Re: Help needed with a complicated application - C# Discussion Boards

Sorry for the newbe questions but I am quite novice in this type of high level programming.
I don't really understand how the code you sent me works,
can you please explain it a bit, and tell me where my new thread comes in to action?

I have my class which collects all the data for the graph into a member control,
I want that member control to be updated from another thread, how do I use the code you
presented to do so?

thank you .

Hello,

The thread where you collect the data for the Graph has a referenz of the "memberControl"?!
The "memberControl" holds the ZeGraph Control?!

If you now add a/the method like I gave you before, to the memberControls code,
the thread should be able to call this method.

The thread can now path the value for the graph to this method.
The "InvokeRequired" property of the Control class does a check if it's neccesary to Invoke the method.
Reason is, that you also could call the method from inside the thread, and there the invoke is not needed.

In case of "InvokeRequired" is "true" the method will be called again by the "Invoke" call, and next time "InvokeRequired" will be "false". (debug it, for easier understanding).
At the first call ("InvokeRequired" is "true") the code after the if statement is not going to be executed.

After Invoke you can use the pathed datas to set the ZedGraph properties.

Hope it helps!

All the best,

Martin

thank you very much.

I am reading it now and hope I will understand and utilize successfully what you have written.

thanks a lot.

Hello again dear Mr Martin,

First of all I want to thank you a lot for your help it was very, informative, and it helped me with
a different problem I encountered.
Still it did not solve my refresh problem. and y?

it's not happening to me because a different thread is calling the function, it happens even if everything is done in the same thread.

You see, I have me a function that creates data for the zedGraph control to show.
everything is working fine, and the underlying graph is probably OK.
the problem is that I need to move attention form the form and return, when I return
I can see the changes.

I will patch the snippet here, maybe this will help:

#region ZedGraph_Log Analysis
        private void lgAnalysisZedGraphControl_Load(object sender, EventArgs e)
        {
            CreateGraph(lgAnalysisZedGraphControl);
            SetSize();
        }
        private void SetSize()
        {
            lgAnalysisZedGraphControl.Location = new Point(10, 10);
            // Leave a small margin around the outside of the control

            lgAnalysisZedGraphControl.Size = new Size(lgAnalysisPanelShowGraph.Width - 10, lgAnalysisPanelShowGraph.Height - 10);
        }
        delegate void createCurvesHandler(ZedGraphControl zgc);
        private void CreateGraph(ZedGraphControl zgc)
        {

            // get a reference to the GraphPane
            zgc.GraphPane.CurveList.Clear(); //clear all previous data from graph
            zgc.GraphPane.XAxis.Type = AxisType.Date;
            Thread startCreateCureves = new Thread(delegate() { createCurves(zgc); });
            startCreateCureves.Start();
        }

private void createCurves(ZedGraphControl zgc)
        {
            if (zgc.InvokeRequired)
            {
                createCurvesHandler d = new createCurvesHandler(createCurves);
                zgc.Invoke(d, new object[] { zgc});
            }
            else
            {
                ColorSymbolRotator rotator = new ColorSymbolRotator();
                #region create curves as needed
                for (int i = 0; i < lgControlsPanel.Controls.Count; i++)
                {
                    if (lgControlsPanel.Controls[i] == angleCheckBox)
                        if (angleCheckBox.Checked)
                        {
                            foreach (string key in valveCheckedListBox.Items)
                            {
                                if (valveCheckedListBox.CheckedItems.Contains(key))
                                {
                                    zgc.GraphPane.AddCurve(key + ": Angle", anglePointArr[HexToLong(key)], rotator.NextColor, rotator.NextSymbol);
                                }
                            }
                        }

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

}
                #endregion
                zgc.AxisChange();
            }
        }

Hello,

I have to tell you that this doesn't make any sence!
From my understanding of your first questions, I asumed you want to make a thread for collecting the datas for your Graph.
But hat I see here is that you have the datas and start a thread to fill the datas to your Graph.

And the first thing which is done in the thread is to invoke it back to the GUI thread.

For your problem with the Zed Graph (without using threads), you should conntact the ZedGraph forum I guess!
Sorry, for not really helping you out!

All the best,

Martin

Is there a way of calling a method but not calling the first line of the method?

I have a generic List called PlayHand. I add to this list in the method PlayGame(). When the button is clicked I want to add a Card type to this list. But after the method PlayGame() has been called and the method has completed, the generic list PlayHand clears.

Can anyone help? Im really stuck on this!

Lucy

Lucy_H85 wrote:
Is there a way of calling a method but not calling the first line of the method?

I don't think so. What you can do is add boolean parameter to that method, and have condition on first line, something like

void MyMethod(bool shouldExecuteFirstLine)
{
  if(shouldExecuteFirstLine)
  {
   ...
  }
   /* rest of method body */
}

Lucy_H85 wrote:
I have a generic List called PlayHand. I add to this list in the method PlayGame(). When the button is clicked I want to add a Card type to this list. But after the method PlayGame() has been called and the method has completed, the generic list PlayHand clears.

Uh, I don't follow Frown | :(

Can you show your code?

[My Blog]
"Visual studio desperately needs some performance improvements. It is sometimes almost as slow as eclipse." - Rüdiger Klaehn
"Real men use mspaint for writing code and notepad for designing graphics." - Anna-Jayne Metcalfe

Sorry I am very new to C# and I am trying alter a console application example from a book to a windows form to test my skills and how much I have learnt. I think I haven't learnt to much and I have taken on a huge task.

I have this method PlayGame()

        public void PlayGame()<br />
        {<br />
            Player[] players = new Player[1];<br />
<br />
            for (int p = 0; p < players.Length; p++)<br />
            {<br />
                string playerName = listBox1.SelectedItem.ToString();<br />
                players[p] = new Player(playerName);<br />
            }<br />
<br />
            if (players == null)<br />
                return;<br />
<br />
            for (int p = 0; p < players.Length; p++)<br />
            {<br />
                for (int c = 0; c < 7; c++)<br />
                {<br />
                    players[p].PlayHand.Add(playDeck.GetCard(currentCard++));<br />
                }<br />
            }<br />
<br />
            //int currentPlayer;<br />
            Card playCard = playDeck.GetCard(currentCard++);<br />
            discardedCards.Add(playCard);<br />
<br />
            for (currentPlayer = 0; currentPlayer < players.Length; currentPlayer++)<br />
            {<br />
                label1.Text = players[currentPlayer].Name + "'s turn.";<br />
                labelHiden.Text = Convert.ToString(currentPlayer);<br />
                label2hiden.Text = Convert.ToString(players[currentPlayer]);<br />
                foreach (Card card in players[currentPlayer].PlayHand)<br />
                {<br />
                    listBox2.Items.Add(Convert.ToString(card));<br />
                    //richTextBox1.Text = Convert.ToString(card);<br />
                }<br />
                label3.Text = "Card in play: " + playCard;<br />
<br />
                if (discardedCards.Contains(playCard))<br />
                {<br />
                    discardedCards.Remove(playCard);<br />
                }<br />
                players[currentPlayer].PlayHand.Add(playCard);<br />
                label1.Text = "Drawn: " + playCard;<br />
<br />
                label1.Text = "New Hand:";<br />
<br />
                for (int i = 0; i < players[currentPlayer].PlayHand.Count; i++)<br />
                {<br />
                    listBox2.Items.Add(i + 1 + ": " + players[currentPlayer].PlayHand[i]);<br />
                    //richTextBox1.Text = i + 1 + ": " + players[currentPlayer].PlayHand[i];<br />
                }<br />
                label3.Text = "Choose card to discard:";<br />
            }<br />
            current = playCard;<br />
            //return;<br />
            <br />
        }

I only want this section of code to execute if a button is clicked:

<br />
                if (discardedCards.Contains(playCard))<br />
                {<br />
                    discardedCards.Remove(playCard);<br />
                }<br />
                players[currentPlayer].PlayHand.Add(playCard);<br />
                label1.Text = "Drawn: " + playCard;<br />

I was wondering if there was a way of breaking this loop to wait if the button is clicked.

Lucy

Lucy_H85 wrote:
Player[] players = new Player[1];

As I thought, this creates a new local variable. Turn it into a member if you want to reuse it.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Thank you! I will try that now.

Lucy

Sounds like your problem is tha the list is created inside the method and so has no state. Is it a member ? If it is, then it's Clear method is being called somewhere.

What is this first line you're trying to avoid ( it can't be done without the approach someone else offered ) ?

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Hi All,

Can I covert the SqlDataReader into a user defined class? I will explain my doubt.

I have a user defined class named 'Member' which contains the fields same as in the 'Member' table in database.
Now I want to select the Members from database and converted to the array of class 'Member'.

Is it possible? Is it will causes to overkill?

Regards,

Hogan

You can create a method that received as a parameter an SqlDataReader object, and returns a Member array. There for each row in the database you create a new Member object, read the values and at the end return the array.

Hope it helps.

There are 10 kinds of people: those who understand binary and those who don't

Thank you for reply

It require a loop. isn't it? I am worried about the performance. This member class in my business layer. Actually SqlDataReader is enough for the purpose. But I want to make it more slandered form

Regards,
Hogan

Yes, you need a loop. I gave you a solution to a problem, though i would rather work with SqlDataReader

There are 10 kinds of people: those who understand binary and those who don't

Ok understood. Thanks to spend your time with me Big Grin | :-D

Regards,
Hogan

[Message Deleted]

Seems like an odd choice of topic. I mean, I can't see how it equates to anything other than C# 101. How have you found yourself giving this seminar if you don't know what to say ?

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

ha ha i was helpless.it was thrust on me.... Frown | :(

so any idea what all topics to talk about........

j

Generics? Iterators? Take a look at C# spec and pick something!

[My Blog]
"Visual studio desperately needs some performance improvements. It is sometimes almost as slow as eclipse." - Rüdiger Klaehn
"Real men use mspaint for writing code and notepad for designing graphics." - Anna-Jayne Metcalfe

Trustapple wrote:
its urgent

It's always urgent. There's never been a post that said - please take your time.

Trustapple wrote:
if there is any pdf available plz pass it on

Google not working at your end? I assume that you can't get to Google because of your lack of a full size keyboard; why else would you use text speak on a forum?

This is a basic topic. How can you give a seminar on this if you don't know about it?

Deja View - the feeling that you've seen this post before.

ok
thanks

j

can i write assembly at C++.net

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*sgh*

1 - this is the wrong forum to ask that
2 - this follows on from your other question, so reply to me instead of creating a new thread
3- try to use intelligent subject lines

You can write assembly in C++, because it's C++, but I'm not sure if it's possible to write code that emits assembly and also contains managed code.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

can i write assembly at C#.Net?

123