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. Add DbContext.Database.SqlQuery to Entity Framework Core

    I can't always get the best performance for extremely specific queries queries in Entity Framework. Sometimes it is best to just write very specific SQL (Currently working on a CTE recursive query that I wouldn't even know how to begin getting into EF without hitting the DB multiple times). Having SqlQuery<T> available give me complete freedom and allows me to use EF in the same way as Micro ORMS like Dapper to map a specific DTO when it makes sense. I don't wan't to have to map a custom object to my context and use the FromSql implementation off of…

    94 votes
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      6 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
    • Allow dynamically adding properties to entities and complex types

      want to use the entity framework. However I also have the requirement of allowing my users to define custom fields in our system. I would like to still use the entity framework and not use a a partial class with a hash table property.

      80 votes
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        2 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
      • Support FileStream and FileTable

        please add SQL Server 2012 features to new release of entity framework and code first that support filestream and filetable

        70 votes
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          1 comment  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
        • Reverse engineering should generate XML documentation from SQL description fields

          When generating from database, the EDMX designer should generate XML Documentation (Summary field) from the SQL Description field of each table/column etc.

          68 votes
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            10 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
          • Ability to map any serializable object to XML, JSON or binary columns

            For example a database table could have a [Settings] column of type xml. And a mapped entity type could have a property [Settings] of some serializable type. Then you will be able to read and write data into and from this [Settings] column with EF. Like this:

            var user = db.Users.First(x => x.ID == 1);
            if (user.Settings == null)
            {
            user = new Settings();
            }
            user.Settings.ProductsPerPage = 20;
            db.SaveChanges();

            66 votes
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              3 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
            • Use several Code First Data Contexts and several (different) Migrations in one database

              Say there is one database shared by several applications, objects are separated by schema. So it would be nice to be able to store and apply migrations for one schema independently from another one.

              60 votes
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                9 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
              • 54 votes
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                  2 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                • Stored procedure support for eager loading graphs

                  So far a stored procedure can return only a plain entity. It would be great if we could create a stored procedure that returns orders and details information in a single roundtrip.

                  54 votes
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                    1 comment  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                  • Make LINQ to Entities recognize GetValueOrDefault()

                    I have a LINQ query that involves a nullable integer. When I try to run the query, I get the following error:

                    "LINQ to Entities does not recognize the method 'Int32 GetValueOrDefault(Int32)' method, and this method cannot be translated into a store expression."

                    I am not a L2E or EF guru in the least, but it seems like that should translate to the SQL ISNULL function shouldn't it?

                    Regardless, can you please make this functionality work?

                    46 votes
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                      2 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                    • Built-in entity auditing!

                      EF should have some better data change tracking/auditing plumbing...on par with the extensive trace listener class support in ASP.NET. In order to create an audit history of the CRUD actions taking place within my entity model in EF 4.0, I had to write a lot of custom code and override the SavingChanges event and the OnContextCreated method to make it happen. Even now it doesn't properly catch all actions due to certain limitations (such as having DB-set identity fields). Think about how to make auditing data changes simpler and richer for devs!

                      38 votes
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                        4 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                      • Support for MERGE (UPSERT) statement

                        I would like to see the T-SQL MERGE statement supported. For multi threading situations it really would be useful.

                        38 votes
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                          0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                        • Result of Sum() of an empty set should be 0 rather than NULL in LINQ to Entities

                          Currently if an empty set is expected it is necessary to cast either the result or the input elements of Sum to Nullable<T> to compensate for the type mismatch between the SQL database and the signature of the methods in LINQ.

                          38 votes
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                            6 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                          • Support for DateTime built-in operations in LINQ to Entities

                            Some customers want to write queries that include such expressions as "date1 - date2" or "datetime3 + timespan1 > datetime4". LINQ to Entities currently support some of date/time operations through the EntityFunctions.AddX and DiffX functions, but it doesn't support built-in operators with data/time types.

                            37 votes
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                              1 comment  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                            • Bulk Insert

                              ADO.Net supports bulk insert for big amount of data. With the help of this library
                              http://archive.msdn.microsoft.com/LinqEntityDataReader
                              It is possible to do Bulk inserts with entities. But it would be nice if there would be a integrated approach.

                              31 votes
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                                0 comments  ·  runtime  ·  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.

                                26 votes
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                                  0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                • Update database without seeding

                                  It would be great to be able to do an "update-database" without having to execute the seeding commands as well. We are seeding quite a lot of meta data into our system, and it is a waste of time to wait for seeding each time we update/manipulate our model.

                                  A flag in command prompt like

                                  update-database -noseeding

                                  would suffice.

                                  26 votes
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                                    0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                  • Exclude function as opposed to Include

                                    There should be to each Linq to Entities query an extension "Exclude" that returns IEnumerable<TSource> and the excluded fields will not be selected from the store/source.

                                    25 votes
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                                      0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                    • Updating the F# SqlEntityConnection Type Provider

                                      The F# SqlEntityConnection Type Provider is a third way to interact with Entity framework (with the other two being an .edmx file and Code First).
                                      http://msdn.microsoft.com/en-us/library/hh362322.aspx

                                      This Type Provider doesn't support the updated low-level API changes that EF 6 requires, as far as I can tell. I'd love to have an updated version that supports the async features of EF 6.

                                      22 votes
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                                        1 comment  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                      • More information 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

                                        22 votes
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                                          0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                        • Support read-only mapping to tables without key

                                          Allow mapping of database views without requiring the Key Attribute

                                          When mapping entitis to Views, it´s common that no Key can be set, bescause the view does not provide it and you can´t map it. The idea is:

                                          * Make it possible to map to Views (or tables) in a read only fashion that does not require the Key Attribute

                                          20 votes
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                                            1 comment  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
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