Entity Framework Core Feature Suggestions

Welcome! Use this web site to submit ideas and vote for what features you want to see in future versions of Entity Framework Core.

Our team will only fix bugs, implement small improvements and accept community contributions in the EF6 codebase. Larger feature work and innovation will happen only in the EF Core codebase. If you have ideas for improving EF6, we recommend you submit them on the EF6 GitHub site listed below.

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  1. 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.

    18 votes
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      0 comments  ·  tools  ·  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 →
      • 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 →
          • SqlDependency / query notification

            in ADO.NET classic thers an option to get a notification from SQL when data changes in the database, using the SqlDependency class for specific queries. i would like to see this supported in the next EF

            17 votes
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              1 comment  ·  runtime  ·  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 →
              • Future Queries

                I didn´t find any topic about this, but is very important.

                Its described here: https://github.com/loresoft/EntityFramework.Extended#future-queries

                // build up queries
                var q1 = db.Users
                .Where(t => t.EmailAddress == "one@test.com")
                .Future();

                var q2 = db.Tasks
                .Where(t => t.Summary == "Test")
                .Future();

                // this triggers the loading of all the future queries
                var users = q1.ToList();

                16 votes
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                  0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                • Filtering support in databinding

                  Add Filter and Sort support to Windows Forms BindingSource when bound to EF as in example below.

                  Dim context As New MyEntities
                  context.Employees.Load()
                  EmployeeBindingSource.DataSource = context.Employees.Local.ToBindingList()

                  'Would like the following to then work
                  EmployeeBindingSource.Filter = "FirstName = 'SANTA'"
                  EmployeeBindingSource.Sort = "FirstName"

                  I use data-driven filters stored outside of the application, so new filters and sorts may be added without new code.

                  See also
                  https://connect.microsoft.com/data/feedback/details/704105/entity-framework-winforms-datagridview-support-for-bindingsource-filter-sort-and-column-heading-sort#details

                  16 votes
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                    1 comment  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                  • [DefaultValue(...)] is not handled by Code First migration

                    In a column I can add [DefaultValue] attribute, but at the end it is ignored by the migration step. Confused. Please add support for this.

                    16 votes
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                      1 comment  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
                    • let me save expensive intermediate LINQ results in temp table

                      LINQ-to-Entities should offer an anaogous operator to AsEnumerable() but instead of materializing results on the client, it would materiailze results on the server (e.g. a temp table for SQL Server), allowing subsequent operators to re-use intermediate results without risking additional server recomputation or requiring a round-trip from client to server.

                      The underlying requirement is to make it easier to build and maintain performant LINQ queries that use millions of rows, many complex joins, I/O intensive calculations like running totals or self-joins, or all of the above.

                      For these kinds of queries in T-SQL, a good way to get predictable performance…

                      15 votes
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                        0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                      • 15 votes
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                          1 comment  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                        • Partial-selection and auto-mapping for DTOs

                          I've read the post http://blogs.msdn.com/b/adonet/archive/2011/01/30/using-dbcontext-in-ef-feature-ctp5-part-5-working-with-property-values.aspx, it's beautiful, and I have some additional requests:

                          1) I should be able to decorate some properties in my DTOs so it can have a different name (or decorate them at runtime with type-description).
                          2) Should be able to select partial queries:
                          - Via property selectors (both typed and strings) via DTO initializers
                          - Via constructor of another class (in EF4 this is not allowed) I mean .Select(u=> new FatUnicorn(u.Id, u.CornLength));
                          - As per the previous example, should also be: context.Unicorns.Select<UnicornSummary> using the method of assigning matching property names or decorated with attributes as…

                          15 votes
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                            2 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                          • Interchangeable Backing Database

                            I would like to write my code against the EF and have it work with SqlServer Express and SQlServer Compact (or even MySQL and Oracle). It would be great if I could swap these out at runtime, even, pointing to different databases as needed. This would require some improvements to SQLServer Compact, but also some improvements to EF.

                            14 votes
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                              0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                            • Cascade Delete and Update Attribute

                              It would be great to have attributes to indicate whether to cascade delete and updates rather than having to use the fluent api.

                              14 votes
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                                0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                              • Support SQL Server Schemas/Owners as CLR namespace/classes

                                SQL Server schemas (or owners) should reflect into CLR namspace branches or inner classes.

                                If you have Sales.Customer and Orders.Customer on the database, that shouldn't be Customer and Customer1.

                                14 votes
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                                  2 comments  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
                                • Encryption of Columns

                                  Would be nice to be able to map encryption to a column. have a convention based or override using a
                                  function (Func<>).

                                  13 votes
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                                    1 comment  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                  • Add Support for custom Extension methods

                                    Support extension methods to be defined for entities or generic extensions. As long as the extension returns an IQueryable or expression that only includes supported operations/extensions, then the provider should expand the extension method and replace it in the expression tree with the the returned iqueryable/expression.

                                    Thus for the most part, any extension method encountered in the expression that is not supported, should be called to return an expression that can be inserted into the expression tree. So long as the process operators recursively as it is expanding the expression, eventually the expression tree will consist of supported expressions and…

                                    13 votes
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                                      2 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                    • Support lazy loading proxies on internal POCO classes

                                      I'd really like to not have all my model classes declared as public. Please support classes declared as internal. Even if there is a requirement to add InternalsVisibleTo("EntityFramework") or similar to the AssemblyInfo that is fine.

                                      13 votes
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                                        0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                                      • Database VIEW creation support and specific mapping of entites to views.

                                        Currently, to get Code First to create a database with a VIEW, the CREATE VIEW sql statement must be hacked a couple of Context.Database.ExecuteSqlCommand's. One to drop the table that EF created for the entities you're mapping to it and another to create the view using the same name as the table EF assumes is still there.

                                        When mapping an entity to a view, you have to use modelBuilder.Entity<T>.ToTable and treat the view as a table. Entity Framework assumes the view is still a table and assumes it's read/write. A new method of .ToView might be added to tell EF…

                                        13 votes
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                                          0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                        • Foreign Key Constraints on Views

                                          The "create/update modell from database" functions of the EF designer should support foreign key constraints on views.
                                          As a result of the foreign keys we get navigation properties on the views.

                                          (In Oracle database it is possible to create (disabled) foreign keys between views.)

                                          13 votes
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                                            1 comment  ·  Flag idea as inappropriate…  ·  Admin →
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