private static PhoneRecordNode Skip(PhoneRecordNode head, int skip)
{
var current = head;
var depth = 0;
while (current.next != null && depth < skip)
{
current = current.next;
depth++;
}
return(current);
}
private static IEnumerable <PhoneRecord> GetList(PhoneRecordNode head, int skip, int take)
{
var list = new List <PhoneRecord>();
if (head == null)
{
return(list);
}
var startingNode = Skip(head, skip);
list.AddRange(Take(startingNode, take));
return(list);
}
private static List <PhoneRecord> Take(PhoneRecordNode current, int take)
{
var list = new List <PhoneRecord>();
list.Add(current.record);
while (current.next != null && list.Count < take)
{
current = current.next;
list.Add(current.record);
}
return(list);
}
private static PhoneRecordNode AppendAlphabetically(PhoneRecordNode head, PhoneRecordNode node)
{
if (head == null || head.record == null)
{
head = node;
return(head);
}
PhoneRecordNode current = head;
if (string.CompareOrdinal(node.record.Name, current.record.Name) < 0)
{
node.next = current;
head = node;
return(head);
}
while (current.next != null && string.CompareOrdinal(node.record.Name, current.next.record.Name) > -1)
{
current = current.next;
}
node.next = current.next;
current.next = node;
return(head);
}
private static async Task UpdatePhoneBookAsync(string fileLocation, PhoneRecordNode phonebook)
{
using FileStream createStream = File.Create(fileLocation);
await JsonSerializer.SerializeAsync(createStream, phonebook, options);
}
