Solved

cloneing object derived from treenode

Posted on 2004-04-23
5
333 Views
Last Modified: 2007-12-19
Hello,
I am trying to implement ICloneable's Clone() function,  using Serialization.  However, my code causes an exception.

I have a class derived from TreeNod called "Node1".

In Node1, I have implemented Clone() using serialization.

Wen i call the Clone() function, the following exception is thrown at the "Deseialize" call.   ------>

"An unhandled exception of type 'System.Runtime.Serialization.SerializationException' occurred in mscorlib.dll
Additional information: The constructor to deserialize an object of type WindowsApplication1.Node1 was not found."


Can somebody explain please.  To run the example that is posted below, select a node in the form, and press "button 1".

TIA,
David.


using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

using System.IO;
using System.Runtime.Serialization.Formatters.Binary;

namespace WindowsApplication1
{
      /// <summary>
      /// Summary description for Form1.
      /// </summary>
      [Serializable]
      public class Form1 : System.Windows.Forms.Form
      {
            private System.Windows.Forms.TreeView treeView1;
            private System.Windows.Forms.Button button1;
            private Node1 mClone;
            /// <summary>
            /// Required designer variable.
            /// </summary>
            private System.ComponentModel.Container components = null;

            public Form1()
            {
                  //
                  // Required for Windows Form Designer support
                  //
                  InitializeComponent();

                  treeView1.Nodes.Add(new Node1("node1.1",1));
                  treeView1.Nodes[0].Nodes.Add(new Node1("node1.2",2));
                  treeView1.Nodes[0].Nodes.Add(new Node1("node1.3",3));            
            }

            /// <summary>
            /// Clean up any resources being used.
            /// </summary>
            protected override void Dispose( bool disposing )
            {
                  if( disposing )
                  {
                        if (components != null)
                        {
                              components.Dispose();
                        }
                  }
                  base.Dispose( disposing );
            }

            #region Windows Form Designer generated code
            /// <summary>
            /// Required method for Designer support - do not modify
            /// the contents of this method with the code editor.
            /// </summary>
            private void InitializeComponent()
            {
                  this.treeView1 = new System.Windows.Forms.TreeView();
                  this.button1 = new System.Windows.Forms.Button();
                  this.SuspendLayout();
                  //
                  // treeView1
                  //
                  this.treeView1.ImageIndex = -1;
                  this.treeView1.Location = new System.Drawing.Point(32, 24);
                  this.treeView1.Name = "treeView1";
                  this.treeView1.SelectedImageIndex = -1;
                  this.treeView1.Size = new System.Drawing.Size(121, 192);
                  this.treeView1.TabIndex = 0;
                  //
                  // button1
                  //
                  this.button1.Location = new System.Drawing.Point(192, 72);
                  this.button1.Name = "button1";
                  this.button1.TabIndex = 1;
                  this.button1.Text = "button1";
                  this.button1.Click += new System.EventHandler(this.button1_Click);
                  //
                  // Form1
                  //
                  this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
                  this.ClientSize = new System.Drawing.Size(292, 273);
                  this.Controls.Add(this.button1);
                  this.Controls.Add(this.treeView1);
                  this.Name = "Form1";
                  this.Text = "Form1";
                  this.ResumeLayout(false);

            }
            #endregion

            /// <summary>
            /// The main entry point for the application.
            /// </summary>
            [STAThread]
            static void Main()
            {
                  Application.Run(new Form1());
            }

            private void button1_Click(object sender, System.EventArgs e)
            {
                  mClone = (Node1)((Node1)treeView1.SelectedNode).Clone();

            }
      }


      [Serializable]
      public class Node1 : TreeNode,ICloneable
      {
        public int mI;
            
            public Node1():base()
            {
            }

            public Node1(String s, int myInt): base(s)
            {
                  Text = s;
                  mI = myInt;
            }

            public override object Clone()
            {
                  MemoryStream ms = new MemoryStream();
                  BinaryFormatter bf = new BinaryFormatter();
                  // Serialize the object into the stream.
                  bf.Serialize(ms, this);
                  //Position streem pointer back to first byte.
                  ms.Seek(0, SeekOrigin.Begin);
                  // Deserialize into another object.
                  Node1 cloneObject = (Node1)bf.Deserialize(ms);
                  // Release memory.
                  ms.Close();

                  return cloneObject;
            }
      };

}


0
Comment
Question by:dave_p_r_b
  • 2
5 Comments
 
LVL 23

Expert Comment

by:rama_krishna580
ID: 10901014
0
 

Author Comment

by:dave_p_r_b
ID: 10901524
hello R.K.
I applied the changes from the article, but it appears to make no difference....

thanks for your input.
David.
0
 

Author Comment

by:dave_p_r_b
ID: 11151483
answer: its not possible to serialize a treenode.
0
 

Accepted Solution

by:
ee_ai_construct earned 0 total points
ID: 11757138
PAQed, with points refunded (300)
ee_ai_construct - CS Mod
0

Featured Post

Networking for the Cloud Era

Join Microsoft and Riverbed for a discussion and demonstration of enhancements to SteelConnect:
-One-click orchestration and cloud connectivity in Azure environments
-Tight integration of SD-WAN and WAN optimization capabilities
-Scalability and resiliency equal to a data center

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

We all know that functional code is the leg that any good program stands on when it comes right down to it, however, if your program lacks a good user interface your product may not have the appeal needed to keep your customers happy. This issue can…
Introduction Hi all and welcome to my first article on Experts Exchange. A while ago, someone asked me if i could do some tutorials on object oriented programming. I decided to do them on C#. Now you may ask me, why's that? Well, one of the re…
Nobody understands Phishing better than an anti-spam company. That’s why we are providing Phishing Awareness Training to our customers. According to a report by Verizon, only 3% of targeted users report malicious emails to management. With compan…

830 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question