在运行EF 6迁移之前，是否可以将现有数据库放入单个用户？

Question

在迁移之前，有没有办法将现有数据库置于单用户模式？

我想做类似以下的事情，虽然这不起作用：

        var connectionString = "";// Connection string pointing to MASTER database on server

        var sqlConnection = new SqlConnection();

        sqlConnection.Open();

        ExecuteNonQuery(
            sqlConnection,
            "USE MASTER");

        ExecuteNonQuery(
            sqlConnection,
            $"ALTER DATABASE [TargetDatabaseToMigrate] SET AUTO_UPDATE_STATISTICS_ASYNC OFF");

        ExecuteNonQuery(
            sqlConnection,
            $"ALTER DATABASE [TargetDatabaseToMigrate] SET SINGLE_USER WITH ROLLBACK IMMEDIATE");

        TargetDatabaseContext ctx = new TargetDatabaseContext(sqlConnection, false);
        if(!ctx.Database.CompatibleWithModel(true))
        {
            var migrator = new MigrateDatabaseToLatestVersion<TargetDatabaseContext, Migrations.Configuration>(true);
            migrator.InitializeDatabase(ctx);
        }

        ExecuteNonQuery(
            sqlConnection,
            $"ALTER DATABASE [TargetDatabaseToMigrate] SET MULTI_USER");

        ExecuteNonQuery(
            sqlConnection,
            $"ALTER DATABASE [TargetDatabaseToMigrate] SET AUTO_UPDATE_STATISTICS_ASYNC ON");

我查看了EF代码，似乎没有代码路径使用传入的现有连接。所有代码路径似乎都使用连接信息来创建新连接。

例如，这是我的代码在EF中首次失败的地方：

   internal override void EnsureDatabaseExists(Action mustSucceedToKeepDatabase)
    {
        var databaseCreated = false;
        var databaseCreator = new DatabaseCreator(_configuration.CommandTimeout);

        {
            DbConnection connection = null;

        try
        {
            connection = CreateConnection();

除了：

throw new InvalidOperationException(Strings.SqlProvider_CredentialsMissingForMasterConnection, e);

有没有办法实现这个目标？谢谢。