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Meme engine 2 3 – create your own memes. The following list includes the major new features in EF Core 5.0. For the full list of issues in the release, see our issue tracker.

As a major release, EF Core 5.0 also contains several breaking changes, which are API improvements or behavioral changes that may have negative impact on existing applications.

Many-to-many

EF Core 5.0 supports many-to-many relationships without explicitly mapping the join table.

For example, consider these entity types:

EF Core 5.0 recognizes this as a many-to-many relationship by convention, and automatically creates a PostTag join table in the database. Data can be queried and updated without explicitly referencing the join table, considerably simplifying code. The join table can still be customized and queried explicitly if needed.

For further information, see the full documentation on many-to-many.

Split queries

Starting with EF Core 3.0, EF Core always generates a single SQL query for each LINQ query. This ensures consistency of the data returned within the constraints of the transaction mode in use. However, this can become very slow when the query uses Include or a projection to bring back multiple related collections.

EF Core 5.0 now allows a single LINQ query including related collections to be split into multiple SQL queries. This can significantly improve performance, but can result in inconsistency in the results returned if the data changes between the two queries. Serializable or snapshot transactions can be used to mitigate this and achieve consistency with split queries, but that may bring other performance costs and behavioral difference.

For example, consider a query that pulls in two levels of related collections using Include:

By default, EF Core will generate the following SQL when using the SQLite provider:

With split queries, the following SQL is generated instead:

Split queries can be enabled by placing the new AsSplitQuery operator anywhere in your LINQ query, or globally in your model's OnConfiguring. For further information, see the full documentation on split queries.

Simple logging and improved diagnostics

EF Core 5.0 introduces a simple way to set up logging via the new LogTo method. The following will cause logging messages to be written to the console, including all SQL generated by EF Core:

In addition, it is now possible to call ToQueryString on any LINQ query, retrieving the SQL that the query would execute:

Finally, various EF Core types have been fitted with an enhanced DebugView property which provides a detailed view into the internals. For example, ChangeTracker.DebugView can be consulted to see exactly which entities are being tracked in a given moment.

For further information, see the documentation on logging and interception.

Filtered include

The Include method now supports filtering of the entities included:

This query will return blogs together with each associated post, but only when the post title contains 'Cheese'.

For further information, see the full documentation on split queries.

Table-per-type (TPT) mapping

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By default, EF Core maps an inheritance hierarchy of .NET types to a single database table. This is known as table-per-hierarchy (TPH) mapping. EF Core 5.0 also allows mapping each .NET type in an inheritance hierarchy to a different database table; known as table-per-type (TPT) mapping.

For example, consider this model with a mapped hierarchy:

Cookie 5 5 8 4. With TPT, a database table is created for each type in the hierarchy:

For further information, see the full documentation on TPT. Windynamicdesktop catalina.

Flexible entity mapping

Entity types are commonly mapped to tables or views such that EF Core will pull back the contents of the table or view when querying for that type. EF Core 5.0 adds additional mapping options, where an entity can be mapped to a SQL query (called a 'defining query'), or to a table-valued function (TVF):

Table-valued functions can also be mapped to a .NET method rather than to a DbSet, allowing parameters to be passed; the mapping can be set up with HasDbFunction.

Finally, it is now possible to map an entity to a view when querying (or to a function or defining query), but to a table when updating:

Shared-type entity types and property bags

EF Core 5.0 allows the same CLR type to be mapped to multiple different entity types; such types are known as shared-type entity types. While any CLR type can be used with this feature, .NET Dictionary offers a particularly compelling use-case which we call 'property bags':

These entities can then be queried and updated just like normal entity types with their own, dedicated CLR type. More information can be found in the documentation on property bags.

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Required 1:1 dependents

In EF Core 3.1, the dependent end of a one-to-one relationship was always considered optional. This was most apparent when using owned entities, as all the owned entity's column were created as nullable in the database, even if they were configured as required in the model.

In EF Core 5.0, a navigation to an owned entity can be configured as as a required dependent. For example:

DbContextFactory

EF Core 5.0 introduces AddDbContextFactory and AddPooledDbContextFactory to register a factory for creating DbContext instances in the application's dependency injection (D.I.) container; this can be useful when application code needs to create and dispose context instances manually.

At this point, application services such as ASP.NET Core controllers can then be injected with IDbContextFactory, and use it to instantiate context instances:

For further information, see the full documentation on DbContextFactory.

SQLite table rebuilds

Compared to other databases, SQLite is relatively limited in its schema manipulation capabilities; for example, dropping a column from an existing table is not supported. EF Core 5.0 works around these limitations by automatically creating a new table, copying the data from the old table, dropping the old table and renaming the new one. This 'rebuilds' the table, and allows previously unsupported migration operations to be safely applied.

For details on which migration operations are now supported via table rebuilds, see this documentation page.

Database collations

EF Core 5.0 introduces support for specifying text collations at the database, column or query level. This allows case sensitivity and other textual aspects to be configured in a way that is both flexible and does not compromise query performance.

For example, the following will configure the Name column to be case-sensitive on SQL Server, and any indexes created on the column will function accordingly:

For further information, see the full documentation on collations and case sensitivity.

Event counters

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EF Core 5.0 exposes event counters which can be used to track your application's performance and spot various anomalies. Simply attach to a process running EF with the dotnet-counters tool:

For further information, see the full documentation on event counters.

Other features

Model building

• Model building APIs have been introduced for easier configuration of value comparers.
• Computed columns can now be configured as stored or virtual.
• Precision and scale can now be configured via the Fluent API.
• New model building APIs have been introduced for navigation properties.
• New model building APIs have been introduced for fields, similar to properties.
• The .NET PhysicalAddress and IPAddress types can now be mapped to database string columns.
• A backing field can now be configured via the new [BackingField] attribute.
• Nullable backing fields are now allowed, providing better support for store-generated defaults where the CLR default isn't a good sentinel value (notable bool).
• A new [Index] attribute can be used on an entity type to specify an index, instead of using the Fluent API.
• A new [Keyless] attribute can be used to configure an entity type as having no key.
• By default, EF Core now regards discriminators as complete, meaning that it expects to never see discriminator values not configured by the application in the model. This allows for some performance improvements, and can be disabled if your discriminator column might hold unknown values.

Query

• Query translation failure exceptions now contain more explicit reasons about the reasons for the failure, to help pinpoint the issue.
• No-tracking queries can now perform identity resolution, avoiding multiple entity instances being returned for the same database object.
• Added support for GroupBy with conditional aggregates (e.g. GroupBy(o => o.OrderDate).Select(g => g.Count(i => i.OrderDate != null))).
• Added support for translating the Distinct operator over group elements before aggregate.
• Translation of Reverse.
• Improved translation around DateTime for SQL Server (e.g. DateDiffWeek, DateFromParts).
• Translation of new methods on byte arrays (e.g. Contains, Length, SequenceEqual).
• Translation of some additional bitwise operators, such as two's complement.
• Translation of FirstOrDefault over strings.
• Improved query translation around null semantics, resulting in tighter, more efficient queries.
• User-mapped functions can now be annotated to control null propagation, again resulting in tighter, more efficient queries.
• SQL containing CASE blocks is now considerably more concise.
• The SQL Server DATELENGTH function can now be called in queries via the new EF.Functions.DataLength method.
• EnableDetailedErrors adds additional details to exceptions.

Saving

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• SaveChanges interception and events.
• APIs have been introduced for controlling transaction savepoints. In addition, EF Core will automatically create a savepoint when SaveChanges is called and a transaction is already in progress, and roll back to it in case of failure.
• A transaction ID can be explicitly set by the application, allowing for easier correlation of transaction events in logging and elsewhere.
• The default maximum batch size for SQL Server has been changed to 42 based on an analysis of batching performance.

Migrations and scaffolding

• Tables can now be excluded from migrations.
• A new dotnet ef migrations list command now shows which migrations have not yet been applied to the database (Get-Migration does the same in the Package Management Console).
• Migrations scripts now contain transaction statements where appropriate to improve handling cases where migration application fails.
• The columns for unmapped base classes are now ordered after other columns for mapped entity types. Note this only impacts newly created tables; the column order for existing tables remains unchanged.
• Migration generation can now be aware if the migration being generated is idempotent, and whether the output will be executed immediately or generated as a script.
• New command-line parameters have been added for specifying namespaces in Migrations and scaffolding.
• The dotnet ef database update command now accepts a new --connection parameter for specifying the connection string.
• Scaffolding existing databases now singularizes table names, so tables named People and Addresses will be scaffolded to entity types called Person and Address. Original database names can still be preserved.
• The new --no-onconfiguring option can instruct EF Core to exclude OnModelConfiguring when scaffolding a model.

For further information, see the full documentation on collations and case sensitivity.

Event counters

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EF Core 5.0 exposes event counters which can be used to track your application's performance and spot various anomalies. Simply attach to a process running EF with the dotnet-counters tool:

For further information, see the full documentation on event counters.

Other features

Model building

• Model building APIs have been introduced for easier configuration of value comparers.
• Computed columns can now be configured as stored or virtual.
• Precision and scale can now be configured via the Fluent API.
• New model building APIs have been introduced for navigation properties.
• New model building APIs have been introduced for fields, similar to properties.
• The .NET PhysicalAddress and IPAddress types can now be mapped to database string columns.
• A backing field can now be configured via the new [BackingField] attribute.
• Nullable backing fields are now allowed, providing better support for store-generated defaults where the CLR default isn't a good sentinel value (notable bool).
• A new [Index] attribute can be used on an entity type to specify an index, instead of using the Fluent API.
• A new [Keyless] attribute can be used to configure an entity type as having no key.
• By default, EF Core now regards discriminators as complete, meaning that it expects to never see discriminator values not configured by the application in the model. This allows for some performance improvements, and can be disabled if your discriminator column might hold unknown values.

Query

• Query translation failure exceptions now contain more explicit reasons about the reasons for the failure, to help pinpoint the issue.
• No-tracking queries can now perform identity resolution, avoiding multiple entity instances being returned for the same database object.
• Added support for GroupBy with conditional aggregates (e.g. GroupBy(o => o.OrderDate).Select(g => g.Count(i => i.OrderDate != null))).
• Added support for translating the Distinct operator over group elements before aggregate.
• Translation of Reverse.
• Improved translation around DateTime for SQL Server (e.g. DateDiffWeek, DateFromParts).
• Translation of new methods on byte arrays (e.g. Contains, Length, SequenceEqual).
• Translation of some additional bitwise operators, such as two's complement.
• Translation of FirstOrDefault over strings.
• Improved query translation around null semantics, resulting in tighter, more efficient queries.
• User-mapped functions can now be annotated to control null propagation, again resulting in tighter, more efficient queries.
• SQL containing CASE blocks is now considerably more concise.
• The SQL Server DATELENGTH function can now be called in queries via the new EF.Functions.DataLength method.
• EnableDetailedErrors adds additional details to exceptions.

Saving

Translate Translator To Spanish

• SaveChanges interception and events.
• APIs have been introduced for controlling transaction savepoints. In addition, EF Core will automatically create a savepoint when SaveChanges is called and a transaction is already in progress, and roll back to it in case of failure.
• A transaction ID can be explicitly set by the application, allowing for easier correlation of transaction events in logging and elsewhere.
• The default maximum batch size for SQL Server has been changed to 42 based on an analysis of batching performance.

Migrations and scaffolding

• Tables can now be excluded from migrations.
• A new dotnet ef migrations list command now shows which migrations have not yet been applied to the database (Get-Migration does the same in the Package Management Console).
• Migrations scripts now contain transaction statements where appropriate to improve handling cases where migration application fails.
• The columns for unmapped base classes are now ordered after other columns for mapped entity types. Note this only impacts newly created tables; the column order for existing tables remains unchanged.
• Migration generation can now be aware if the migration being generated is idempotent, and whether the output will be executed immediately or generated as a script.
• New command-line parameters have been added for specifying namespaces in Migrations and scaffolding.
• The dotnet ef database update command now accepts a new --connection parameter for specifying the connection string.
• Scaffolding existing databases now singularizes table names, so tables named People and Addresses will be scaffolded to entity types called Person and Address. Original database names can still be preserved.
• The new --no-onconfiguring option can instruct EF Core to exclude OnModelConfiguring when scaffolding a model.

Cosmos

• Cosmos connection settings have been expanded.
• Optimistic concurrency is now supported on Cosmos via the use of ETags.
• The new WithPartitionKey method allows the Cosmos partition key to be included both in the model and in queries.
• The string methods Contains, StartsWith and EndsWith are now translated for Cosmos.
• The C# is operator is now translated on Cosmos.

Sqlite

• Computed columns are now supported.
• Retrieving binary and string data with GetBytes, GetChars, and GetTextReader is now more efficient by making use of SqliteBlob and streams.
• Initialization of SqliteConnection is now lazy.

Other

• Change-tracking proxies can be generated that automatically implement INotifyPropertyChanging and INotifyPropertyChanged. This provides an alternative approach to change-tracking that doesn't scan for changes when SaveChanges is called.
• A DbConnection or connection string can now be changed on an already-initialized DbContext.
• The new ChangeTracker.Clear.0#Microsoft_EntityFrameworkCore_ChangeTracking_ChangeTracker_Clear) method clears the DbContext of all tracked entities. This should usually not be needed when using the best practice of creating a new, short-lived context instance for each unit-of-work. However, if there is a need to reset the state of a DbContext instance, then using the new Clear() method is more efficient and robust than mass-detaching all entities.
• The EF Core command line tools now automatically configure the ASPNETCORE_ENVIRONMENTandDOTNET_ENVIRONMENT environment variables to 'Development'. This brings the experience when using the generic host in line with the experience for ASP.NET Core during development.
• Custom command-line arguments can be flowed into IDesignTimeDbContextFactory, allowing applications to control how the context is created and initialized.
• The index fill factor can now be configured on SQL Server.
• The new IsRelational property can be used to distinguish when using a relational provider and a non-relation provider (such as InMemory).