So simple question for C# user ??

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calderara - 30 Apr 2007 21:34 GMT

Dear all,

Until now I was programing for more that 6 years using VB.net simply because
I come from that word and used to. Now I need to switch to C# simply because
my customer want its project in that language. So now I am fighting with so
simple thing like raising a simple event as follow, and have a complie error,
with no damn idea what this compiler want.

The code is as follow

------>

namespace ConsoleApplication1
{
public delegate void dg_Startup();

class Program
{

public event dg_Startup StartupComplete;

static void Main(string[] args)
{
Console.WriteLine("Initiliastion");
Console.Write("completetd...");
StartupComplete;
Console.ReadLine;
}

}

}
<-------

The two last line of my main are highligtied with error saying :

Error    1    Only assignment, call, increment, decrement, and new object
expressions can be used as a statement    D:\Users\Serge\Documents\Visual Studio
2005\Projects\WindowsService1\ConsoleApplication1\Program.cs    18    10    ConsoleApplication1

Error    2    An object reference is required for the nonstatic field, method, or
property
'ConsoleApplication1.Program.StartupComplete'    D:\Users\Serge\Documents\Visual
Studio
2005\Projects\WindowsService1\ConsoleApplication1\Program.cs    18    10    ConsoleApplication1

Thnaksa for help
serge

Reply to this Message

Page Brooks - 30 Apr 2007 21:43 GMT

Calderara,
Try something like this:

class Program
{

static void Main(string[] args)

{

MyClass mc = new MyClass();

mc.StartupComplete += new MyClass.dg_Startup(mc_StartupComplete);

mc.Start();

}

static void mc_StartupComplete()

{

Console.WriteLine("Startup Complete");

}

}

...
...
...

public class MyClass
{

public delegate void dg_Startup();

public event dg_Startup StartupComplete;

public void Start()

{

if (StartupComplete != null)

StartupComplete();

}

}

...

Signature

Page Brooks
www.explosivedog.com

> Dear all,
>
[quoted text clipped - 53 lines]
> Thnaksa for help
> serge

Reply to this Message

calderara - 30 Apr 2007 22:00 GMT

hi thanks for your reply...
Could you explain a bit...

What i understand here is that you need to create a new class to raise an
event that you have decared on an other one ?

I am just writeing a test console application on witch I have delcare a
delegate for that event then during the main function, which is in a way the
initliasation oart I just need to raise it at that time !!
Juts for this we need to creat an extra class ?

regards
serge

> Calderara,
> Try something like this:
[quoted text clipped - 106 lines]
> > Thnaksa for help
> > serge

Reply to this Message

calderara - 30 Apr 2007 22:02 GMT

IN fact I simply want to creat a class which raise an event.
Then from an other assembly I will register to that event and catch it.

So in my test, the smal console app should only raise the event for others
which are register to it..

???
serge

> Calderara,
> Try something like this:
[quoted text clipped - 106 lines]
> > Thnaksa for help
> > serge

Reply to this Message

Jon Skeet [C# MVP] - 30 Apr 2007 23:02 GMT

> Until now I was programing for more that 6 years using VB.net simply because
> I come from that word and used to. Now I need to switch to C# simply because
> my customer want its project in that language. So now I am fighting with so
> simple thing like raising a simple event as follow, and have a complie error,
> with no damn idea what this compiler want.

Brackets, that's all, and a using statement at the start -

using System;

...
StartupComplete();
Console.ReadLine();

After that, you've just got two more issues:
1) You're accessing StartupComplete from within a static method, but
it's an *instance* event (and therefore an instance field has been
created)

2) StartupComplete(); will throw a NullReferenceException if nothing
has subscribed to it.

Signature

Jon Skeet - <skeet@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

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So simple question for C# user ??

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