Arthur Vickers

icon location Walpole St Peter icon location Neuroscientist; programmer. Former Microsoft. Co-creator of EF Core.

Results 1127 comments of Arthur Vickers

The instance of entity type 'XXXX' cannot be tracked because another instance with the key value 'XXX' is already being tracked. When attaching existing entities, ensure that only one entity instance with a given key value is attached.

@luisf350 The code creates a single instance of your `DbContext` type in `MainWindowViewModel` and then uses this for evermore. Instead, create a new context instance for each unit-of-work.

The instance of entity type 'XXXX' cannot be tracked because another instance with the key value 'XXX' is already being tracked. When attaching existing entities, ensure that only one entity instance with a given key value is attached.

@luisf350 The way you are using D.I. means that, as far as I can tell, you will never get more than one `DbContext` instance, because it is only (indirectly) requested...

The instance of entity type 'XXXX' cannot be tracked because another instance with the key value 'XXX' is already being tracked. When attaching existing entities, ensure that only one entity instance with a given key value is attached.

@luisf350 It's hard to say because you know what your intention is. All I would say is that, if you are going to do a repository, with or without D.I.,...

Discriminator columns are created in Snapshot for wrongly configured TPC mapping strategy

Still repros on latest; regression from 7.

The Elapsed property for CommandExecuted event is defined as string in the logs.

@dotnet/efteam Does anyone remember if there is a reason we are using all strings here?

Improve CheckContextConstructors method in EntityFrameworkServiceCollectionExtensions

@michaeltg17 This is by-design. EF Core cannot know whether or not the parameter or parameters that are passed to the constructor will resolve a `DbContextOptions` or not. Just because the...

Option to enable `DECLARE @x AS type = value` style logging of parameter values

Duplicate of #19756

EFCore 8: DbContext (StateManager) adds back previously detached entities

Note for team: confirmed bug when iterating over tracked entities and detaching them. Note that this is typically anti-pattern. It is being done here because some other state is being...

"No store type was specified for the decimal property" warning with `HasConversion<string>()` specified for property when creating a new migration

Related to #27438

No suitable constructor was found for entity type 'CollectionEntry'

@RDoser Your projects are pulling .NET Framework assemblies into a .NET Core app. This is not supported.