Add --connection and --offline parameters to migrations remove and database drop commands

[Copilot]

Fixes #24271

EF Core CLI commands migrations remove and database drop now accept connection strings as parameters, eliminating the need to configure default connections in DbContext for these operations.

Changes

New Parameters:

• dotnet ef migrations remove --connection <CONNECTION> - specify connection string for migration removal
• dotnet ef migrations remove --offline - remove migration without connecting to the database
• dotnet ef migrations remove --force - revert the migration if it has been applied to the database
• dotnet ef database drop --connection <CONNECTION> - specify connection string for database drop

PMC Commands:

• Remove-Migration -Connection <CONNECTION> - specify connection string for migration removal
• Remove-Migration -Offline - remove migration without connecting to the database
• Remove-Migration -Force - revert the migration if it has been applied to the database
• Drop-Database -Connection <CONNECTION> - specify connection string for database drop

Implementation:

• Extended MigrationsRemoveCommand and DatabaseDropCommand to accept connection parameters
• Updated IOperationExecutor interface and implementations to propagate connection strings and offline flag
• Modified MigrationsOperations.RemoveMigration() and DbContextOperations.DropDatabase() to apply connection strings via context.Database.SetConnectionString()
• Updated IMigrationsScaffolder and MigrationsScaffolder to handle offline mode by skipping database connection entirely
• Added corresponding PMC command support in EntityFrameworkCore.psm1

Usage

# Remove migration with specific connection
dotnet ef migrations remove --connection "Server=prod;Database=MyDb;..."

# Remove migration without connecting to database (offline mode)
dotnet ef migrations remove --offline

# Revert and remove applied migration
dotnet ef migrations remove --force

# Drop specific database by connection string
dotnet ef database drop --connection "Server=test;Database=MyDb;..." --force

Behavior

• --offline: Skips the database connection check entirely. Useful when the database is inaccessible or when you're certain the migration hasn't been applied.
• --force: Connects to the database to check if the migration has been applied. If it has, reverts the migration before removing the files.
• Validation: The --offline and --force options cannot be used together, as offline mode prevents the database check required for force revert.

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[AndriySvyryd]

@copilot You need to update the PMC commands in EntityFrameworkCore.psm1

[Copilot]

@copilot You need to update the PMC commands in EntityFrameworkCore.psm1

Fixed in 8dfe8d0. Updated Remove-Migration to support -Connection and -Offline parameters, and Drop-Database to support -Connection parameter.

[Copilot]

Pull request overview

This PR extends EF Core tooling (CLI + PMC) so migrations remove and database drop can accept an explicit connection string, and so migrations remove can run in an offline mode that skips database connectivity checks.

Changes:

• Added --connection to dotnet ef migrations remove and dotnet ef database drop, plus --offline to dotnet ef migrations remove.
• Propagated connectionString/offline through the operation executor pipeline and applied it in MigrationsOperations/DbContextOperations.
• Added offline support in MigrationsScaffolder.RemoveMigration by skipping the applied-migration check when requested, and updated PMC cmdlets to pass the new flags.

Reviewed changes

Copilot reviewed 14 out of 16 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
src/ef/Properties/Resources.resx	Adds localized description for --offline option (ef command resources).
src/ef/Properties/Resources.Designer.cs	Adds strongly-typed resource accessor for the new offline description.
src/ef/OperationExecutorBase.cs	Extends operation invocation args for remove-migration and drop-database to include offline/connection string.
src/ef/IOperationExecutor.cs	Updates executor interface to accept offline/connection string for remove-migration and connection string for drop-database.
src/ef/Commands/MigrationsRemoveCommand.cs	Passes --offline/--connection through to the executor.
src/ef/Commands/MigrationsRemoveCommand.Configure.cs	Defines --offline and --connection options for migrations remove.
src/ef/Commands/DatabaseDropCommand.cs	Passes --connection through to the executor for database drop.
src/ef/Commands/DatabaseDropCommand.Configure.cs	Defines --connection option for database drop.
src/dotnet-ef/Properties/Resources.resx	Adds localized description for --offline option (dotnet-ef resources).
src/dotnet-ef/Properties/Resources.Designer.cs	Adds strongly-typed resource accessor for the new offline description.
src/EFCore.Tools/tools/EntityFrameworkCore.psm1	Adds -Connection for Drop-Database and -Offline/-Connection for Remove-Migration PMC cmdlets.
src/EFCore.Design/Migrations/Design/MigrationsScaffolder.cs	Implements offline removal by skipping the applied-migration DB query when requested.
src/EFCore.Design/Migrations/Design/IMigrationsScaffolder.cs	Adds an offline parameter to the public scaffolder interface remove method.
src/EFCore.Design/Design/OperationExecutor.cs	Plumbs offline and connectionString args into the design-time operations for remove-migration and drop-database.
src/EFCore.Design/Design/Internal/MigrationsOperations.cs	Applies SetConnectionString(...) and passes offline through to the scaffolder.
src/EFCore.Design/Design/Internal/DbContextOperations.cs	Applies SetConnectionString(...) before dropping the database.

Files not reviewed (2)

• src/dotnet-ef/Properties/Resources.Designer.cs: Language not supported
• src/ef/Properties/Resources.Designer.cs: Language not supported

[AndriySvyryd]

@copilot Revert the PR description to say what the PR does overall, not what was done in the latest commits

[Copilot]

@copilot Revert the PR description to say what the PR does overall, not what was done in the latest commits

Updated PR description to provide a high-level overview of the feature rather than a checklist of incremental changes.