C# Discussion Boards - CodeProject

Ivan Fernandez3-Dec-04 1:43

3-Dec-04 1:43

I would like to know the differences between deriving from Control or UserControl when you are building a custom control.

I know that is easier to create if you use UserControl because you can drag&drop (like into a form) but, is there any other difference? I am particularly worried about run & design time.

Thanks in advance.

Ivan.

Iván Fernández

calculation during compile time

dkoder3-Dec-04 1:21

dkoder

3-Dec-04 1:21

hello!

could someone please point out how I can tell the compiler to calculate (say a sin wave lookup table) during compile time?

many thanks in advance, Dominik

Re: calculation during compile time

Felix Cho3-Dec-04 1:45

Felix Cho

3-Dec-04 1:45

You probably have to write a separate program and use pre- or post- build events to call that program. That means the program should be command line (Console).

Adding attributes to inherited members

Paul Watson3-Dec-04 0:51

Paul Watson

3-Dec-04 0:51

I have a Base class which is inherited by XYZ.

An app of mine uses reflection to inspect XYZ and bind it's public properties to a PropertyGrid control (awesome control BTW.)

Some of the public properties in XYZ have the Browsable attribute set to false so that the PropertyGrid won't pick them up.

However the Base class has some public properties which I don't want the PropertyGrid to pick up on either. I cannot modify this Base class.

How can I add the Browsable attribute to these inherited members from within XYZ?

The members in question are not virtual, abstract or overridable.

regards,
Paul Watson
South Africa

Michael Dunn wrote:
"except the sod who voted this a 1, NO SOUP FOR YOU"

Crikey! ain't life grand?

Re: Adding attributes to inherited members

Daniel Turini3-Dec-04 1:02

Daniel Turini

3-Dec-04 1:02

I believe that something like this[^] may solve your problem. Search about PreFilterProperties to learn more.

Yes, even I am blogging now!

Using FTP

Member 10976992-Dec-04 22:50

Member 1097699

2-Dec-04 22:50

Hi all,
I developed application in VC++ 6.0 about gets file in the FTP server using CFtpConnection class. What class is similar it in C#.

Thanks for your help.

Re: Using FTP

Daniel Turini3-Dec-04 1:05

Daniel Turini

3-Dec-04 1:05

batman < binhpt.evnit@evn.com.vn > wrote:
What class is similar it in C#.
None. The .NET framework doesn't offer FTP support (IMO, a big omission). You'll need some FTP library, and there are lots of free FTP libraries out there, some of them here at CP.

Yes, even I am blogging now!

Re: Using FTP

Alex Korchemniy3-Dec-04 3:25

Alex Korchemniy

3-Dec-04 3:25

It probably would have been a good idea to have it in a seperate assembly (not everyone needs FTP support so no point in bloating the main assemblies)

This posting is provided "AS IS" with no warranties, and confers no rights.

Alex Korchemniy

Passing data from a static method?

DaLLe1232-Dec-04 21:24

DaLLe123

2-Dec-04 21:24

Hi,
How will I be able to pass data I get back in a static Callback to a parameter in the same form-class?

public class TestForm : System.Windows.Forms.Form
{
public sting result;
...
...
public static void ParseResult(IAsyncResult arResult)
{
//This is what I want to do but it doesn't work!
this.result = "test!";

}
...
...
}

/Dalle

Re: Passing data from a static method?

Vector72-Dec-04 22:53

Vector7

2-Dec-04 22:53

wrong variable declaration

public static string result;

Re: Passing data from a static method?

DaLLe1232-Dec-04 23:00

DaLLe123

2-Dec-04 23:00

Tanks!

Re: Passing data from a static method?

Stefan Troschuetz2-Dec-04 23:04

Stefan Troschuetz

2-Dec-04 23:04

I'm not very familiar with asynchronous execution but I think the following should work:
When beginning the asynchronous call pass the actual instance of TestForm as state object and retrieve it in the callback by using the IAsyncResult.AsyncState property.

www.troschuetz.de

system notification in Window

ppp0012-Dec-04 20:35

ppp001

2-Dec-04 20:35

Hi all,

I am writing a program that can notify users of certain event
by showing up a pop up window of the notifying message on the
desktop. The notification can be set to be triggered at a preset time.
The notification message can be triggered even that the program is not running, once it is set to be triggered at certain time by the program and then the program is shutdown. Is it possible ?

Thanks
Patrick

Re: system notification in Window

Sebastian Schneider3-Dec-04 1:13

Sebastian Schneider

3-Dec-04 1:13

There are obviously 2 ways to do it (or there are 2 I know of).

You could use the Windows-Scheduler and have it start a program at a certain time. That program could then "notify" the user.

Or you could create a little "Taskicon"-Application which would be launched by the program and do your notification.

Basically, that is the way Real (RealScheduler/RealPlayer), ICQ and others do it: they have a small app running, which reacts to certain events.

Cheers
Sid

I want a two dimensional matrix of boxes on my fom.

Anonymous2-Dec-04 19:37

Anonymous

2-Dec-04 19:37

Venerable sir,.

I want a two dimensional matrix of boxes on my fom. what is the best way to do this ?. Also I need to add some text to each box and these boxes must be accessible from any button click event ? Please response to this thread as soon as possible.

thank you,

Re: I want a two dimensional matrix of boxes on my fom.

Dave Kreskowiak3-Dec-04 4:50

Dave Kreskowiak

3-Dec-04 4:50

By your requirements, there's nothing special here. All you do is drag the boxes you want onto the form and arrange them how you want. All the properties and methods of the boxes are available to any code behind any of the controls on the form after that.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

XP/2003 Icons

Brendan Vogt2-Dec-04 19:33

Brendan Vogt

2-Dec-04 19:33

Where can I get Windows XP and Office 2003 graphic icons which I need to use in my application?

Brendan

Re: XP/2003 Icons

Tom John3-Dec-04 2:47

Tom John

3-Dec-04 2:47

It's against MS copyright to do that I am afraid. All you are allowed to used them in is training documentation in their original context:

http://www.microsoft.com/permission/copyrgt/cop-img.htm#Icons[^]

Cheers

Tom

int casting does not behave with Math.Round with NaN?

Felix Cho2-Dec-04 19:24

Felix Cho

2-Dec-04 19:24

Found a weird bug in an app that we are writing, and I narrowed down to this special case:

<br />
	double a = double.NaN;<br />
	Console.WriteLine("a = {0}", a);<br />
	Console.WriteLine("(int)a = {0}", (int)a);<br />
	Console.WriteLine("Math.Round(a) = {0}", Math.Round(a));<br />
	Console.WriteLine("(int)Math.Round(a) = {0}", (int)Math.Round(a));<br />

We just moved to 1.1 so this appears to be a 1.1 issue.

For debug build, the output is:

<br />
a = NaN<br />
(int)a = 0<br />
Math.Round(a) = NaN<br />
(int)Math.Round(a) = 0<br />

For release build, the output is:

<br />
a = NaN<br />
(int)a = 0<br />
Math.Round(a) = NaN<br />
(int)Math.Round(a) = -2147483648<br />

It seemed for some reason Release does not behave the same and that was causing my problem. Granted I shouldn't depend on the cast to be 0 because it is NaN (should never depend on undefined behaviour Poke tongue | ;-P

), but at least give me a consistent answer or throw an exception if NaN is used in Math.Round()?

Again when my runtime was 1.0 it seemed fine, so could this be just a weird bug? Confused | :confused:

Re: int casting does not behave with Math.Round with NaN?

Felix Cho3-Dec-04 4:43

Felix Cho

3-Dec-04 4:43

Correction: I have verified and this happens on both 1.0 and 1.1. Looks like an issue that no one has noticed before? Wink | ;)

Re: int casting does not behave with Math.Round with NaN?

Dave Kreskowiak3-Dec-04 5:02

Dave Kreskowiak

3-Dec-04 5:02

Since Nan is not a real number, I wouldn't expect int casting to work predictably anyway. The easiest way around it is to check if a IsNaN before attempting the Round and int cast operations.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

How Can I have an Label Control array of two dimensional On form.

Anonymous2-Dec-04 19:08

Anonymous

2-Dec-04 19:08

Venerable Sir.,

How can I have any array of Labels on windows form? If I could Can I change them at form design ? Please any one knows kindly explain to me with example code.

Thank you,

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.