Now in my code, I’ve injected my expression replacing into the mapping configuration and query pipeline so that if I refer to the collection property, the expression gets redirected to the backing protected property. Since my EF queries flow through AutoMapper projections, I made sure that I call the DelegateDecompiler’s Decompile method in my extensions:Īnd finally, I need to create my own Include method that replaces EF: There is a catch, however, in that if we filter based on that property or use Include, we’ll need to run through the same expression redirection process. From inside an EntityTypeConfiguration class:ĮF will now use the protected property to load behind the scenes, even though we’re referring to the public property.
#Ef collection code
When we configure EF Code First, our custom HasMany method will be called instead of the EF Code First one, which only accepts ICollection. DelegateDecompiler peers into the property of my IEnumerable, recognizes that it’s referring to another property, and then we swap out our IEnumerable property with the found ICollection one: Then we’ll need to expose our own custom HasMany EF Code First extension method that redirects the property from our IEnumerable one to the backing field. First, our DelegateDecompiler configuration: Next, we’ll use the DelegateDecompiler project to help rewrite our expressions that refer to the IEnumerable property.
#Ef collection full
We’ve encapsulated our private field into a protected property with the same naming scheme, so only my Order class (or the proxy subclass) can access the full collection. First, let’s add our protected backing property instead of that private field (protected to get lazy loading etc): But what if we used a protected property instead? Or exposed the expression in other ways? One way is to use expression tree rewriting to refer to the public readonly property in one way, but trick EF into looking at a protected property instead (thanks hazzik). You can do tricks to trick EF to map to a field, but underneath the covers, it won’t be able to do things like tracked entities, lazy loading or eager fetching.
Our collection is now fully encapsulated, however, EF doesn’t support mapping to private fields. To address this issue and only expose operations which we want to allow, we invoke the encapsulate collection refactoring: We might have an operation that needs to invoke some side effects as the result of adding or removing from the collection:īut since we expose the collection directly, we can run into some inconsistencies: For encapsulated domain models that enforce their own consistency boundary, encapsulating a collection is quite important to ensure your domain model stays consistent. The list of missing EF features is quite long, but several of the items in the list do have workarounds. The following table lists database providers and NuGet packages for EF Core.Missing EF Feature Workarounds: Encapsulated collections 9 May, 2014. EF Core includes providers as NuGet packages which you need to install. Learn more on EF Core and EF 6 differences at here.Įntity Framework Core uses a provider model to access many different databases.
EF Core is new, so still not as mature as EF 6.ĮF Core continues to support the following features and concepts, same as EF 6.ĮF Core will include most of the features of EF 6 gradually. This has limited support in EF Core as it does not support visual designer or wizard.Įntity Framework Core is the new and improved version of Entity Framework for. In the database-first approach, EF Core API creates the domain and context classes based on your existing database using EF Core commands. This approach is useful in Domain Driven Design (DDD). In the code-first approach, EF Core API creates the database and tables using migration based on the conventions and configuration provided in your domain classes. EF Core mainly targets the code-first approach and provides little support for the database-first approach because the visual designer or wizard for DB model is not supported as of EF Core 2.0. EF Core Roadmap: /en-us/ef/core/what-is-new/roadmapĮF Core Official Documentation: EF Core Development ApproachesĮF Core supports two development approaches 1) Code-First 2) Database-First.
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