MultiThreading - C# Discussion Boards

25-Jun-07 11:11

Works fine on my machine, I modified the solution to contain all three projects, set the output path as well to a common location so that I didn't have to copy and paste. And added some code to dump the name to the console.

Screenshot can be seen here[^], and you're saying this fails on your computer? Confused | :confused:

Re: Loading referenced assemblies using System.Reflection

thegloomyclown25-Jun-07 11:27

thegloomyclown

25-Jun-07 11:27

Ah, I believe that would work for me. The problem is when the executing assembly and assembly being "analysed" (with referenced assembly) are in different folders (hence why I used 2 solutions).

It may be that Assembly.Load isn't meant to be used in the way I'm using it, but that would surprise me, since I'm passing it a normal AssemblyName object.

Re: Loading referenced assemblies using System.Reflection

Ed.Poore25-Jun-07 11:59

25-Jun-07 11:59

Ah ok, I didn't realise that was the problem, I shall take another look.

Re: Loading referenced assemblies using System.Reflection

Ed.Poore25-Jun-07 12:19

25-Jun-07 12:19

Just tried what you say and it's bizarre, perhaps it's to do with the fact that the CLR looks in the directory, I'm not sure. Maybe this is a bug with the framework, I would think so since the docs don't state otherwise. But you're not the only one:

Person 1[^] and here[^].

I haven't read through this[^] page fully but it looks like it might be of interest to you.

Re: Loading referenced assemblies using System.Reflection

thegloomyclown26-Jun-07 4:45

thegloomyclown

26-Jun-07 4:45

Cheers, that page does look very handy, I'll have a full read of it sometime. I'll probably do what I suggested and try and work out the filename when Load doesn't work.

Thanks for all your help!

Re: Loading referenced assemblies using System.Reflection

Ed.Poore26-Jun-07 5:02

26-Jun-07 5:02

Good luck in that and thanks for pointing out this, will save me some head scratching in the future.

MultiThreading

HexaDeveloper25-Jun-07 5:53

HexaDeveloper

25-Jun-07 5:53

hi all, i made this code to make multithreads for one method and every thread take one packet to move but it didnot work, Is there any error in this code

private void btn_simulate_Click(object sender, EventArgs e)<br />
      {<br />
          for (int i = 0; i < lineArray.LineList.Count; i++)<br />
          {<br />
              /// Assign a method to thread to execute <br />
              packetsMovingThreadArray.Add(new Thread(threadProcedure));<br />
              dataPacketsArray.Add(new Packet());<br />
          }<br />
          this.btn_simulate.Enabled = false;<br />
          this.btn_stop.Enabled = true;<br />
          movingPacketThreadFlag = true;<br />
          for (int i = 0; i < lineArray.LineList.Count; i++)<br />
          {<br />
              ((Thread)packetsMovingThreadArray[i]).Start();<br />
          }<br />
      }<br />
      int simulationIndex = -1;<br />
      private void threadProcedure()<br />
      {<br />
          simulationIndex++;<br />
          Packet pack = ((Packet)dataPacketsArray[simulationIndex]);<br />
          AdHocMobility.simulate(ref pack,((Line)lineArray.LineList[simulationIndex]),<br />
              this);<br />
      }<br />
      /// <summary><br />
      ///  Abort the Thread of painting<br />
      /// </summary><br />
      private void btn_stop_Click(object sender, EventArgs e)<br />
      {<br />
          try<br />
          {<br />
              this.btn_stop.Enabled = false;<br />
              this.btn_simulate.Enabled = true;<br />
              packetsMovingThreadArray.Clear();<br />
              foreach (Thread Th in packetsMovingThreadArray )<br />
              {<br />
                  Th.Abort(); <br />
              }<br />
              simulationIndex = -1;<br />
              movingPacketThreadFlag = false;<br />
              Invalidate();<br />
          }<br />
          catch (Exception ex)<br />
          {<br />
              MessageBox.Show(ex.Message);<br />
          }<br />
      }

thanks

Generator

led mike25-Jun-07 6:11

25-Jun-07 6:11

HexaDeveloper wrote:
Is there any error in this code

If "simulate()" is painting you can't do that from a worker thread
and
the way you are using simulationIndex does not look safe

in short you need to do some more reading on multi-thread concepts like synchronization. I recommend books by Jeffery Richter on that subject.

HexaDeveloper25-Jun-07 7:00

HexaDeveloper

25-Jun-07 7:00

led mike wrote:
If "simulate()" is painting you can't do that from a worker thread

hi can u explain this statement ,

in simulate i called movePacket() and this method returns
new points for the packet and i draw it in onPaint()

and actually i want to ask what is the meaning of not safe to use simulationIndex

thanx

Generator

led mike25-Jun-07 9:21

25-Jun-07 9:21

Multi-Threaded application almost always need one or more forms of "Syncrhonization[^]"

It's not something that can be explained in a few sentences in a forum message. Look at the link and the author [^]I suggested.

Re: Structuring my program

Hesham Yassin26-Jun-07 5:47

Hesham Yassin

26-Jun-07 5:47

use System.Threading.ThreadStart delegate instead of Thread

Structuring my program

ruanr25-Jun-07 4:39

ruanr

25-Jun-07 4:39

Hi,

This is hard to explain, but it is a simple enough problem...

I have a large dataset (Class 'Dataset') that will be altered by a sequence of events (Abstract class Event, not events in the sense of delegate events). I need to be able to reconstruct the state of this dataset after any amount of events, so I designed an Event abstract class which will be extended for every type of event that can happen. An instance of the specific type is created, applied to the dataset, and stored in a list whenever an event occurs.

Now, it is quite important that the rest of my program does not modify any of the data without constructing an Event, otherwise if I recreate the dataset at that point in time (by re-applying all the events in my list) it will not be consistent with the original.

At the moment my Event has the abstract method Apply(Dataset data), which applies the changes for that event to the given dataset. However, this means I have to keep a most of Dataset's members public, and (besides being bad OO practice) if I or someone else accidentally modify any of them w/o an Event, it's going to be quite hard to debug.

My other option would be to include an overloaded method in Dataset that applies each Event accordingly, but I'm not sure how it will apply. For example, if I have extended Event to EventA, and do:

<br />
Event e = new EventA();<br />
<br />
Dataset.ApplyEvent (e);<br />

and Dataset has two ApplyEvent methods:

<br />
public void ApplyEvent (Event e) {}<br />
<br />
public void ApplyEvent (EventA e) {}<br />

Will the overloaded method for EventA be called? Or is there a simpler, elegant solution I'm not thinking of?

Sorry for the long post and thanks for your help Smile | :)

led mike25-Jun-07 4:51

Re: Structuring my program

25-Jun-07 4:51

ruanr wrote:
I need to be able to reconstruct the state of this dataset after any amount of events

Are you talking about an "Undo" operation? If so please refer to the "Command Pattern[^]"

ruanr25-Jun-07 20:43

ruanr

25-Jun-07 20:43

That as well, but eventually I will need to export all the events to disk, and be able to reapply them to get the state of the set at any time during initial operation..

But thanks for the link, it is helpful

Re: Structuring my program

led mike26-Jun-07 5:08

Google Page Rank Calculator

26-Jun-07 5:08

ruanr wrote:
I will need to export all the events to disk, and be able to reapply them to get the state of the set

"the state of the set" ? Do you mean the DataSet? This is very confusing, if your end goal is to get a DataSet to some previous state, you just serialize the DataSet (like as XML) when that state is arrived at, and then when you want to get back to that you would just load a DataSet from the XML.

zeltera25-Jun-07 4:31

zeltera

25-Jun-07 4:31

Hi,
I have a problem I need to solve it quite fast: I need to write a function that have as input an URL, and return an number, the Google Page Rank for that page (like page rank that Google toolbar give)

Is someone here that know how to do this? I need to write this function in c# (to integrate in an existing application). Or an site to read how to do it!

Re: Google Page Rank Calculator

Vasudevan Deepak Kumar25-Jun-07 5:04

Vasudevan Deepak Kumar

25-Jun-07 5:04

I think there are a few hosted services that achieve this. A quick Google search revealed this: http://www.google.co.in/search?hl=en&q=Page+Rank+calculator&meta=[^]

How about invoking them using HttpWebRequest?

Vasudevan Deepak Kumar
Personal Homepage
Tech Gossips

Re: Google Page Rank Calculator

zeltera25-Jun-07 5:08

zeltera

25-Jun-07 5:08

All this "Page Rank Calculators" uses an algorithm to get the number representing the Rank. I need that algorithm. 2 years ago I wrote an php script that do this, but I lost the code, and I cannot find it (for now).

I posted here this question with the hope that someone have that algorithm (can be c# or php code).

Stack OverFlow Exception in C#

meeram39525-Jun-07 4:26

meeram395

25-Jun-07 4:26

Hi,

I'm developing one windows appln with C#. I'm getting the error msg as " An unhandled exception of Type 'System.StackOverflowException' occurred in mscorlib.dll" . Control stops at the place where I declared the hashtable as:

public class Logger : IDisposable
{
Hashtable htMsgCount;
}
public Logger()
{
htMsgCount = new Hashtable();
}

Control comes and stay at htMsgCount. What could be the problem. The funny thing is it was working fine just I made a few changes in my code. After compiling and tried to run, it is giving me this error. Anybody who knows please help me.

Thanks in advance.

Meeram395

led mike25-Jun-07 4:46

25-Jun-07 4:46

The problem is elsewhere in the call stack

meeram39525-Jun-07 19:53

meeram395

25-Jun-07 19:53

Hi,

I don't understand what you mean. Can you please clarify a little bit.

Meeram395

Re: Stack OverFlow Exception in C# [modified]

Guffa25-Jun-07 6:11

Guffa

25-Jun-07 6:11

Standard question #5:
No, that is not the code you are using. It can't produce that result. What does the code you are using look like?

The constructor of the class has to be inside the class, so the code that you have shown doesn't even compile. It's hard to tell what's wrong with a piece of code, when you are not even looking at the code that is actually used.

Post the actual code that you are using, or a complete example that reproduces the error.

---
single minded; short sighted; long gone;

meeram39525-Jun-07 19:39

meeram395

25-Jun-07 19:39

HI,

Thanks for the reply. The constructor is within the class only. I have put the closing braces wrongly before the constructor. Sorry for that.

-- modified at 1:44 Tuesday 26th June, 2007

Meeram395