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Activity for Marc.2377
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Comment | Post #280662 |
I deleted it myself due to poor reception. Never liked that site anyway. [Here's an archived version](https://web.archive.org/web/20210209211132/https://softwareengineering.stackexchange.com/questions/421833/how-best-to-implement-a-data-access-layer-for-this-architecture). (more) |
— | over 3 years ago |
| Comment | Post #280670 |
I am aware of the XY nature of this question, but asked it anyway because I wanted to know whether this could be done, since the entire thing is an exercise to get a better grasp of the language and its capabilities. I'm satisfied with the response. (more) |
— | over 3 years ago |
| Comment | Post #280670 |
My final goal is to have an interface to be able to use EF Core in my application services layer while enforcing that whatever custom DbContext-like implementations an user might want to implement in the future provides the same set of functionality in order to require minimal changes to the applicat... (more) |
— | over 3 years ago |
| Comment | Post #280666 |
Good point. I think I have one use case for updating both the relational and document datastores in one atomic operation, but for the majority of cases you are correct. (more) |
— | over 3 years ago |
| Comment | Post #280670 |
I think I got it, if you may have a look at my answer below, tell me if that makes sense and is correct. (more) |
— | over 3 years ago |
| Edit | Post #280671 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Declaring interface members with generic return types: "The type parameter [generic type] cannot be used with type arguments" I believe an implementation of the answer by Peter Taylor above would be: ```cs public override EntityEntry Add([NotNullAttribute] TEntity entity) where TEntity : class { return Add(entity, base.Add); } public TEntityEntryTEntity Add([NotNullAttribute] TEntity entity, [NotNull... (more) |
— | over 3 years ago |
| Comment | Post #280670 |
... and/or, how the implementation of this interface should be done. (more) |
— | over 3 years ago |
| Comment | Post #280670 |
Thanks. Could you give an example of what the factory method implementation would look like? (more) |
— | over 3 years ago |
| Comment | Post #280665 |
@FoggyFinder is that so I can enforce new user-created context types to provide the same set of methods.
(more) |
— | over 3 years ago |
| Comment | Post #280665 |
@FoggyFinder yes, the interface must be applicable to the method already defined in the base class, which in this case is part of the framework.
(more) |
— | over 3 years ago |
| Comment | Post #280666 |
... and when some queries will be made to both databases, sharing a `TransactionScope`.
(more) |
— | over 3 years ago |
| Comment | Post #280665 |
... then the only valid implementation would be: `public EntityEntry Add<TEntity>(TEntity entity) where TEntity : class` - but I want the implementation that already exists in the base class (`DbContext`) to be valid. And its signature returns `EntityEntry<TEntity>`.
(more) |
— | over 3 years ago |
| Comment | Post #280665 |
@FoggyFinder I tried, but then in my class that inherits from `DbContext` I get: `Error CS0738 'EntityFrameworkContext' does not implement interface member 'IDbContextable<EntityFrameworkContext, EntityEntry>.Add<TEntity>(TEntity)'. 'DbContext.Add<TEntity>(TEntity)' cannot implement 'IDbContextable<E... (more) |
— | over 3 years ago |
| Comment | Post #280666 |
Thanks. Does your approach change in any way in the case where the secondary database is non relational? (more) |
— | over 3 years ago |
| Edit | Post #280665 | Initial revision | — | over 3 years ago |
| Question | — |
Declaring interface members with generic return types: "The type parameter [generic type] cannot be used with type arguments" I'm trying to write an interface to define the set of operations I expect my repositories' Unit of Work implementations to have, and I want this interface to be fulfilled by EF Core's `DbContext` class. So far this is what I got: (I know the name is awful, suggestions accepted): ```cs public i... (more) |
— | over 3 years ago |
| Comment | Post #280662 |
Posted a more elaborate/specific version of this to Software Engineering SE: [How best to implement a Data Access layer for this architecture?](https://softwareengineering.stackexchange.com/q/421833/183949) (more) |
— | over 3 years ago |
| Edit | Post #280662 |
Post edited: |
— | over 3 years ago |
| Edit | Post #280662 |
Post edited: |
— | over 3 years ago |
| Edit | Post #280662 | Initial revision | — | over 3 years ago |
| Question | — |
How to separate DB query logic from the application other than implementing a repository on top of an ORM? I've been doing a lot of reading on implementing the repository pattern in C# projects and found controversy, or shall I say some strong criticism, made by seemingly very smart people with previous experience with the pattern, saying that one is better off not implementing a repository on top of an O... (more) |
— | over 3 years ago |
| Edit | Post #278924 |
Post edited: copy-edit |
— | almost 4 years ago |