how can i add the plus minus symbol in treeview in c# - C# Discussion Boards

Guffa1-Aug-08 2:44

1-Aug-08 2:44

When you abort the thread, you kill the message pump that handles the messages that does everything in the GUI. There is nothing that can handle the message that says that the window should be removed.

Generally, using the Abort method is a bad way to stop a thread. The Abort method kills the thread by throwing a ThreadAbortException in it, which can happen anywhere in the thread's code. It's difficult to write code that can cope with that situation in a well behaved manner.

Despite everything, the person most likely to be fooling you next is yourself.

Re: Threading problem

MarkB7771-Aug-08 2:56

MarkB777

1-Aug-08 2:56

Hi Guffa,

Thanks for you reply, I'm getting really stuck on this.

I've been trying to do what the guy above suggested with little success, here's where I'm at right now.

<br />
Form2 loadForm;<br />
<br />
       private delegate void TestDelegate();<br />
       public Form1()<br />
       {<br />
          InitializeComponent();<br />
<br />
          Thread t = new Thread(delegate() { <br />
              this.loadForm = new Form2(); <br />
          });<br />
          t.Start();<br />
<br />
          this.BeginInvoke(new TestDelegate(Openform));<br />
<br />
          Thread.Sleep(4000); // do stuff in main thread     <br />
<br />
          this.BeginInvoke(new TestDelegate(Closeform));<br />
<br />
          t.Abort();<br />
       }<br />
<br />
        private void Openform()<br />
        {<br />
            this.loadForm.ShowDialog();<br />
        }<br />
<br />
        private void Closeform()<br />
        {<br />
            this.loadForm.Dispose();<br />
        }<br />

This isnt even compiling at moment (Error: Invoke or BeginInvoke cannot be called on a control until the window handle has been created.), so I'm getting pretty anoyed with the whole threading thing.

How else can you close a thread without calling Abort? Can you spot where i'm screwing up here?

Im trying to:

1. Create a (non-visible) window in thread 1
2. Show a loading window in thread 2 (form 2)
3. Do some loading in thread 1
4. Close the loading window in thread 2
5. Show the window in thread 1

Thanks heaps,

Mark Brock

Click here to view my blog

Re: Threading problem

Mogaambo1-Aug-08 9:20

Mogaambo

1-Aug-08 9:20

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Threading;

namespace WindowsApplication2
{
public partial class Form1 : Form
{
private delegate void TestDelegate();
Form2 loadForm;
public Form1()
{
InitializeComponent();
loadForm = new loadForm();
Thread t=new Thread(start1);
t.Start();
}
private void Openform()
{
loadForm.ShowDialog();
}

private void Closeform()
{
loadForm.Dispose();
}
private void start1()
{
this.BeginInvoke(new TestDelegate(Openform));
Thread.Sleep(2000); // do stuff in main thread

this.BeginInvoke(new TestDelegate(Closeform));
}
}
}

//Try this one

Re: Threading problem

MarkB7771-Aug-08 13:38

MarkB777

1-Aug-08 13:38

Hey thanks for your help.

It works fine if i'm doing no loading after the thread start command, but if I add the PopulateTree call (or just a Thread.Sleep()), it gives me a InvalidOperationException (Invoke or BeginInvoke cannot be called on a control until the window handle has been created).

Here's what i've got:

<br />
        public PALImporter()<br />
        {<br />
                this.loadWindow = new LoadingWindow();<br />
                Thread loadingThread = new Thread(new ThreadStart(this.BeginLoad));<br />
                loadingThread.Start();<br />
<br />
                PopulateTree(new SqlCommand("SELECT * FROM Users", myConnection), (int)Tables.Users);<br />
                // more loading etc etc.....<br />
        }<br />
        }<br />
<br />
        private void BeginLoad()<br />
        {<br />
            this.BeginInvoke(new LoadDelegate(OpenLoadForm));<br />
<br />
            Thread.Sleep(2000);<br />
<br />
            this.BeginInvoke(new LoadDelegate(CloseLoadForm));<br />
        }<br />
<br />
        private void OpenLoadForm()<br />
        {<br />
            this.loadWindow.ShowDialog();<br />
        }<br />
<br />
        private void CloseLoadForm()<br />
        {<br />
            this.loadWindow.Dispose();<br />
        }<br />

Mark Brock

Click here to view my blog

Re: Threading problem

MarkB7771-Aug-08 14:46

MarkB777

1-Aug-08 14:46

Nevermind,

I decided to flag the threading and just do it all on the one thread.

Cheers,

Mark Brock

Click here to view my blog

Sorting out the Data

Hum Dum31-Jul-08 22:15

Hum Dum

31-Jul-08 22:15

In DB having 2 different tables,
1 contain the Title/Heading for feild used in 2nd table.

For ex: 1 table contain Group Feild like Car, Bus etc
2nd table contain feild like car_model_1, car_Model_2, bus_model_1, bus_model_2 etc.......

From this 2nd table i need to put them in there belonging group.

Like searching and sorting the data, then using
-How many cars under Car group, bus in Bus group.

User is selecting car_model_1,car_model_n, bus_model_1 or any other option he wants, then i need to check every option & sort them according to there group.

Can any one fwd a link or some help.

Thanks & regards.

Re: Sorting out the Data

User 665831-Jul-08 22:45

User 6658

31-Jul-08 22:45

I think you need three relations in this case:

Relation 1:

Group (ID PK, Name)
-----
1, Car
2, Bus
3, Sportscar
4, Bike
...

Relation 2:

Model (ID PK, Name)
----
1, car_model_1
2, car_model_2
n, car_model_n
n+1, bus_model_1
n+m, bus_model_m

Relation 3:

ModelToGroup (Model FK, Group FK)
----
1, 1
2, 1
n, 1
n+1, 2
n+m, 2
...

According to what model the user selects, you can look which group this model belongs to and count the groups.

regards

modified 12-Sep-18 21:01pm.

how can i add the plus minus symbol in treeview in c#

sanjeevmedhi31-Jul-08 22:05

sanjeevmedhi

31-Jul-08 22:05

Hi all,

I have a customized treeview, now i want to add plus-minus sign in the node, its not happening when i have made ShowPlusMinus property true.can anybody help me to do that.

thanks in advance

Re: how can i add the plus minus symbol in treeview in c#

Anurag Gandhi31-Jul-08 22:27

Anurag Gandhi

31-Jul-08 22:27

By default it automatically gets added when your node contains a child node.

Anurag Gandhi.
http://www.gandhisoft.com
Life is a computer program and every one is the programmer of his own life.

Re: how can i add the plus minus symbol in treeview in c#

sanjeevmedhi31-Jul-08 22:43

sanjeevmedhi

31-Jul-08 22:43

Hi Anurag,

thanks for your information. but i need to hide some default implemntation for eg. checkbox in parent node, for that i have used DrawDefault =false, so i want to draw the plusminus of my own. can you plz share some information regaridng this

Thanks in advance

Re: how can i add the plus minus symbol in treeview in c#

Mycroft Holmes31-Jul-08 22:49

Mycroft Holmes

31-Jul-08 22:49

Not sure it's possible in the standard Treeview. However Anurag is right, I add a dummy child to each node when doing on demand trees and then check the children on BeforeExpand event.

Never underestimate the power of human stupidity
RAH

Re: how can i add the plus minus symbol in treeview in c#

PIEBALDconsult1-Aug-08 15:29

PIEBALDconsult

1-Aug-08 15:29

The last time I had that problem it was because I has set the BackColor to Black and hadn't changed the ForeColor. D'Oh! | :doh:

Re: how can i add the plus minus symbol in treeview in c#

Medha jha2-Aug-08 2:57

Medha jha

2-Aug-08 2:57

Hi
you can use this code to add Prent and Child nodes and plus-minus sign in the node wilol be added

Dim node As TreeGridNode
node= TreeGridNode.add(Id,name) //For parent node
node.nodes.add(Id,name) // for Child node

Regards

Figured out why C# people are so finicy about layout

Mycroft Holmes31-Jul-08 21:22

Mycroft Holmes

31-Jul-08 21:22

Kid sister rule got to the title!

You don't have the combo boxes above the code page to access the controls and the methods in the current class WTF | :WTF:

. Or am I missing something. This is the most frustrating thing (and square brackets) in the change from VB to C#.

Got my DAL working, half way through the code gen app Cool | :cool:

I had forgotten how much fun it is to be applying something new. I've been here too long, time to move on.

Never underestimate the power of human stupidity
RAH

Re: Figured out why C# people are so finicy about layout

Simon P Stevens31-Jul-08 21:47

Simon P Stevens

31-Jul-08 21:47

Mycroft Holmes wrote:
You don't have the combo boxes above the code page to access the controls and the methods in the current class

I do. Don't remember turning it on. I'm sure they were there by default.

Simon

Re: Figured out why C# people are so finicy about layout

Mycroft Holmes31-Jul-08 21:51

Mycroft Holmes

31-Jul-08 21:51

damn now I have to rat through all the menus and options to find when the switch is. Thanks for the info.

[got it] options text editor allow navigation bar!

Never underestimate the power of human stupidity
RAH

Re: Figured out why C# people are so finicy about layout

stancrm31-Jul-08 22:26

stancrm

31-Jul-08 22:26

Tools > Options > TextEditor > C# > General > Navigation Bar

How to Acess permission for SPSite

manju#12331-Jul-08 19:34

manju#123

31-Jul-08 19:34

Hi all...
How to give permission for the user to access the sharepoint documents data to be read......
I am trying this code but its not working...plz do delp..

SPSecurity.RunWithElevatedPrivileges(delegate()
                    {
                        Console.WriteLine(" Entered SPSIte path");
                        using (SPSite RootSite = new SPSite(listPath))                    
                        {
                            RootSite.AllowUnsafeUpdates = true;
                            Console.WriteLine("1Entered SPSIte path");
                            using (SPWeb SiteCollection = RootSite.OpenWeb())
                            {
                                string path = listPath;// RootSite.MakeFullUrl(PageName);
                                SPFile file = SiteCollection.GetFile(path);
                                string TimeCreated = file.TimeCreated.ToLongDateString();
                                Console.WriteLine("1.1: Created Date is :" );//+ TimeCreated);
                            }
                        }
                    });

thank you
manju

Hi..
I am Mnaju.I have Completed my B.E Computers Science.Lokking for a job.I am interested in VC++
manju

monitor Http traffic

George_George31-Jul-08 19:01

George_George

31-Jul-08 19:01

Hello everyone,

I want to monitor Http traffic from my local computer (Windows Server 2003) -- not always using IE -- to some specific web site.

I am interested in the headers/bodies in request/response. Any tool to use? Or code samples so that I can easily write one?

thanks in advance,
George

Re: monitor Http traffic

stancrm31-Jul-08 21:36

stancrm

31-Jul-08 21:36

search in codeproject for "packet capture". There are some articles about that.

Re: monitor Http traffic

George_George3-Aug-08 17:37

George_George

3-Aug-08 17:37

Thanks stancrm,

I think WireShark tool is good enough for me. I do not need programming, using existing tool is fine.

regards,
George

Re: monitor Http traffic

User 665831-Jul-08 22:32

User 6658

31-Jul-08 22:32

For developers, there's a library called WinPcap[^] (and certainly some .NET wrappers for it) which you can use.

As a standalone tool, the best I know of is WIreshark[^].

regards

modified 12-Sep-18 21:01pm.

Re: monitor Http traffic

George_George3-Aug-08 17:37

George_George

3-Aug-08 17:37

Cool, Greeeg!

I like WireShark tool!

regards,
George

Re: monitor Http traffic

Simon P Stevens31-Jul-08 22:38

Simon P Stevens

31-Jul-08 22:38

There's also Fiddler[^]

Simon

Re: monitor Http traffic

George_George31-Jul-08 23:15

George_George

31-Jul-08 23:15

Thanks Simon,

Fiddle is good, but can only monitor IE http traffic. I want to monitor some specific application's traffic. Any comments? Could Fiddle do this or any other recommendations for this goal?

regards,
George

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.