using (var connection = new SqlConnection("connectionString"))
{
    connection.Open();

    using (var command = new SqlCommand("SELECT time_column FROM table_name", connection))
    {
        using (var reader = command.ExecuteReader())
        {
            while (reader.Read())
            {
                // 假设 time_column 是 DbType.Time 类型的列
                int timeColumnIndex = reader.GetOrdinal("time_column");

                // 将 DbType.Time 类型的值转换为 TimeSpan 对象
                TimeSpan timeSpan = reader.GetTimeSpan(timeColumnIndex);

                // 使用转换后的 TimeSpan 对象进行后续操作
            }
        }
    }
}