使用EF6为SQLite数据库填充新数据，迁移配置失败求助

Hey there, let’s walk through figuring out why your custom ContextMigrationConfiguration isn’t working, since you’ve confirmed the core example from the sqliteef6migrations library runs fine.

First, let’s keep the working example handy for reference:

internal sealed class ContextMigrationConfiguration : DbMigrationsConfiguration<Context> 
{ 
    public ContextMigrationConfiguration() 
    { 
        AutomaticMigrationsEnabled = true; 
        AutomaticMigrationDataLossAllowed = true; 
        SetSqlGenerator("System.Data.SQLite", new SQLiteMigrationSqlGenerator()); 
    } 
}

Here are the most common fixes to check when your own setup fails:

• Double-check your DbContext setup
  Make sure your Context class has a valid connection string pointing to your SQLite database, and that the connection string uses the System.Data.SQLite provider name (matching what you pass to SetSqlGenerator). If the context can’t connect or uses the wrong provider, migrations will fail before they even start.

• Confirm all NuGet packages are installed and up-to-date
  You’ll need:

  • System.Data.SQLite and System.Data.SQLite.EF6
  • The sqliteef6migrations library itself
    Mismatched versions or missing packages are a frequent culprit here—even a minor version mismatch between SQLite EF6 and the migrations library can break things.

• Make sure your configuration is being used
  If you’re using the Package Manager Console, don’t rely on EF picking the right configuration automatically. Specify it explicitly with:

  Update-Database -ConfigurationTypeName YourProjectNamespace.ContextMigrationConfiguration
  

  For programmatic migrations, ensure you’re passing your configuration to DbMigrator:

  var migrator = new DbMigrator(new YourCustomMigrationConfiguration());
  migrator.Update();
  

• Check for conflicting configurations
  If there are multiple DbMigrationsConfiguration classes in your project targeting different contexts (or even the same one), EF might be picking the wrong one. Mark your custom class as sealed (like the example) and ensure it’s the only configuration tied to your Context type.

• Enable verbose logging to see what’s breaking
  Add logging to your configuration constructor to get detailed error messages:

  this.LogTo = message => System.Diagnostics.Debug.WriteLine(message);
  

  Then check the Visual Studio Output window—this will show you exactly where the migration process is failing, whether it’s a provider registration issue, a missing table, or something else.

• Validate the SQLiteMigrationSqlGenerator instance
  Ensure you’re instantiating SQLiteMigrationSqlGenerator correctly. If the library requires any custom setup (like overriding specific SQL generation methods), make sure you haven’t skipped that in your custom configuration.

If you can share the exact error message you’re getting (from the console or logs), that’ll help zero in on the problem even faster—small details like a missing provider or invalid connection string are often hidden in those messages.

内容的提问来源于stack exchange，提问作者Alexei Agüero Alba