Singly linked list

LinkedList_Single.cs

using System;

namespace ConsoleApp1
{
    public class Program
    {
        private static SingleLinkedList<int> singleLinkedList;
        static void Main(string[] args)
        {
            singleLinkedList = new SingleLinkedList<int>();

            // Insert
            singleLinkedList.InsertNode(10);
            singleLinkedList.InsertNode(20);
            singleLinkedList.InsertNode(5, false);
            singleLinkedList.InsertNode(15, 2);
            singleLinkedList.InsertNode(30);
            singleLinkedList.InsertNode(30);
            singleLinkedList.InsertNode(30);

            // Add Fail Case
            singleLinkedList.InsertNode(100, 9);

            // Remove
            singleLinkedList.RemoveNode(20);
            singleLinkedList.RemoveNode(30, true);
            singleLinkedList.RemoveAt(1);
            singleLinkedList.RemoveAt(100);

            singleLinkedList.PrintNode();
        }
    }

    public class SingleLinkedList<T>
    {
        public class Node<T>
        {
            public Node() { }
            public Node(T newData)
            {
                data = newData;
            }

            public T data;
            public Node<T> next;
        }

        private Node<T> head;
        private Node<T> tail;

        public SingleLinkedList()
        {
            // 먼저 머리와 꼬리 노드를 만들어준다. ㅁ(head) -> ㅁ(tail)
            head = new Node<T>();
            tail = new Node<T>();

            // (head) -> tail
            head.next = tail;
            // (tail) -> NULL
            tail.next = null;
        }

        /// <summary>
        /// 맨 앞이나 맨 뒤에 Data를 삽입한다.
        /// </summary>
        /// <param name="newData"> 새로 넣을 데이터 </param>
        /// <param name="addTail"> 꼬리에 추가할 것인지 </param>
        public int InsertNode(T newData, bool addTail = true)
        {
            var count = 0;
            var addNode = new Node<T>(newData);
            var tempNode = head;

            if (addTail)
            {
                while (tempNode.next != tail)
                {
                    tempNode = tempNode.next;
                    ++count;
                }
            }

            addNode.next = tempNode.next;
            tempNode.next = addNode;

            return count;
        }

        /// <summary>
        /// 원하는 index에 Data를 추가한다.
        /// </summary>
        /// <param name="newData"></param>
        /// <param name="index"></param>
        /// <returns></returns>
        public int InsertNode(T newData, int index)
        {
            var count = 0;
            var addNode = new Node<T>(newData);
            var tempNode = head;

            for (var i = 0; i < index; ++i)
            {
                if (tempNode == tail)
                {
                    Console.WriteLine("Add Fail..");
                    return 0;
                }

                tempNode = tempNode.next;
                ++count;
            }

            addNode.next = tempNode.next;
            tempNode.next = addNode;

            return count;
        }

        /// <summary>
        /// 해당 데이터를 만나면 해당 노드를 삭제한다.
        /// </summary>
        /// <param name="removeNode"></param>
        public int RemoveNode(T removeData, bool matchRemoveAll = false)
        {
            var count = 0;
            var deleteNode = head;
            var deletePrevNode = head;

            while (deleteNode != tail)
            {
                // 지우려는 데이터가 같다면
                if (deleteNode.data.Equals(removeData))
                {
                    deletePrevNode.next = deleteNode.next;
                    deleteNode = null;

                    if (matchRemoveAll)
                    {
                        count += RemoveNode(removeData, matchRemoveAll);
                        break;
                    }
                    else
                        break;
                }

                deletePrevNode = deleteNode;
                deleteNode = deleteNode.next;
                ++count;
            }
            return count;
        }

        public int RemoveAt(int index)
        {
            var count = 0;
            var deleteNode = head.next;
            var deletePrevNode = head;

            for (var i = 0; i < index; ++i)
            {
                if (deleteNode == tail)
                {
                    Console.WriteLine("delete Fail..");
                    return count;
                }

                deletePrevNode = deleteNode;
                deleteNode = deleteNode.next;
            }

            deletePrevNode.next = deleteNode.next;
            deleteNode = null;

            return count;
        }

        public void PrintNode()
        {
            Console.Write("HEAD->");
            for (var tempNode = head.next; tempNode != tail; tempNode = tempNode.next)
            {
                Console.Write(tempNode.data + "->");
            }
            Console.WriteLine("TAIL");
        }

    }
}