C# Discussion Boards - CodeProject

Re: Struct vs array performance

User 665828-Jan-09 3:23

User 6658

28-Jan-09 3:23

SeMartens wrote:
So, let me guess writing [][] (Jagged array) refers to two "different" seperate arrays.

Actually, a jagged array [n][m] will create n*m arrays.

SeMartens wrote:
Then using the struct would be faster because you are only one array reference instead of two?

MSDN[^] writes a bit about performance of value and reference types. If value types have a lot of members, that it might be better to use a reference to this type using the ref keyword. Of course this is only applicable if you want to allow modification of the value type. Reference types have some GC overhead though.

modified 12-Sep-18 21:01pm.

Re: Struct vs array performance

C Change28-Jan-09 3:09

C Change

28-Jan-09 3:09

Not 100% cetain, but with modern processors and compilers there should be negligible odds. Any given structure is of constant size, and the offset into the structure for any given member is also constant. The array indexing is therefore trivial, and the member offsetting calculable at compile-time. e.g. If iterating in a for loop, it might typically add the struct size onto the index each time, which was originally primed with the address of the member variable in the initial array element.

Re: Struct vs array performance

Ennis Ray Lynch, Jr.28-Jan-09 4:02

Ennis Ray Lynch, Jr.

28-Jan-09 4:02

Do both array and stack :p

http://msdn.microsoft.com/en-us/library/cx9s2sy4(VS.71).aspx[^]

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xml data

arkiboys28-Jan-09 1:47

arkiboys

28-Jan-09 1:47

I have made changes to code with the help of another developer...
This code does not seem to be working fine when there are multiple <NODE> tags
Do you see what the problem is please?
The xml is below:
Thanks

XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load("XMLFile1.xml");

XmlNode bNode = xmlDoc.SelectSingleNode("BIBLE");

string strBibleClientID = xmlDoc.DocumentElement.GetAttribute("CLIENT_ID");
string strBibleMatterID = xmlDoc.DocumentElement.GetAttribute("MATTER_ID");
string strBibleDocNumber = xmlDoc.DocumentElement.GetAttribute("DOCNUMBER");

XmlNodeList nodes = xmlDoc.SelectNodes("/BIBLE/NODE");

foreach (XmlNode node in nodes)
{
XmlNodeList docs = node.SelectNodes("./DOC");

foreach (XmlNode doc in docs)
{
string clientID = doc.Attributes["CLIENT_ID"].Value;
string matterID = doc.Attributes["MATTER_ID"].Value;
string docName = doc.Attributes["DOCNAME"].Value;
string docNumber = doc.Attributes["DOCNUMBER"].Value;
}
}

<?xml version="1.0" encoding="utf-8" ?>
<BIBLE MATTER_ID="00123" CLIENT_ID="12345" DOCNUMBER="65476">
some text here
<DOC CLIENT_ID="12345" MATTER_ID="00123" DOCNAME="first Document name" DOCNUMBER="12346">
</DOC>
<NODE>
<![CDATA[some text:]]>
<DOC CLIENT_ID="12345" MATTER_ID="00123" DOCNAME="another name" DOCNUMBER="12346A">
</DOC>
</NODE>

<NODE>
<![CDATA[Authorisations:]]>
<NODE><![CDATA[something:]]>
<DOC CLIENT_ID="12345" MATTER_ID="00123" DOCNAME="second document name" DOCNUMBER="12347">
</DOC>
<DOC CLIENT_ID="12345" MATTER_ID="00123" DOCNAME="third document name" DOCNUMBER="12348">
</DOC>
</NODE>
</NODE>
<NODE>
<![CDATA[ok data:]]>
<DOC CLIENT_ID="12345" MATTER_ID="00123" DOCNAME="a name here" DOCNUMBER="12345">
</DOC>
</NODE>
</BIBLE>

Re: xml data

SeMartens28-Jan-09 1:51

SeMartens

28-Jan-09 1:51

Hi,

maybe you have to use "//DOC" instead of "./DOC"?

Regards
Sebastian

It's not a bug, it's a feature!

Check out my CodeProject article Permission-by-aspect.

Me in Softwareland.

Re: xml data

arkiboys28-Jan-09 2:01

arkiboys

28-Jan-09 2:01

Many thanks

UML Modelling of C# / .NET Windows Apps?

C Change28-Jan-09 0:28

C Change

28-Jan-09 0:28

I'm in the process of learning C#/.NET & UML, having previously done many years of embedded C/C++, with a smidgen of UML and VS6/MFC. I'm doing a home project, and can now at least put *simple* windows apps together. I want to now do a good object oriented design for a C# project - I've got Visual Paradigm for UML to help me here.

The problem I have is this: How best to model in an OOD the windows infrastructure elements of the design:-
* GUI components. Forms, buttons, text windows, etc etc.
* Event handlers. Being event-drive they just "pop up from nowhere" and then disappear again.
* How the underlying infrastructure knits it all together.

I can imagine that if I have a "PressMeHere" button, then it would be an object having a "PressMeHere_ButtonClick" event handler as one of its public methods, but it would be nice to see what it is in the system that invokes this method, and how the major .NET components interact.

Can anyone point me to a UML modelling of a typical .NET Windows application? Something that clearly identifies the demarcation between .NET/Windows infrastructure, versus application. I'd be very grateful if anyone can.

modified on Wednesday, January 28, 2009 9:10 AM

Downloadfile issue from server

ashok_rgm28-Jan-09 0:15

ashok_rgm

28-Jan-09 0:15

Hello All,

Here I have a problem with downloading a file.

I have a file "Sample.dat" of 600Mb in my IIS root directory.
Now I have a client application to download file to local drive.

am using DownloadFileAsync(URI,file);

it takes 2 mins to download the complete file but while downloading the file if delete the source file in server it is still getting downloaded, how is it possible?
Confused | :confused:

ashok

Re: Downloadfile issue from server

Manas Bhardwaj28-Jan-09 0:28

Manas Bhardwaj

28-Jan-09 0:28

ashok_rgm wrote:
it takes 2 mins to download the complete file

2 mins for 600 MB. Confused | :confused:

Please remember to rate helpful or unhelpful answers, it lets us and people reading the forums know if our answers are any good.

Re: Downloadfile issue from server

ashok_rgm28-Jan-09 0:54

ashok_rgm

28-Jan-09 0:54

It is in LAN..
ie,. I have configured my IIS to my IP, and downloading from different system in same network.

ashok

Re: Downloadfile issue from server

Aman Bhullar28-Jan-09 1:31

Aman Bhullar

28-Jan-09 1:31

You are not giving a URL to user for download.

But you are pushing a download to user.
In this case, file content is buffered in system memory and the content is pushed from memory only(not from disk).
Now if you delete the Source there will be no issue to one downloading the file.

how to do a multi task on a single button click

sandhya1427-Jan-09 23:53

sandhya14

27-Jan-09 23:53

Hi alll

I have a windows application using c# in framework 3.5(VS 2008)..

My starting page is Form1...i have put one ShowImage button in that..now on click of that ShowImage button 2 things should happen:

1.form1 should get closed

2. ShowImageForm should get opened

if i give

this.close();
Form Main1;
Main1 = new ShowImage();
Main1.Show();

the entire application is getting closed..

how can i do this?

Re: how to do a multi task on a single button click

rah_sin27-Jan-09 23:58

rah_sin

27-Jan-09 23:58

may be u can use this.hide();

rahul

Re: how to do a multi task on a single button click

sandhya1428-Jan-09 0:04

sandhya14

28-Jan-09 0:04

i have tried ...but no use... Frown | :-(

Re: how to do a multi task on a single button click

sandhya1428-Jan-09 0:20

sandhya14

28-Jan-09 0:20

ok..Thanks for ur fast reply... Smile | :)

...befor i tried that it ws giving an error...

now again i tried after,it worked well...

Re: how to do a multi task on a single button click

DaveyM6928-Jan-09 0:04

DaveyM69

28-Jan-09 0:04

Your application will close when the initial form closes.

Quick and dirty way is to call Hide instead of Close, call ShowDialog() for the new form and then call close on the initial form after that.

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)

Re: how to do a multi task on a single button click

sandhya1428-Jan-09 0:18

sandhya14

28-Jan-09 0:18

ok..Thanks for ur fast reply... Smile | :)

Re: how to do a multi task on a single button click

DaveyM6928-Jan-09 0:32

DaveyM69

28-Jan-09 0:32

Another way (I'm not too keen on this but in some ways is better) is to take control of the Application thread yourself.

The reason the application closes when your initial form does is because of the Application.Run(new Form1()); in the Main method of Program.cs.

If you show the form yourself before this line and then just call Application.Run(); the application then won't close until Application.ExitThread() is called.

This method is static so can be called from anywhere. Just make sure it is definately called from any place that should be able to close the program.

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)

how can i send file name to desktop application

ahmedhassan9627-Jan-09 23:51

ahmedhassan96

27-Jan-09 23:51

hi every body
i have desktop application which convert from mp3 to wav
i want to make all mp3 files in my pc have new item in it context menu which can open my application

and then i want the application receive the file name which open it to make convert

how can i do this ??

Re: how can i send file name to desktop application

Michael Bookatz28-Jan-09 0:17

Michael Bookatz

28-Jan-09 0:17

and this is a c# question how?? You do this using windows explorer file association or reg edits.

Re: how can i send file name to desktop application

ahmedhassan9628-Jan-09 0:42

ahmedhassan96

28-Jan-09 0:42

thanks for reply
but my question is how from my program recieve file name which open my program

Re: how can i send file name to desktop application

Michael Bookatz28-Jan-09 0:52

Michael Bookatz

28-Jan-09 0:52

sorry misunderstood you.

You need to look into using the args that is passed to the main function.

Loading vjslib dynamically

Gareth H27-Jan-09 22:49

Gareth H

27-Jan-09 22:49

I am using a 3rd party DLL that uses the J# runtime. If J# isnt installed, i get a FileIO exception. I want to be able to check when my program starts up if J# is installed, I think the best way is to load the assembly, if its found, then carry on, if not, notify the user.

I tried:

Assembly.Load("vjslib"); and Assembly.Load("vjslib.dll"); but both throw not found exceptions.

The below works fine, but that means the path is hard coded. Is it possible to get the DLL's location dynamically?

string path = "C:\\WINDOWS\\Microsoft.NET\\Framework\\v2.0.50727\\vjslib.dll";
Assembly assembly = Assembly.LoadFile(path);

Regards,
Gareth.

(FKA gareth111)

Re: Loading vjslib dynamically

Karmendra Suthar27-Jan-09 23:34

Karmendra Suthar

27-Jan-09 23:34

Just a thought, try if you can write a small search routine and search the dll in %systemroot%\\Microsoft.NET\\

If J# runtime is installed is it definite to have the dll in C:\WINDOWS\system32\? If yes use %systemroot%\\system32\\vjslib.dll

string path = "%systemroot%\\Microsoft.NET\\Framework\\v2.0.50727\\vjslib.dll";
Assembly assembly = Assembly.LoadFile(path);

regards
Karmendra

Re: Loading vjslib dynamically

Gareth H28-Jan-09 0:46

Gareth H

28-Jan-09 0:46

KSuthar,

That still doesn't get around the problem of having a hard coded path.

Regards,
Gareth.

(FKA gareth111)

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