How to set the isolation level for Entity Framework CodeFirst Migrations

Question

If you run an entity framework migration (either automatic or explicit) against tables published for SQL Server replication you get the following error:

Answer 1

Would it help to create your onw Migrator?

internal sealed class Configuration : DbMigrationsConfiguration<SupplierEntities>
{
  public Configuration()
  {
    SetSqlGenerator("System.Data.SqlClient", new SqlMigrator());
  }

  private class SqlMigrator : SqlServerMigrationSqlGenerator
  {
    public override IEnumerable<MigrationStatement> Generate(
      IEnumerable<MigrationOperation> migrationOperations, string providerManifestToken)
    {
      yield return new MigrationStatement { Sql = "set transaction isolation level read committed" };
      foreach (var statement in base.Generate(migrationOperations, providerManifestToken))
        yield return statement;
    }
  }
}

Answer 2

You can write and execute SQL in your migration code:

Before SQL Server 2012 use dynamic SQL:

public override void Up()
{
     Sql("DECLARE @SQL NVARCHAR(4000) = 'ALTER DATABASE '+ DB_NAME() +' SET ALLOW_SNAPSHOT_ISOLATION ON' ; EXEC sp_executeSql @SQL;", true);
}

For SQL Server 2012 or later:

public override void Up()
{
     Sql("ALTER DATABASE CURRENT SET ALLOW_SNAPSHOT_ISOLATION ON",true);
}

Change "ALLOW_SNAPSHOT_ISOLATION" to your isolation level.