scenarios where you are dealing with complex object graphs that consist of various related entities in differing states. The following example replicates a scenario where an object graph is constructed outside of the context. Then the TrackGraph method is used to "walk the graph":