C# Discussion Boards - CodeProject

3-Dec-04 19:24

hello i have a custom control with 2 buttons i need the control the raise an event with the parent only when 1 of the buttons is pressed. what is the proper way to do this?
any suggestions or a link to an article will be helpfull
thanks

Stanciu Vlad3-Dec-04 23:05

3-Dec-04 23:05

You should make a custom event handle to your control.
The way to do this is to create a delegate and a evet handle to you control like this

public delegate void ControlButtonPressedHandle(object sender, EventArgs e);
public event ControlButtonPressedHandle ButtonPressed;

and then create a method that invokes all your delegates

protected virtual void OnButtonPressed(EventArgs e)
{
    if (ButtonPressed != null) 
	ButtonPressed(this, e);
}

Once you have done al this you can add a delegate to you button to rise when it is clicked and invoke all you custom control delegates

private void button1_Click(object sender, System.EventArgs e)
{
    OnButtonPressed(new EventArgs());
}

Finaly your control now has a button pressed delegate.
Hope this helps you.

I hope you understand...
By the way... visit http://nehe.gamedev.net[^]

Anonymous4-Dec-04 7:57

4-Dec-04 7:57

and how would i use this to notify the parent that this happened?

Stanciu Vlad4-Dec-04 8:14

4-Dec-04 8:14

into the paren constructor add the following

myControl.ButtonPressed += new ControlButtonPressedHandle(myFunction);

and into it's class add the following function

void myFunction(object sender, EventArgs e) {
   // treat here what ever you want
}

this is what a delegate is for Smile | :)

I hope you understand...
By the way... visit http://nehe.gamedev.net[^]

Robert Rohde4-Dec-04 8:32

Robert Rohde

4-Dec-04 8:32

I agree with you but why make your own delegate when you can use the normal EventHandler?

Anonymous4-Dec-04 9:01

4-Dec-04 9:01

i dont know what your talking about im using multiple buttons in a control and i only want the event to happen when a specific button is pressed

Stanciu Vlad4-Dec-04 9:28

4-Dec-04 9:28

lol in that case double click on the button in the designer Smile | :)

and write there your code

I hope you understand...
By the way... visit http://nehe.gamedev.net[^]

Stanciu Vlad4-Dec-04 9:30

What are the good practises to write an complicate application?

4-Dec-04 9:30

i used my own delegate because in my opinion it makes the code more inteligible, easier to understand when it evolves into a mass of characters that nobody can understand Smile | :)

(not even me sometimes)

I hope you understand...
By the way... visit http://nehe.gamedev.net[^]

ting6683-Dec-04 17:49

ting668

3-Dec-04 17:49

Hi
Programmers likes dividing their code to several DLL. However, is there any rules to divide the code? By function, by class or by other factors?

Thanks

Re: What are the good practises to write an complicate application?

Daniel Turini3-Dec-04 19:16

Daniel Turini

3-Dec-04 19:16

ting668 wrote:
However, is there any rules to divide the code?
Yes:
1. When something is reused, it goes to a DLL.
2. When something needs to hide classes, data and references to other DLLs, it goes to a DLL. E.g., Data Access Layers - we have a rule where no project but the DAL should use a SqlConnection or an OracleConnection. When classes or data need to be hidden, but public to an assembly, we use the 'internal' keywork and put it on a DLL.
3. When the project is mature (i.e., we're on the optimization phase) and something is slow to load, and will not be used on the application startup, it goes to a DLL.

Yes, even I am blogging now!

Re: What are the good practises to write an complicate application?

Anonymous3-Dec-04 19:18

Re: What are the good practises to write an complicate application?

3-Dec-04 19:18

you only use dlls if you wanna reuse that specific code and share it among more than one program and the rules varry depending on how you want the dll to be used you may for instance want to make some sort of graphics dll with might include several classes or you may just want a single class in your dll such as a simple custom control that you share between a few programs. they are also usefull if you want to update only specific portions of your software without updating the entire release. sometimes it may just be simpler to contain all your code within a single .exe file as it makes installtion easier becuase dlls need to be registered with the os and the more seperate compenents your program has to deal with the greater potential for error/corruption as well as problems with updating a dll and breaking the code in your exe known as "DLL HELL". i hope this helps

Daniel Turini3-Dec-04 23:02

Daniel Turini

3-Dec-04 23:02

Anonymous wrote:
becuase dlls need to be registered
Not on .NET.

Yes, even I am blogging now!

Re: What are the good practises to write an complicate application?

Robert Rohde4-Dec-04 8:34

Robert Rohde

4-Dec-04 8:34

Yes, right!
What is the simplest installer for .NET?

-> Ctrl-C Ctrl-V

string to int

John L. DeVito3-Dec-04 17:29

John L. DeVito

3-Dec-04 17:29

heyas all,

pretty simple question I would imagine...

<br />
static void Main(string[] args)<br />
{	<br />
  int input = Console.ReadLine();<br />
<br />
  whatTime(input);<br />
}<br />

Where the prototype for whatTime is:
public string[] whatTime(int);

How would I get this to work? I tried an explicit cast, but it didn't
like that neither.

help please? Smile | :)

thanks all!

"There are 10 types of people in this world; Those that know binary and those that do not."

Re: string to int

Charlie Williams3-Dec-04 18:12

Charlie Williams

3-Dec-04 18:12

Int32 has a Parse method that takes a string parameter or you can use the ToInt32 method of the System.Convert class.

Both will throw a FormatException if the string cannot be parsed (including empty strings), or an OverflowException if the value is < Int32.MinValue or > Int32.MaxValue. Int32.Parse will throw an ArgumentNullException if a null value is passed, whereas Convert.ToInt32 will return 0.

Charlie

if(!curlies){ return; }

Re: string to int

John L. DeVito3-Dec-04 18:18

John L. DeVito

3-Dec-04 18:18

ahh perfect, thanks charlie! Smile | :)

"There are 10 types of people in this world; Those that know binary and those that do not."

help...

tom_dx3-Dec-04 14:01

tom_dx

3-Dec-04 14:01

is .net assembly quicker than assembly i doubt it but im still having thoughts..

IM PROUD TO BE A GMAIL;

Daniel Turini3-Dec-04 19:11

Daniel Turini

3-Dec-04 19:11

Theoretically, it could be, as ASM code would be fixed for a single machine and use profile, while .NET IL code could auto-adjust to conditions on machine that would be detected on application startup.
In practice, .NET IL code is several times slower (tipically 5~100 times) than hand-made ASM code.

Yes, even I am blogging now!

Alex Korchemniy3-Dec-04 21:10

Alex Korchemniy

3-Dec-04 21:10

Even in theory i don't think that it could be. Out of interest what is your argument for that?

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

Alex Korchemniy

Robert Rohde4-Dec-04 8:38

Robert Rohde

4-Dec-04 8:38

The standard arguments for that are, that the JIT could build asm code specific to the hardware the program is running on, like processor architecture, cache size and even transfer some calculations to the graphic card etc...
But I also think this will never happen, because the JIT would have to be 100x more intelligent than the best c compilers of today.