Use the Add-Migration command to create a new migration. That discover types that implement the interface. Use EF Core migration flow to apply changes from models to the database. How arguments can be passed to this method via the various design-time tools 9 Answers Sorted by: 63 It looks like there are several classes that have been inherited from DbContext class (may have come from some NuGet package). Parameter on the CreateDbContext method is not currently It should be noted at this stage that the string args Return new SampleContext(optionsBuilder.Options) įinally, you must ensure that your context has a constructor that takes aĭbContextOptions object as a parameter: public SampleContext(DbContextOptions options) : base (options) Opts => opts.CommandTimeout(( int )TimeSpan.FromMinutes(10).TotalSeconds) Public SampleContext CreateDbContext( string args) Specified for the runtime version of the context: public class SampleContextFactory : IDesignTimeDbContextFactory EF Core has migrations as a way of restoring the database structure inherited from Entity Framework and for the most of the cases all you have to do to. Minutes, as opposed to the default 30 seconds, or whatever value has been Migrations Overview - EF Core Microsoft Learn Entity Framework Tutorial > Add your first. Override the creation of SampleContext, specifying a command timeout value of 10 Run the Enable-Migrations command in Package Manager Console. The following example illustrates the use of IDesignTimeDbContextFactory to As such, it provides a hook for overriding the construction of You to configure the context in a different manner to the way it is configuredįor runtime use. Tools Add-Migration InitialCreate Update-Database The first command. If one exists, it is instantiated and its CreateDbContext method is called which returns the derived EF Core supports a code-first approach, which means that you can start by defining. The tools are configured to search the assembly containing theĭbContext (or the one designated as the startup assembly) for a type that This interface is only intended for use with design time tools such as This (and other) problems associated with configuring DbContext objectsĭifferently for certain design-time tasks, such as migrations. The IDesignTimeDbContextFactory was introduced in EF Core 2.0 to alleviate The full range of commands can be found by typing get-help entityframework at the PM prompt: PM> get-help entityframework /\ -/ \\. Prior to version 2.0 of EF Core, your options were limited to changing the command timeout for the DbContext, running the migration and then resetting the timeout value (or not): public SampleContext()ĭatabase.SetCommandTimeout(( int )TimeSpan.FromMinutes(5).TotalSeconds) The commands that you execute to manage migrations from the Package Manager Console are largely the same as those for Entity Framework 6.
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