?
Solved

Shortening a TreeView logic.

Posted on 2009-04-02
3
Medium Priority
?
429 Views
Last Modified: 2013-12-14
Hi I'm currently working on a TreeView with Oracle Database.
The thing is I have to connect to 2 databases in this TreeView and due to the column name and description naming differences I could'nt use the UNION function in the SQL statement.

So I used Code1 to populate the TreeView untill the 5th level and the code compile in less then 10 seconds.

After that I proceed to connecting the 2nd database and it'll be on the 6th level but when i put Code2 inside the "if (strList.Length == 5)" statement the code compile more then 2 minutes which is really unaccecptable.

I'm hoping if anyone could provide solutions to shorten the compilation time.
 Thanks in advaance.
// Code1
                    foreach (DataRow dr in ordt.Rows)
                    {
                        nodeCheck = new TreeNode();
                        nodeCheck.Name = dr[0].ToString();                        
                        strText = dr[2].ToString();
                        strDesc = dr[3].ToString();
                        strList = strText.Split('.');
                        nodeCheck.Text = strList[strList.Length - 1];
                        if (dr[1] != DBNull.Value)
                        {
                            node = treeScadaItems.Nodes.Find(dr[1].ToString(), true);
                            if (strList.Length == 5)
                                {
                                    node[0].Nodes.Add(nodeCheck);
                                }
                                else
                                { node[0].Nodes.Add(nodeCheck); }
                        }
                        else
                        {
                            treeScadaItems.Nodes.Add(nodeCheck);
                        } 
                    } 
                                    // Code2
                                    localSQL = "SELECT KEYID,PRODUCT_NAME,PRODUCT_DESC,PKEYID,PRODUCT_TYPE FROM PRODUCT_PT WHERE PKEYID LIKE '" + dr[0].ToString() + "'";
                                    OracleCommand cmdOracle1 = new OracleCommand(localSQL, localConnection);
                                    cmdOracle1.CommandType = CommandType.Text;
                                    drOracle = cmdOracle1.ExecuteReader();
                                    while (drOracle.Read())
                                    {
                                        nodeCheck = new TreeNode();
                                        nodeCheck.Name = dr[0].ToString();
                                        strText = drOracle.GetOracleString(1).ToString();
                                        nodeCheck.Text = strText.ToString();
                                        node[0].Nodes.Add(nodeCheck);
 
                                        nodeCheck.Tag = drOracle.GetOracleValue(0).ToString();
                                    }
                                    drOracle.Close();

Open in new window

0
Comment
Question by:csharp_learner
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 9

Accepted Solution

by:
kprestage earned 1500 total points
ID: 24061767
How many nodes does the first query add?  How about the second query?  Are you sure it is a code problem and not an issue with the Treeview loading too many nodes?  The Tree gets VERY slow when you start adding a lot of nodes to it.  
0
 
LVL 9

Assisted Solution

by:kprestage
kprestage earned 1500 total points
ID: 24061803
Also, are you calling the treeview's BeginUpdate before your loop and EndUpdate after your loop?  If not, try that and see if you have some improvement.
0
 

Author Comment

by:csharp_learner
ID: 24083680
Sorry for the late reply,

Yes your're correct there is alot of nodes the TreeView needs to load.
How can I put the BeginUpdate and EndUpdate into my code?
As I can only access to BeginEdit and BeginInvoke when i tried to access using treeview1.
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

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

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…
This article aims to explain the working of CircularLogArchiver. This tool was designed to solve the buildup of log file in cases where systems do not support circular logging or where circular logging is not enabled
This tutorial covers a step-by-step guide to install VisualVM launcher in eclipse.
The viewer will learn how to use and create keystrokes in Netbeans IDE 8.0 for Windows.
Suggested Courses

752 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