如何在可取消的 async/await 中处理 TransactionScope?

"A TransactionScope must be disposed on the same thread that it was created."

public void TestTx () {
    var cancellation = new CancellationTokenSource ();
    var task = TestTxAsync ( cancellation.Token );
    cancellation.Cancel ();
    task.Wait ();
}

private async Task TestTxAsync ( CancellationToken cancellationToken ) {
    using ( var scope = new TransactionScope () ) {
        using ( var connection = new SqlConnection ( m_ConnectionString ) ) {
            await connection.OpenAsync ( cancellationToken );
            //using ( var command = new SqlCommand ( ... , connection ) ) {
            //  await command.ExecuteReaderAsync ();
            //  ...
            /
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