測試鏈式儲存類linkedstructure

Code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;
using System.Collections.Specialized;
using System.Threading;

using System.Reflection;
using System.Data;

namespace TestArray
{
    class Program
    {
        /// <summary>
        /// 測試鏈式儲存類linkedstructure
        /// </summary>
        /// <param name="args"></param>
        static void Main(string[] args)
        {
            string s1 = "red";
            string s2 = "blue";
            string s3 = "yellow";

            LinkedStructure<string> l = new LinkedStructure<string>();
            l.addData(new LinkedNode<string>(s1));
            l.addData(new LinkedNode<string>(s2));
            l.addData(new LinkedNode<string>(s3));
            l.displayData();

            Console.ReadLine();
        }
    }

    //資料元素儲存表示
    class LinkedNode<T>
    {
        T data;
        LinkedNode<T> next;//通過引用將隨機存放的元素連結起來

        public LinkedNode(T val)
        {
            data = val;
            next = null;
        }

        public T Data
        {
            get { return data; }
            set { data = value; }
        }

        public LinkedNode<T> Next
        {
            get { return next; }
            set { next = value; }
        } 
    }

    
    //資料元素關係的儲存表示及演算法實現
    class LinkedStructure<T>
    {
        LinkedNode<T> first;
        LinkedNode<T> current;

        public LinkedStructure()
        {
            first = null;
        }

        public void addData(LinkedNode<T> var)
        {
            if (first == null)
            {
                first = var;
                current = var;
                return;
            }
            else
            {
                current.Next = var;
                current = var;
            }
        }

        public void displayData()
        {
            current = first;
            while (current != null)
            {
                Console.Write(current.Data + "");
                current = current.Next;
            }
        }
    }

}