Re: Architecture Design Advice - C# Discussion Boards

Brian Olej2-Jan-03 14:23

2-Jan-03 14:23

Could you maybe derive your class from the MessageBox class?

Why waste time learning when ignorance in instantaneous
-Hobbes

Array Serialization - kinda urgent

Mr BallyDaHob2-Jan-03 5:18

Mr BallyDaHob

2-Jan-03 5:18

Hi All,
I'm stuck with a problem serializing and de-serializing an array. I'm hoping somebody will be able to help me with. I'm trying to serialize an array of my custom class Query to a file. But when I check the file, I can only see one query in there. And when I try to de-serialize it I get an error saying Object doesn't implement IConvertable.
Does anyone have any idea what I am doing wrong? I've put the code below, maybe yee'd like to compile it and check what’s going wrong?
Thanks,
Donal

using System;<br />
using System.IO;<br />
using System.Runtime.Serialization;<br />
using System.Runtime.Serialization.Formatters.Soap;<br />
using System.Collections;<br />
<br />
<br />
<br />
namespace ProjQueryManager<br />
{<br />
	/// <summary><br />
	/// Summary description for Class1.<br />
	/// </summary><br />
	class QueryManager<br />
	{<br />
		public QueryList qList;<br />
		string sourceFile = @"C:\source1.dta";<br />
<br />
		public QueryManager()<br />
		{<br />
			qList = new QueryList();<br />
		}<br />
		<br />
		public bool CheckQuerySourceFile()<br />
		{<br />
			return true;<br />
		}<br />
<br />
		public void addQuery(Query QueryInfo)<br />
		{<br />
			qList.Add(QueryInfo);<br />
		}<br />
		<br />
		public bool LoadFile()<br />
		{<br />
			FileStream inStream = new FileStream(sourceFile, FileMode.Open, FileAccess.Read);<br />
			StreamReader sReader = new StreamReader(inStream);<br />
			SoapFormatter soapReader = new SoapFormatter();<br />
			if(qList != null)<br />
				qList = null;<br />
			qList = (QueryList) soapReader.Deserialize(inStream);<br />
			inStream.Close();<br />
<br />
			foreach(Query q in qList)<br />
				q.PrintInfo();<br />
			return true;<br />
		}<br />
<br />
<br />
		public bool SaveQuerys()<br />
		{<br />
			FileStream outStream = new FileStream(sourceFile, FileMode.OpenOrCreate, FileAccess.Write);<br />
			try<br />
			{<br />
				SoapFormatter soapWriter = new SoapFormatter();<br />
				soapWriter.Serialize(outStream, qList);<br />
				outStream.Close();<br />
			}<br />
			catch(SerializationException sem)<br />
			{<br />
				outStream.Close();<br />
				Console.WriteLine(sem.ToString());<br />
			}<br />
<br />
			return true;<br />
		}<br />
<br />
		public bool SaveQuerys2()<br />
		{<br />
			try<br />
			{<br />
				ArrayList temp = new ArrayList();<br />
				temp.Add("howdy");<br />
				temp.Add("partner");<br />
<br />
				FileStream outStream = new FileStream(sourceFile, FileMode.OpenOrCreate, FileAccess.Write);<br />
				SoapFormatter soapWriter = new SoapFormatter();<br />
				soapWriter.Serialize(outStream, temp);<br />
			}<br />
			catch(SerializationException sem)<br />
			{<br />
				Console.WriteLine(sem.ToString());<br />
			}<br />
<br />
			return true;<br />
		}<br />
<br />
<br />
<br />
		/// <summary><br />
		/// The main entry point for the application.<br />
		/// </summary><br />
		[STAThread]<br />
		static void Main(string[] args)<br />
		{<br />
			QueryManager myQM = new QueryManager();<br />
			Query qi = new Query();<br />
<br />
			qi.name = "Query 1";<br />
			qi.description = "The first Query";<br />
			qi.SQL = "Selecr dfg dfg fdsfdsg gfds";<br />
			myQM.addQuery(qi);<br />
<br />
			qi.name = "Query 2";<br />
			qi.description = "The second Query";<br />
			qi.SQL = "Selecr dfg dfg fdsfdsg gfds";<br />
			myQM.addQuery(qi);<br />
<br />
			qi.name = "Query 3";<br />
			qi.description = "The third Query";<br />
			qi.SQL = "Selecr dfg dfg fdsfdsg gfds";<br />
			myQM.addQuery(qi);<br />
<br />
			<br />
<br />
<br />
			myQM.SaveQuerys();<br />
<br />
			//myQM.LoadFile();<br />
		}<br />
	}<br />
}<br />
<br />
<br />
<br />
<br />
<br />
/// <summary><br />
	/// A struct for storing query information<br />
	/// </summary><br />
[Serializable]<br />
public class Query : ISerializable<br />
{<br />
	/// <summary><br />
	/// The name of the query.<br />
	/// </summary><br />
	public string name;<br />
	/// <summary><br />
	/// A description of the query.<br />
	/// </summary><br />
	public string description;<br />
	/// <summary><br />
	/// The query string.<br />
	/// </summary><br />
	public string SQL;<br />
<br />
	public Query()<br />
	{<br />
	}<br />
<br />
	/// <summary><br />
	/// Constructor<br />
	/// </summary><br />
	/// <param name="qname">The name of the query.</param><br />
	/// <param name="qdesc">A description of the query.</param><br />
	/// <param name="qSQL">The query string.</param><br />
	public Query(string qname, string qdesc, string qSQL)<br />
	{<br />
		name = qname;<br />
		description = qdesc;<br />
		SQL = qSQL;<br />
	}<br />
<br />
	/// <summary><br />
	/// De-serializes a query object<br />
	/// </summary><br />
	/// <param name="serInfo">Holds all the data needed to serialize or deserialize an object</param><br />
	/// <param name="streamContext">The destination for this serialization.</param></param><br />
	public Query(SerializationInfo serInfo, StreamingContext streamContext)<br />
	{<br />
		name = serInfo.GetString("name");<br />
		description = serInfo.GetString("description");<br />
		SQL = serInfo.GetString("SQL");<br />
	}<br />
		<br />
	/// <summary><br />
	/// Prints the query's attributes to the console.<br />
	/// </summary><br />
	public void PrintInfo()<br />
	{<br />
		Console.WriteLine("name: " + name);<br />
		Console.WriteLine("description: " + description);<br />
		Console.WriteLine("SQL: " + SQL);<br />
	}<br />
<br />
	/// <summary><br />
	/// Populates a SerializationInfo with the data needed to serialize the target object.<br />
	/// </summary><br />
	/// <param name="serInfo">The SerializationInfo to populate with data. </param><br />
	/// <param name="streamContext">The destination for this serialization. </param><br />
	public void GetObjectData(SerializationInfo serInfo, StreamingContext streamContext)<br />
	{<br />
		serInfo.AddValue("name", name);<br />
		serInfo.AddValue("description", description);<br />
		serInfo.AddValue("SQL", SQL);<br />
	}<br />
}<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
[Serializable()]<br />
public class QueryList : IEnumerable, ICollection, ISerializable<br />
{<br />
	protected ArrayList TheQueryList;<br />
		<br />
	/// <summary><br />
	/// Default constructor.<br />
	/// </summary><br />
	public QueryList()<br />
	{<br />
		TheQueryList = new ArrayList();<br />
	}<br />
		<br />
	/// <summary><br />
	/// Called when de-serializing a QueryList object.<br />
	/// </summary><br />
	/// <param name="serInfo">Holds all the data needed to serialize or deserialize an object</param><br />
	/// <param name="streamContext">The destination for this serialization.</param><br />
	public QueryList(SerializationInfo serInfo, StreamingContext streamContext)<br />
	{<br />
		try<br />
		{<br />
<br />
			ArrayList aL = new ArrayList();<br />
			TheQueryList = (ArrayList)serInfo.GetValue("TheQueryList", aL.GetType());<br />
		}<br />
		catch(InvalidCastException e)<br />
		{<br />
			Console.WriteLine("Line 265: " + e.Message + "\n \n \n");<br />
		}<br />
	}<br />
<br />
	/// <summary><br />
	/// Adds a Query object to the query list<br />
	/// </summary><br />
	public int Add(Query QueryInfo)<br />
	{<br />
		return TheQueryList.Add(QueryInfo);<br />
	}<br />
		<br />
	/// <summary><br />
	/// Populates a SerializationInfo with the data needed to serialize the target object.<br />
	/// </summary><br />
	/// <param name="serInfo">The SerializationInfo to populate with data. </param><br />
	/// <param name="streamContext">The destination for this serialization. </param><br />
	public void GetObjectData(SerializationInfo serInfo, StreamingContext streamContext)<br />
	{<br />
		//serInfo.AddValue("TheQueryList", TheQueryList);<br />
		serInfo.AddValue("TheQueryList", TheQueryList.GetType());<br />
	}<br />
		<br />
	/// <summary><br />
	/// Returns an Query object<br />
	/// </summary><br />
	/// <param name="index">The index of the required Query object</param><br />
	/// <returns>null if the index is out of range, otherwise the required Query</returns><br />
	public Query getQueryAt(int index)<br />
	{<br />
		if(TheQueryList.Count < index)<br />
			return (Query) TheQueryList[index];<br />
		else<br />
		{<br />
			Query temp = new Query("Index out of range", "null", "null");<br />
			return temp;<br />
		}<br />
	}<br />
	<br />
<br />
	/// <summary><br />
	/// Creates an object with the provided parameters and adds it to the Query List.<br />
	/// </summary><br />
	/// <param name="name">The name of the query.</param><br />
	/// <param name="description">A description of the query.</param><br />
	/// <param name="statement">The query string.</param><br />
	/// <returns>The index that the query was added to</returns><br />
	public int Add(string name, string description, string statement)<br />
	{<br />
		Query sQI = new Query(name, description, statement);<br />
		return TheQueryList.Add(sQI);<br />
	}<br />
<br />
<br />
<br />
	/// <summary><br />
	/// This Property is the number of elements in the Array list<br />
	/// </summary><br />
	//ICollection.Count<br />
	public int Count<br />
	{<br />
		get<br />
		{<br />
			return TheQueryList.Count;<br />
		}<br />
	}<br />
		<br />
	//ICollection.IsSynchronized<br />
	public bool IsSynchronized<br />
	{<br />
		get<br />
		{<br />
			return TheQueryList.IsSynchronized;<br />
		}<br />
	}<br />
		<br />
	//ICollection.SyncRoot<br />
	public object SyncRoot<br />
	{<br />
		get<br />
		{<br />
			return TheQueryList.SyncRoot;<br />
		}<br />
	}<br />
<br />
	//ICollection.CopyTo<br />
	public void CopyTo(Array dest, int index)<br />
	{<br />
		TheQueryList.CopyTo(dest, index);<br />
	}<br />
<br />
	/// <summary><br />
	/// This Function clears all elements in the list<br />
	/// </summary><br />
	public void Clear()<br />
	{<br />
		TheQueryList.Clear();<br />
	}<br />
<br />
<br />
	//IEnumerable.GetEnumerator<br />
	public IEnumerator GetEnumerator()<br />
	{<br />
		return new QueryListEnumerator(TheQueryList);<br />
	}<br />
<br />
	//IEnumerator Class<br />
	public class QueryListEnumerator : IEnumerator<br />
	{<br />
		ArrayList TheQueryList;<br />
		IEnumerator TheEnumerator;<br />
<br />
		public QueryListEnumerator(ArrayList QLT)<br />
		{<br />
			this.TheQueryList = QLT;<br />
			TheEnumerator = QLT.GetEnumerator();<br />
		}<br />
<br />
		public object Current<br />
		{<br />
			get<br />
			{<br />
				return TheEnumerator.Current;<br />
			}<br />
		}<br />
<br />
		public bool MoveNext()<br />
		{<br />
			return TheEnumerator.MoveNext();<br />
		}<br />
<br />
		public void Reset()<br />
		{<br />
		}<br />
	}<br />
<br />
}

Question about inherited/custom control..

Randy Williams2-Jan-03 5:08

Randy Williams

2-Jan-03 5:08

Hello all, I'm fairly new to the C# and windows programming world, been stuck in the console too long..but anyways, im trying to write a collabseable groupbox type control, with a +/- in the top left of the groupbox, then allowing it to expand/collapse like a treenode..can anyone point me in the direction of where i need to start at? Thanks alot! ..i've read through alot of the tutorials but im still not sure on how i would make the list collapse and re-expand ..using OnPaint() i did have the +/- working with the MouseDown() event so that it changed from a + to a - correctly, but that was inheriting from System.Windows.Forms.GroupBox and using OnPaint() and OnMouseDown() ..thanks for any help you might be able to give me!

Re: Question about inherited/custom control..

leppie2-Jan-03 9:35

leppie

2-Jan-03 9:35

I suggest inheriting from UserControl and add a "bar" like panel at the top docked, and register the on onclick event to adjust the size of the control.

WebBoxes - Yet another collapsable control, but it relies on a "graphics server" for dynamic pretty rounded corners, cool arrows and unlimited font support.

Re: Question about inherited/custom control..

Randy Williams2-Jan-03 9:41

Randy Williams

2-Jan-03 9:41

Yep that's actually what I've ended up doing so far..Using a panel is there any reason i shouldn't be able to draw a borderline around the whole thing and then encase the text in the middle of that borderline, to pretty much emulate a groupbox? Thanks alot for your help!!

Architecture Design Advice

Bill West2-Jan-03 5:07

Bill West

2-Jan-03 5:07

I'm developing an application that charts data from an online real-time data vendor. I'd like to split the program into two main parts: 1) a server part that logs into and maintains the connection to the data feed, and 2) a charting/analysis part that charts and applies algorithms to the data.

The minimum requirement is once the server part is developed, I want to be able to: 1) login, 2) open a chart, 3) close the chart, 4) edit and recompile the charting code in visual studio without having to logoff. 4) open the chart again with the new edits operational.

The ideal senerio would be to not only stay logged on while editing and recompiling the charting code, but also not have to close the chart first. On recompile the edits would automatically be updated into the open chart.

It would seem that the server will need to be an exe and the charting a dll. In C# it looks like to accomplish dynamic loading and unloading of the charting dll, the charting dll will need to be in its own application domain.

I've studied Eric Gunnerson's MSDN article "AppDomains and Dynamic Loading" and this seems to be close to what I'm after. However his approach seems overly complex. I'm hoping to find a simpler way and hopefully some examples to implement my above stated minimum requirement and/or the ideal senerio.

Mark Clifton's Application Automation Layer also looks interesting.

Any thoughts/sugestions/examples would be greatly appreciated.

thanks,
Brian Dalby

Re: Architecture Design Advice

Anonymous2-Jan-03 10:08

Anonymous

2-Jan-03 10:08

If you need to unload and reload to the same type, the only way of doing it is with app domains.

You can sometimes get away with serializing the name of the type (chart1, chart2, chart3) when you modify it, and only load the new type. It's a bit ugly, however, and has more memory usage.

Re: Architecture Design Advice

leppie2-Jan-03 11:37

leppie

2-Jan-03 11:37

I have found that if you load an assembly from memory then later reload a new assembly with some changes, .NET will use you last loaded assembly as the reference. With no need to restart the app. I have successfully tested this. All thats required is to do some cleanup "after the user logs off" although the charting/plugin type assemblies ussually are small (and memory requirements small).

Assembly asm = null;

// the following replaces Assembly.LoadFrom()
FileStream stream = File.OpenRead(assemblydll.Text);
byte[] buffer = new byte[stream.Length];
stream.Read(buffer, 0, (int)stream.Length);
stream.Close();
asm = Assembly.Load(buffer);

Hope it helps Smile | :)

WebBoxes - Yet another collapsable control, but it relies on a "graphics server" for dynamic pretty rounded corners, cool arrows and unlimited font support.

Does C# have anything like JAVA Applets

Hudson2-Jan-03 4:35

Hudson

2-Jan-03 4:35

Hello,

For work I need to make a web based application.

I know JAVA applets will do what I want (this needs to be more like a windows prog and less like a web page)... does C# have anything like a JAVA applet???

Thanks,

Brian Hudson

Re: Does C# have anything like JAVA Applets

Michael P Butler2-Jan-03 4:43

Michael P Butler

2-Jan-03 4:43

SmartClients are good

http://msdn.microsoft.com/netframework/techinfo/articles/smartclient/[^]

Michael

Fat bottomed girls
You make the rockin' world go round -- Queen

Re: Does C# have anything like JAVA Applets

James T. Johnson2-Jan-03 17:06

James T. Johnson

2-Jan-03 17:06

Look up embedding .NET controls in a web page. It only works in IE 6, maybe in 5.x but I'm not sure.

Deploying a Runtime Application Using Internet Explorer[^]

James

"The elastic retreat rings the close of play as the last wave uncovers
the newfangled way.
But your new shoes are worn at the heels and
your suntan does rapidly peel and
your wise men don't know how it feels to be thick as a brick."
"Thick as a Brick" from Thick as a Brick, Jethro Tull 1972

Does something look goofy here?

Nick Parker2-Jan-03 4:25

Nick Parker

2-Jan-03 4:25

I am trying to create my first control and I don't understand what is going on, or why it isn't working. The control is simply going to paint a line through the center of a textbox. When I override the OnPaint method here, the MessageBox doesn't show up when I add the control to a test form and neither does the line, however everything compiles fine. Any suggestions? BTW, I am setting the property of the _borderlinecolor in the test example.

protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
{
         SolidBrush b = new SolidBrush(this._borderlinecolor);
	Pen p = new Pen(b, 2);
	p.Color = this._borderlinecolor;
	e.Graphics.DrawLine(p, 0, this.Height/2, this.Width, this.Height/2);
	MessageBox.Show("Hey, I just painted.");
}

Nick Parker

You see the Standards change. - Fellow co-worker

Re: Does something look goofy here?

Paul Riley2-Jan-03 4:55

Paul Riley

2-Jan-03 4:55

I had exactly the same problem with OnPaint and classes derived from TextBoxes; it simply doesn't seem to run it.

Never did figure out why, MS don't seem to want you to inherit from TextBox or RichTextBox, so there's no documentation. I think the answer is to inherit from TextBoxBase but I'm not 100% sure. I ended up selecting the text I wanted to highlight because it was an internal project and that was enough; I do intend to fix it at some point though.

Paul
Pleasently caving in, I come undone - Queens of the Stone Age, No One Knows

Re: Does something look goofy here?

Nick Parker2-Jan-03 5:00

Nick Parker

2-Jan-03 5:00

Paul Riley wrote:
I had exactly the same problem with OnPaint and classes derived from TextBoxes; it simply doesn't seem to run it.

Well, at least I am glad that I'm not the only having a problem with this.

Paul Riley wrote:
I think the answer is to inherit from TextBoxBase but I'm not 100% sure.

When I tried that I got this error:
System.Windows.Forms.TextBoxBase.TextBoxBase() is inaccessable due to its protection level

Thanks for the repsonse. Smile | :)

Nick Parker

You see the Standards change. - Fellow co-worker

Re: Does something look goofy here?

Stephane Rodriguez.2-Jan-03 5:01

Stephane Rodriguez.

2-Jan-03 5:01

Showing a messagebox in such functions is much like debugging code while having the current window DC handle on air. Read : this does not work.
I suggest to put text in the output console instead.

Also, be sure to call the OnPaint base class implementation.

Re: Does something look goofy here?

Nick Parker2-Jan-03 6:13

Nick Parker

2-Jan-03 6:13

S.Rod, thanks again, seems like I am running into brickwall after brickwall today. I made changes like you suggested and it looks like the following now, however I am still not getting anything even printed in the output console, any ideas?

protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
{
    SolidBrush b = new SolidBrush(this._borderlinecolor);
    Pen p = new Pen(b, 2);
    p.Color = this._borderlinecolor;
    e.Graphics.DrawLine(p, 0, this.Height/2, this.Width, this.Height/2);
    Console.WriteLine("I just painted....");
    base.OnPaint(e);
}

Nick Parker

You see the Standards change. - Fellow co-worker

Re: Does something look goofy here?

Stephane Rodriguez.2-Jan-03 6:25

Stephane Rodriguez.

2-Jan-03 6:25

I don't have .NET at work. Will look the details later tonight.

In the mean time, an obvious question : did you put a breakpoint in that ?

Re: Does something look goofy here?

Nick Parker2-Jan-03 7:14

Nick Parker

2-Jan-03 7:14

.S.Rod. wrote:
In the mean time, an obvious question : did you put a breakpoint in that ?

Yes, it seems as if it just doesn't work. I don't know, I think I am going to take a break for a few minutes and come back and look at it again. Thanks again.

Nick Parker

You see the Standards change. - Fellow co-worker

Re: Does something look goofy here?

James T. Johnson2-Jan-03 9:46

James T. Johnson

2-Jan-03 9:46

This is something that someone else had seen, Stan Shannon I think. The problem is that windows handles all of the painting for textboxes so the OnPaint method is never called.

There is a VB.NET article on control SubClassing using the NativeWindow class, I think that would give you the OnPaint method again.

Let me know if that works,

James

"The elastic retreat rings the close of play as the last wave uncovers
the newfangled way.
But your new shoes are worn at the heels and
your suntan does rapidly peel and
your wise men don't know how it feels to be thick as a brick."
"Thick as a Brick" from Thick as a Brick, Jethro Tull 1972

Re: Does something look goofy here?

RichiLloyd29-Sep-04 3:31

RichiLloyd

29-Sep-04 3:31

I'm experiencing exactly the same problem, has anyone found a solution for this yet??
Please let me know!

Many thanks!

Richard

how to ...

Max Santos2-Jan-03 2:35

Max Santos

2-Jan-03 2:35

Administer IIS and DNS with C# code?

Is there any COM objects or .NET classes for this kind of work?

thanks...

_______________________________
Portal Imoguia Software Imoguia
MSN:maxsnts@hotmail.com

how could i make my program support multilanguage.

Wang Kaiming1-Jan-03 22:53

Wang Kaiming

1-Jan-03 22:53

i want to make my program's User Interface more attractive and have multilanguage support, how could i make it?I'm a newbie so i need your help...

Re: how could i make my program support multilanguage.

Kannan Kalyanaraman1-Jan-03 23:32

Kannan Kalyanaraman

1-Jan-03 23:32

Multilanguage support or Localization as they call it in .net is a concept you need to understand completely. Here[^] is a good starting point.

Also look for Localization samples in framework sdk (it would be under Samples\Resources\resourcesandlocalization )

HTH

Cheers
Kannan

Re: how could i make my program support multilanguage.

Wang Kaiming3-Jan-03 1:41

Wang Kaiming

3-Jan-03 1:41

I find it really helpful.Thank you a lot!!

Cheers
doose

DirectX 9 C#

egon1-Jan-03 22:21

egon

1-Jan-03 22:21

Anyone tried using directx 9 and c#??
I downloaded the DX9 runtime and the DX SDK for c# but could get it to work
I found the DX assemblies on the harddrive but I couldn't find them in the
add reference list, also I couldn't add the manually by using browse.

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