C# Discussion Boards - CodeProject

udir3-Apr-05 5:05

3-Apr-05 5:05

Hi All,

I have to write a mathematics formula with lots of sin and cos fuctions. It is very inconvenient since I have to write system.math.sin/cos.

I know I can use the using keyword as followed :

using system.math to shortcut a little bit my method to math.sin/cos but it still annoying.

I know I can't but why can't I write the following

using sin = system.math.sin;<br />
using cos = system.math.cos;

???

Does anyone has an idea for a clean solution ??

thanks in advanced,

Udi Raz

Re: "using" keyword on methods

leppie3-Apr-05 7:28

leppie

3-Apr-05 7:28

You can only alias types, not members. I agree it would be nice, but I dont think the compiler could handle that. Anyways, in your class:

double cos(double a) { return Math.Cos(a); }
double sin(double a) { return Math.Sin(a); }

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Stupid problem

Static(x)3-Apr-05 4:21

Static(x)

3-Apr-05 4:21

Hi everybody ,
i have a problem , when i download any demo application or source codes from C# articles , windows tells me that it can't open this file(though i have installed Visual studio.net ) and asks me too choose program with which it will open it.

Whats wrong??

Regards

m0n0

Re: Stupid problem

udir3-Apr-05 4:55

udir

3-Apr-05 4:55

Are you using Visual .NET 2002 or 2003 ?

Udi Raz

Re: Stupid problem

ddmcr3-Apr-05 5:26

ddmcr

3-Apr-05 5:26

.net 2003

m0n0

uninstall program in C# ????

Anonymous3-Apr-05 2:38

Anonymous

3-Apr-05 2:38

hi all,

I hope any one can help me :

what is the classes in C# or API functions allow me to do uninstall my program from PC??

thanks.

Re: uninstall program in C# ????

Mike Dimmick3-Apr-05 8:49

Mike Dimmick

3-Apr-05 8:49

There aren't any.

You'll find the command line to uninstall an application in the registry in a key under HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall. The uninstall information is in a value named 'UninstallString'. Pass that to System.Diagnostics.Process.Start.

Stability. What an interesting concept. -- Chris Maunder

viewing local shell/system folders

nds53-Apr-05 0:27

nds5

3-Apr-05 0:27

Hi,
How can I browse through local shell folders such as the desktop and 'my computer' inside a treeview?
I have tried using SpecialFolders, but It only points me to the file folder compatable to the special folder, which does not contain all I need (e.g. the Desktop doesn't contain My Computer, and My Computer doesn't exist).
I want something like in the windows explorer - like the FolderBrowserDialog but not in a new window but inside a treeview, so I can handle this information on my own.
Thanks!

Re: viewing local shell/system folders

Milan20073-Apr-05 15:07

Milan2007

3-Apr-05 15:07

I think you are looking for the FolderTreeView[^] control.

Re: viewing local shell/system folders

nds57-Apr-05 1:28

nds5

7-Apr-05 1:28

Thank you! Smile | :)

how to get primary in variable

Member 17583712-Apr-05 16:58

Member 1758371

2-Apr-05 16:58

i am new in c# and i am having a problem in getting primary key value from table to a int variable
example

select user_id from user where login="dcds" ;

i need to store the user_id of this guy in a variable so i can use it for future so any one can tell me how to do this in asp.net using c#

thanks

Re: how to get primary in variable

theoutlander2-Apr-05 17:33

theoutlander

2-Apr-05 17:33

This is a long process .... I haven't worked with asp.net in a while but I am sure it is similar to this ...

make sure to specify using System.Data and using System.Data.SqlClient

SqlConnection connection = new SqlConnection(YOUR_SQL_CONNECTION_STRING);
/*
//EXAMPLE CONN STRING
workstation id=YOUR_MACHINE;packet size=4096;integrated security=SSPI;data source="YOUR_SQL_SERVER";persist security info=True;initial catalog=YOUR_DB
*/

connection.Open();

SqlCommand command = new SqlCommand("select user_id from user where login='dcds'");
command.Connection = connection;

SqlDataReader reader = command.ExecuteReader();
int Id = -1;

while(reader.HasRows)
{
reader.Read();
Object obj = reader["user_id"];
if(obj != null)
Id = Convert.ToInt32(obj);
}

Hope this helps ....

Shardool Karnik
Lead Software Engineer
Compass Technologies, Inc.
http://www.compasstec.com

Re: how to get primary in variable

Colin Angus Mackay3-Apr-05 1:52

Colin Angus Mackay

3-Apr-05 1:52

Seeing as he is only returning one row with only one column in it the ExecuteScalar() would be much more appropriate. So the code would become:

int id = (int)command.ExecuteScalar();

And there is no need to faff about with a SqlDataReader.

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Re: how to get primary in variable

theoutlander3-Apr-05 7:05

theoutlander

3-Apr-05 7:05

You are absolutely right ... I started off thinking that he wanted an entire row ...

LoadingForm issues

sniper506th2-Apr-05 7:45

sniper506th

2-Apr-05 7:45

Hi,
I have this segment of code, which is supposed to show a form (lf), and then when the user is done with that, show a loading form (load) until the main form is done loading (mf). This is what I have for my main function right now.

static void Main() 
		{

			LoginForm lf = new LoginForm();
			LoadingMainForm load = new LoadingMainForm();
			load.Show();
			load.Hide();
			lf.ShowDialog();
			if (lf.loggedin == true)
			{	
				load.Show();
				MainForm mf = new MainForm(lf.sessid,lf.loginform_username.Text);
				load.Hide();
				Application.Run(mf);
			}
			else
			{
				Application.Exit();
			}
		}

My problem is that when the loading form shows up, it looks incomplete. The title and stuff are still there, but in the place where a label and a button are supposed to be, it just looks incomplete, like the loading form didn't have enough time to load.

Can anyone help?

Thanks,

Jimmy Sawczuk
www.McJournal.org

Re: LoadingForm issues

Colin Angus Mackay2-Apr-05 12:58

Colin Angus Mackay

2-Apr-05 12:58

sniper506th wrote:
it just looks incomplete, like the loading form didn't have enough time to load.

Or receive a paint event - which is what I suspect is the real reason.

If a window is damaged (and in its initial state a window is damaged because it has yet to draw itself) a paint event gets put on the message queue. When the application is running the Application object processes the queue whenever the application is idle (and I guess that the modal dialogs process the message pump also which is why that would have worked). Since you have not yet told your application object to Run there is no processing of any events.

After showing the form, you could attempt a Refresh()[^] on it. The Refresh() method on the Form class should force an immediate repaint of the form area (including child controls, such as buttons and labels).

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Re: LoadingForm issues

sniper506th2-Apr-05 17:36

sniper506th

2-Apr-05 17:36

Thanks, I tried that and it worked perfectly.

Jimmy Sawczuk
www.McJournal.org

Re: LoadingForm issues

theoutlander2-Apr-05 17:24

theoutlander

2-Apr-05 17:24

You need to call Application.Run if you want to display a form.....it doesn't apply to a dialog. In your case you can pass the LoadingMainForm as a parameter to the Main form and display it in the constructor...hope this helps!

Shardool Karnik
Lead Software Engineer
Compass Technologies, Inc.
http://www.compasstec.com

Dictionary design time editor

rakat332-Apr-05 0:48

rakat33

2-Apr-05 0:48

There are several excellent examples here on how to define a collection property for your control and edit it with the collection editor in design time.

I've been trying to do the same with a dictionary collection (value and a key) but with no success. Any thoughts or ideas on how to edit a dictionary in design time without creating a completley costume designer?

Sleepy | :zzz:

is a good thing

Converting images to vedio using .NET

Member 15421422-Apr-05 0:06

Member 1542142

2-Apr-05 0:06

Hello , can any one help me PLEASE , how can I convert a series of images to any video format can be played by WindowsMediaPlayer?

Re: Converting images to vedio using .NET

MoustafaS2-Apr-05 5:07

MoustafaS

2-Apr-05 5:07

Try the DirectVedio in the DirectX redistrputable

Re: Converting images to vedio using .NET

C-codist2-Apr-05 5:10

C-codist

2-Apr-05 5:10

Several graphics packages offer software tools, such as Jasc Software's Paint Shop Pro - Animation Shop that can build animations, .avi, etc. from still images.

Mouse tracking

Member 15421422-Apr-05 0:03

Member 1542142

2-Apr-05 0:03

Hello, Does any one know how can I track mouse movements on other pc desktop connected with mine ?

Adding "missing" notifications to the ListView control (.NET 1.1)?

Uwe Keim1-Apr-05 23:09

Uwe Keim

1-Apr-05 23:09

Recently I wanted to port a CListCtrl-derived class (no offense please, it really was that poll-misused control[^] Wink | ;-)

).

I discovered that two notifications I subscribed to inside my MFC control were unavailable in the .NET ListView control: LVN_DELETEITEM and LVN_INSERTITEM.

Searching Google and CodeProject and even disassembling the BCL with Reflector, I found no example code that implemented (at least) those two notifications in .NET.

Questions:

Have I looked at the wrong places and there are actually already events in the current .NET 1.1 implementation for those notifications?
If not, is there some sample code available?

Thanks for your help!

[Update]
OK, I actually found some hints[^], which I already tried out, but I failed to map the index passed in that messages to the ListViewItems in the ListView.Items collection. Whenever I tried to access the Items[index] from inside the handler of the notifications, the collection was empty. Probably I handled the event too early, before the list view had a chance to fill its Items property properly...

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.NET on NT 4.0

G.Ringbom1-Apr-05 20:35

G.Ringbom

1-Apr-05 20:35

Is there anyone who has any experience with programming .NET applications for Windows NT 4.0? I have to make a network enabled application and I know that the server atleast runs NT 4.
Basically the server will have to be able to handle networking with sockets, threads for dealing with multiple clients and ADO.NET for dealing with a database. So if you have any experience at all about these parts or anything else on NT 4 please let me know if I have got myself into a lot of trouble by saying I could do this.
When I check the MSDN documentation for some of the classes I'm gonna need they all say they are supported on NT 4 so maybe I have just got scared totally unnecessary but I really need to know about problems that may arise.
Isn't the idea with the CLR and IL that an assembly would run on all supported operating systems with a working .NET framework, right? So basically there shouldnt be any problems?

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