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.

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  1. 19 votes
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      0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
    • 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 →
      • 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.

        18 votes
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          2 comments  ·  runtime  ·  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 →
            • 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 →
                • 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 →
                        • 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 →
                            • 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 →
                              • Support ignoring columns with database provided default value

                                If a database defines a default for a column then the column does not need to be mapped to a conceptual schema property anymore. The column is optional (like nullable columns) and the model should validate even if no mapping for the column is defined.

                                12 votes
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                                  1 comment  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                • Write EntitySet as XML like DataTable.WriteXML()

                                  Ability to save contents of a loaded entity set into an xml file to persist into hard disk then load again like is possible in data tables

                                  12 votes
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                                    0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                  • Improve Database First Support

                                    Code First is no match for real life situations and also Proxies create lot of runtime problems.

                                    We use Dictionary<Type,object> to store Lambda Expressions that are designed to act as Filters for one type. Here is the problem, at runtime code first entity type is a dynamic type leading to following problems.

                                    1. Dynamic Type implementation is hidden.
                                    2. It does not support INotifyPropertyChanged
                                    3. It does not allow us to inspect/validate property with partial methods which we were able to do with Database First (EDMX) Model.
                                    4. CreateSourceQuery is hidden, sometimes we want to only execute Any or inspect…

                                    12 votes
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                                      1 comment  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                    • Option to use Inner Join SQL when Eager Loading (AKA IncludeRequired method)

                                      When trying to load related entities using the "Include" eager loading feature of EF, it always generates SQL that uses an LEFT OUTER JOIN e.g.

                                      from m in Customer.Includes("Orders")

                                      will always generate the SQL:

                                      SELECT ......
                                      FROM Customers
                                      LEFT OUTER JOIN Orders....

                                      This is not always desirable, especially when you only want to retrieve Customers that have at least one or more related Orders. By forcing the generated SQL to always use LEFT OUTER JOIN, it's going to load all Customers regardless of whether they have related Orders or not. This can become extremely inefficient, especially when there are lots…

                                      11 votes
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                                        1 comment  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                      • code first support for view

                                        allow to define a view by code first.

                                        actually we can map an entity to a view but it then becomes nasty to:
                                        - generate the database,
                                        - migrate the database
                                        - evolve the schema in general

                                        It should be possible to:
                                        - declare a DbSet that does not involve a table creation
                                        - declare a view, with a linq query for example, that allows view creation.

                                        For DbSet if should be a convention: if table name starts with vvv then it is a view, do not create a table

                                        For view creation... no idea actually.

                                        11 votes
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                                          0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                        • Query serialization / deserialization

                                          ** SUGGESTION **
                                          Native support for query serialization and deserialization (to XML) decoupled from a concrete ObjectContext, including query parametrization and correct management of lambda expressions (e.g. using expression expansion as in LinqKit).

                                          ** WHY **
                                          We've developed a set of classes that allow a query to be written in the client layer and executed in the service layer via web services (with POCO entities). After the query is written normally using linq to entities and obtaining an IQueryable<T> object, this implementation transparently does the following:

                                          CLIENT side:
                                          - Expands the query expression tree to correctly manage lambda expressions.
                                          -…

                                          10 votes
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                                            0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
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