Serialize And Deserialize Binary Tree

1. Serialize And Deserialize Binary Tree

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace SerializeAndDeserializeBinaryTree
{
    class Program
    {
        static void Main(string[] args)
        {
            //Test serialize

            List<string> serializeResult = new List<string>();

            nodes<string> rootNode = BinaryTree.Initialization();
            BinaryTree.SerializationByPreOrder(rootNode, serializeResult);

            //Test Deserialize
            nodes<string> root = null;

            int index = 0;
            BinaryTree.DeSerializationByDePreorder(root, serializeResult, ref index);
           
        }
    }


    public class nodes<T>
    {
        T data;
        nodes<T> Lnode, rnode, pnode;
        public T Data
        {
            get { return data; }
            set { data = value; }
        }
        public nodes<T> LNode
        {
            get { return Lnode; }
            set { Lnode = value; }
        }
        public nodes<T> RNode
        {
            get { return rnode; }
            set { rnode = value; }
        }
        public nodes<T> PNode
        {
            get { return pnode; }
            set { pnode = value; }
        }
        public nodes() { }
        public nodes(T data)
        {
            this.data = data;
        }
    }

   public class BinaryTree
    {     

        //构造一棵已知的二叉树  
       static public nodes<string> Initialization()
        {
            nodes<string>[] binTree = new nodes<string>[8];

            //创建节点  
            binTree[0] = new nodes<string>("A");
            binTree[1] = new nodes<string>("B");
            binTree[2] = new nodes<string>("C");
            binTree[3] = new nodes<string>("D");
            binTree[4] = new nodes<string>("E");
            binTree[5] = new nodes<string>("F");
            binTree[6] = new nodes<string>("G");
            binTree[7] = new nodes<string>("H");

            //使用层次遍历二叉树的思想，构造一个已知的二叉树  
            binTree[0].LNode = binTree[1];
            binTree[0].RNode = binTree[2];
            binTree[1].RNode = binTree[3];
            binTree[2].LNode = binTree[4];
            binTree[2].RNode = binTree[5];
            binTree[3].LNode = binTree[6];
            binTree[3].RNode = binTree[7];

            //返回二叉树根节点  
            return binTree[0];
        }

        //先序遍历  
        static public void SerializationByPreOrder(nodes<string> rootNode, List<string> a)
        {
            if (rootNode != null)
            {
                Console.WriteLine(rootNode.Data);
                a.Add(rootNode.Data);
                SerializationByPreOrder(rootNode.LNode, a);
                SerializationByPreOrder(rootNode.RNode, a);
            }
            else
            {
                a.Add(string.Empty);
                Console.WriteLine("#");
            }
        }


        static public void DeSerializationByDePreorder(nodes<string> rootNode, List<string> a, ref int index)
        {
            if (a[index] != string.Empty)
            {
                rootNode = new nodes<string>();
                Console.WriteLine(a[index]);
                rootNode.Data = a[index];
                index = index + 1;
                DeSerializationByDePreorder(rootNode.LNode, a,ref index);
                DeSerializationByDePreorder(rootNode.RNode, a, ref index);
            }
            else
            {
                index = index + 1;
                Console.WriteLine("#");
                return;
            }
        }

        //中序遍历二叉树    
        static void MidOrder<T>(nodes<T> rootNode)
        {
            if (rootNode != null)
            {
                MidOrder<T>(rootNode.LNode);
                Console.WriteLine(rootNode.Data);
                MidOrder<T>(rootNode.RNode);
            }
        }

        //后序遍历二叉树   
        static void AfterOrder<T>(nodes<T> rootNode)
        {
            if (rootNode != null)
            {
                AfterOrder<T>(rootNode.LNode);
                AfterOrder<T>(rootNode.RNode);
                Console.WriteLine(rootNode.Data);
            }
        }
        //层次遍历二叉树         
        static void LayerOrder<T>(nodes<T> rootNode)
        {
            nodes<T>[] Nodes = new nodes<T>[20];
            int front = -1;
            int rear = -1;
            if (rootNode != null)
            {
                rear++;
                Nodes[rear] = rootNode;
            }
            while (front != rear)
            {
                front++;
                rootNode = Nodes[front];
                Console.WriteLine(rootNode.Data);
                if (rootNode.LNode != null)
                {
                    rear++;
                    Nodes[rear] = rootNode.LNode;
                }
                if (rootNode.RNode != null)
                {
                    rear++;
                    Nodes[rear] = rootNode.RNode;
                }
            }
        }
    }
}