Entity Framework Feature Suggestions

Welcome! You can use this site to tell the Entity Framework Team what features you want to see in future versions of our products.

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  1. Foreign key (from attribute and fluent) without navigation property

    Right now you have to define a navigation property set a foreign key constraint on a column.
    For people that want to achieve some independence from EF (using the repository pattern, for example, and a key-value store as a possible alternative), plainer POCOs with just ids are important.
    For example, with the repository pattern, I am right now able to use the same data classes and the same IRepository for an EF backed data store and a Redis-backed one.

    Defining a foreign key without the navigation property is still important and useful for data integrity.

    If could be something like …

    21 votes
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      0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
    • More informatin from referential integrity constraint violation exception

      I get so frustrated by the referential integrity constraint violation and the fact that the exception thrown contains no information about which fields are causing the problem.

      Here's the full message for reference:
      "A referential integrity constraint violation occurred: The property values that define the referential constraints are not consistent between principal and dependent objects in the relationship."

      Could you please update this exception to provide some key information so that we can track this issue down?

      Thanks,
      -Aaron

      21 votes
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        0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
      • Foreign Key naming should use suffix 'Id' (or configurable string)

        When generating a model from a database using foreign keys, the model generator ends up calling the foreign key id field 'blah' and the navigation property 'blah1'. Instead the generator should use 'blahId' (or configurable suffix) for the foreign key numeric and 'blah' for the navigation property to make the accessing functions more obvious to developers

        20 votes
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          1 comment  ·  Flag idea as inappropriate…  ·  Admin →
        • Partial SaveChanges

          Should be able to SaveChanges of certain entities while leaving the other entities in Added etc. mode, this is useful when you want to save data in a page that some other parts of the page contain invalid data that can't be saved.

          20 votes
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            0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
          • Updateable Views

            I would like to see update-able views. This is available in Telerik ORM, and I have found it very helpful in situations where I initially assumed a grid would only need to display read only data, but was months later asked to allow editing.

            There are other ways to do this of course, but they require recoding. This would make certain maintenance tasks easy.

            19 votes
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              1 comment  ·  Flag idea as inappropriate…  ·  Admin →
            • 19 votes
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                1 comment  ·  Flag idea as inappropriate…  ·  Admin →
              • 19 votes
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                  0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                • Compiled Code First

                  The current EDMX designer doesn't work well for enterprise scenarios - it becomes incredibly cumbersome as the number of entities grows. For example:
                  * It forces the developer to arrange entities visually - once you get over about 10 entities or complex relationships between them, it becomes difficult to do.
                  * It's difficult to find entities - rather than scan for them alphabetically, I need to scroll around a complex diagram I don't really want.
                  * The wizards get in the way - updating my model continually prompts me to modify my connection strings, I need to manually select the…

                  19 votes
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                    1 comment  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →

                    Updating the title. The part about reverse engineering a database into a Code First model is included into our VS tooling in EF 6.1. I mark that as completed and split the part about having a “compiled” Code First model that loads very fast, but splitting ideas is not supported in UserVoice :)

                  • Be able to configure initial value for identity column

                    Currently when configuring Identity columns we can't declare the initial value. It would be nice to add an option in order to specify the initial value. This is not respected when we reverse engineer an existing database as well

                    19 votes
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                      0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                    • Customize ModelObjectItemWizard to be able to add new items

                      I want to be able to customize Microsoft.Data.Entity.Design.VisualStudio.ModelWizard.ModelObjectItemWizard
                      So I can add my custom items to Microsoft.Data.Entity.Design.VisualStudio.ModelWizard.Gui.ModelBuilderWizardForm like I show on this updated screenshot
                      http://clip2net.com/clip/m407107/8fb72-entity-framework-wizard-customization2-35kb.png?nocache=1

                      In particular I want to add "ASP.NET Identity 2.0 EF Designer model" which will already contain all the entities required for ASP.NET Identity 2.0 to work.

                      18 votes
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                        0 comments  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
                      • Map multiple entities to same table

                        I should be able to map multiple models to the same table. For example consider a User table. I may have a model for logging in, changing a password, resetting a password and maintaining a user. I would normally create different domain models for each of these use cases. However, I am not able to map these models to a single table.

                        Here is a link with a workaround by MSFT, but would like to avoid workaround...
                        http://social.msdn.microsoft.com/Forums/en/adodotnetentityframework/thread/0f65caae-8a66-431f-aa02-4b2c68f871e9

                        18 votes
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                          0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                        • Add FILEGROUP Support

                          It should be possible to create tables, indices, etc. on different file groups in order to improve performance.

                          18 votes
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                            0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                          • EdmGen.exe should support generating an edmx file from a connection string

                            EdmGen.exe should support generating an edmx file from a connection string.

                            In .net 3.5, EdmGen2.exe (http://archive.msdn.microsoft.com/EdmGen2) was able to generate an edmx file from a connection string.

                            But for (EF) .net 4.0, we have lost this ability.

                            Thank you.

                            18 votes
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                              1 comment  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
                            • Support for SQL Server Change Data Capture -- or at least tables with no primary keys

                              Change Data Capture is one of the coolest features in SQL Server 2008+. I know it's not core to tailor things for one database technology, but this feature is completely unsupportable in the current EF because EF doesn't allow tables without PKs (and the tables SQL Server gens for CDC have no PKs). Ideally, some sort of real support would be allowed that would allow for some sort of Entity.CDC or something that would string together the tables that an entity uses ... but that is probably a bridge too far.\

                              17 votes
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                                0 comments  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
                              • Ability to intercept and cancel changes to properties

                                (Note that the original description of this idea talked about making PropertyChangingEventArgs cancellable. Although this is an interesting request, it is not a change we could implement in EF. In fact, there is probably not way it can be implemented in .NET without defining a new standard interface for change tracking)

                                Rather than declining the idea, I am renaming it to capture the essence that is still potentially applicable to EF: provide a hook that can be used by an application or library to intercept what happens whenever EF detects that a property of a tracked object is being changed…

                                17 votes
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                                  3 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                • Support json linq queries

                                  As MS is adding json support to Sql Server 2016 it would be great if EF could support this with linq queries and convert a tree with arrays to nested lists.

                                  17 votes
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                                    1 comment  ·  Flag idea as inappropriate…  ·  Admin →
                                  • Ability to intercept when an association is being changed

                                    There should be an AssociationChanging in System.Data.Objects.DataClasses.RelatedEnd class, so I can validate before items get attached to a relation.

                                    17 votes
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                                      2 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                    • Remove sysdiagrams from Tables in Update Model From Database

                                      SysDiagrams always appears in the list of table when Upgrading Model from Database. This is just noise and therefore a nuisance.

                                      17 votes
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                                        0 comments  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
                                      • Support concurrency checks in derived types when using TPT inheritance

                                        Remove the limitation to perform concurrency checks on derived types. Now you may only use properties from the base type for concurrency checks.

                                        17 votes
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                                          0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                                        • Add ability to include multiple edmx files in another edmx file

                                          Allow to split single model to multiple edmx-files and use any subset of these files in any file of set.
                                          Sometimes most of entities of large model are linked but there is theoretical possibility to split them to several subsets to parallelize work in team.
                                          Single edmx file sometimes caused conflicts during merging changes produced by different developers of team. Multiple linked edmx-files could prevent conflicts.
                                          Existing Using element exists only in CSDL model and is not supported by designer.

                                          17 votes
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                                            0 comments  ·  Flag idea as inappropriate…  ·  Admin →
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