Entity Framework Feature Suggestions

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Entity Framework Feature Suggestions

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  1. Support unsigned integer (e.g. uint) properties and keys

    If my model contains an int ID it's automatically detected as a Key field.
    I'd like to have the same support for uint ID and similar types.

    12 votes
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      2 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
    • Columns' uniqueness awareness. (Unique Indexes)

      Several DataBases give you the possibility to create UNIQUE INDEXES, both to support Unique Constraint on it or just to ensure the uniqueness of some kind of data.

      In both cases, this kind of information doesn't have a proper place into the model and this makes the DbContext unable to determine the proper order of the Insert/Update/Delete commands within the commands tree.

      The reason is pretty clear to me, if within the same SaveChanges() you delete a row or you update a index column(s) value of a row and you add a brand new row with the same original index…

      12 votes
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        0 comments  ·  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 →
          • 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.

            11 votes
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              0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
            • Define RelatedProperty on an inherited foreign key

              Allow mapping to entity in a derived class based on a property in base class.

              Normally, we create a [RelatedTo] property for a foreign key defined in the same class.

              But it would be quite handy to be able to define [RelatedTo] on a Foreign Key defined in the base class.

              11 votes
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                0 comments  ·  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();

                10 votes
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                  0 comments  ·  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…

                  10 votes
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                    2 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                  • 10 votes
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                      0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                    • Better auditing interception

                      Together will all the fabulous features you are introducing I think it could be find room also for a sort of Audit System more business oriented.
                      We love the new Log & Interceptor hooks but we also need to pull out of the DbContext an easy POCO object based on 3 level of entities like this:

                      (S)avedChangset (1 instance for every SaveChanges() call with at least Time, User, Application & Session Info)
                      (E)ntities (a collection of the Entities changed within the same "Saved Changset" with at least TableName & PK)
                      (A)ttributes (a collection of Attributes changed within the same "Entity",…

                      10 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.

                        10 votes
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                          0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                        • System.Data.Entity.DbSet<TEntity>.Create() method overload for taking n parameters

                          The idea would be to overload Create() method on DbSet so as to take any parameters, resolving to the constructor tha best fits, like so

                          public TEntity Create(params object[] args);

                          (I understand the generated proxy for change tracking and nivigational properties support should honor all constructors defined on the TEntity type)

                          This would allow for a much cleaner (and layarable) DomainModel. Entities may now be created from required values and the need to set those values (i.e. the need for public setters) after the creation dissapears.

                          10 votes
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                            0 comments  ·  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…

                            9 votes
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                              1 comment  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                            • Use multiple result sets to handle Include statements

                              Currently, EF uses a flat query in order to populate navigation property values when using eager loading via the Include statement. While this is acceptable in some (perhaps many) cases, there are a lot of cases where this produces unacceptable queries, whether from a size or performance perspective.

                              While this performance bottleneck can be partially avoided by using LoadProperty, this is

                              a) less expressive and more verbose
                              b) potentially more expensive, as it requires a round-trip for every property on every entity

                              Instead, please allow us the option of having EF generate multiple SELECT statements to address each navigation property

                              9 votes
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                                2 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                              • Support for generic complex types

                                You should support for using generic complex types. Consider scenerio where I would like to create Rage<T> type. Now I must create RangeOfInt32, RangeOfInt64, RangeOfDecimal, etc. It will be also great if that class could be defined outside of the model.

                                9 votes
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                                  0 comments  ·  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…

                                  8 votes
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                                    0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                  • Support Pessimistic Concurrency

                                    Allow a Select with UpdLock which locks all returned entities in the Database. This is a basic requirement to program for example a ticket sales portal with entity framework! So far it's not possible and I still have to stick to NHibernate :(

                                    8 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.

                                      8 votes
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                                        1 comment  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                      • Support for .Contains(Entity)

                                        Be able to write code like "if (Context.Table.Contains(entity))"

                                        8 votes
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                                          3 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                        • Navigation properties in composite ids without need for the corresponding scaler property

                                          If you have a class like

                                          public class CustomerAddress
                                          {
                                          public virtual Customer Customer { get; set; }
                                          public virtual Address Address { get; set; }
                                          public virtual string AddressType { get; set; }
                                          public virtual DateTime ModifiedDate { get; set; }
                                          }

                                          you should be able to create a composite id like this

                                          HasKey(a => new { a.Customer, a.Address });

                                          without defining CustomerId and AddressId properties

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