Re: alot of questions - C# Discussion Boards

26-Oct-03 12:28

Well, now that the 2.0 specs are out (a few days ago) and I'm sure we all read them ( right? Mad | :mad:

), I'm curious how they'll introduce the base class libraries with generic support. I mean, it's pretty obvious the BCL was written in C# so while IL apparently supports generics, C# didn't and so the BCL didn't include generics...right?

So, upon the introduction of generics, how will this affect VB.NET and other languages targeting the CLR? Will inference be relied upon for forward compatibility with apps compiled against older libraries running against the new ones, or will they simply just be cut-off? Frankly, I'm a little leary of simply relying on inference for forward compatibility.

In any case, and perhaps someone can correct me, I'm curious why they didn't extend generics to allow interfaces to force certain constructors. Perhaps this okay, though. ISerializable wants a ctor that takes two params (everyone should know what they are) but it doesn't have to be public, limiting access by compilers ( and coders that rely only such compilers and...dare I say it...IntelliSense! Dead | X|

).

So, what's everyone else's thoughts? If you're a n00b, I highly suggest you at least read the C# specifications at http://msdn.microsoft.com/vcsharp/team/language/default.aspx[^].

-----BEGIN GEEK CODE BLOCK-----
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GCS/G/MU d- s: a- C++++ UL@ P++(+++) L+(--) E--- W+++ N++ o+ K? w++++ O- M(+) V? PS-- PE Y++ PGP++ t++@ 5 X+++ R+@ tv+ b(-)>b++ DI++++ D+ G e++>+++ h---* r+++ y+++
-----END GEEK CODE BLOCK-----

jparsons26-Oct-03 14:46

jparsons

26-Oct-03 14:46

Heath Stewart wrote:
Well, now that the 2.0 specs are out (a few days ago) and I'm sure we all read them ( right? ), I'm curious how they'll introduce the base class libraries with generic support. I mean, it's pretty obvious the BCL was written in C# so while IL apparently supports generics, C# didn't and so the BCL didn't include generics...right?

System.Collections.Generic Smile | :)

Heath Stewart wrote:
In any case, and perhaps someone can correct me, I'm curious why they didn't extend generics to allow interfaces to force certain constructors

They did to a small extent with the new() specification. But it would have been nice to be able to say new(typeof(Int32)) and such.

Jared
jparsons@jparsons.org
www.prism.gatech.edu/~gte477n

Heath Stewart26-Oct-03 17:26

26-Oct-03 17:26

Where did you see the namespace reference? Did I pass over it in the specs (though I wouldn't expect to find it there). I've been reading several things about it on MSDN (and now the specs) and have seen much about what to expect (other than the language changes).

jparsons28-Oct-03 6:34

jparsons

28-Oct-03 6:34

There wasn't one in the specs as far as I can tell. It just seems like a logical conclusion to the problem.

Jared
jparsons@jparsons.org
www.prism.gatech.edu/~gte477n

jparsons28-Oct-03 6:36

jparsons

28-Oct-03 6:36

Also check out this link. http://wesnerm.blogs.com/net_undocumented/2003/10/official_c_20_s.html

Jared
jparsons@jparsons.org
www.prism.gatech.edu/~gte477n

Kevin McFarlane27-Oct-03 5:34

Kevin McFarlane

27-Oct-03 5:34

Heath Stewart wrote:
So, upon the introduction of generics, how will this affect VB.NET and other languages targeting the CLR?

VB .NET is also slated to include generics. I don't know how the introduction of generics will affect other languages, such as Eiffel .NET, that already implement generics on .NET 1.x. Presumably they will have to rework their implementation to be compatible?

Kevin

alot of questions

bora3ee26-Oct-03 12:20

bora3ee

26-Oct-03 12:20

hii all...
i'm working on an application that preview the current processes on the machine and the state of the process (responding or not responding) and the memory used by the process (something like task manager)
i'm using a listbox to preview the processes
so i have some questions...
1- how can i allow columns??...(one column for the process name and one for the memory used and one for the state and so on)all the information about each process is in the same row the row is divided into columns..
2-i wanna the listbox to disply the changes in the memory used eah 1 sec how can i do it (i tried to redraw the listbox each second but i found it sucks)
3-i used the following code to display the process name and its state :
private static Process[] processes=Process.GetProcesses();
for(int x=0;x

Re: alot of questions

Heath Stewart26-Oct-03 17:39

System.Web.Mail -> missing

26-Oct-03 17:39

You really should read the class documentation. ListView subitems are definitely explained clearly enough.

bora3ee wrote:
1- how can i allow columns??...(one column for the process name and one for the memory used and one for the state and so on)all the information about each process is in the same row the row is divided into columns..

Set ListView.View to View.Details. Add columns using the ListView.Columns properties.

bora3ee wrote:
2-i wanna the listbox to disply the changes in the memory used eah 1 sec how can i do it (i tried to redraw the listbox each second but i found it sucks)

You either have to derive from ListView and handle the OCM_NOTIFY messages to have the NM_CUSTOMDRAW notifications, or handle the WM_NOTIFY in the parent of the ListView, handling the specific (and many) NM_CUSTOMDRAW notifications. This requires P/Invoking several Win32 functions from the Platform SDK and redefining a lot of message IDs and structures. This isn't for newbies, but there are lots of tutorials here on CP (which you should always check for first, since that's the whole point of this site).

You can then control which items and subitems are redrawn and when.

bora3ee wrote:
3-i used the following code to display the process name and its state :
private static Process[] processes=Process.GetProcesses();
for(int x=0;xlistBox1.Items.Add(processes[x].ProcessName.ToUpper().ToString()+"\t\t\t"+(processes[x].Responding ?"Running" :"NotResponding"));

??? WTF | :WTF:

There's no different in your output. Check your HTML formatting.

bora3ee wrote:
4- how can i display only current applications not processes???

Applications == processes. Please elaborate. If you want to see current Windows applications / processes, you enumerate the processes and check the Process.MainWindowHandle. If it's IntPtr.Zero, it doesn't have a GUI associated with it (no main Window handle). If the return isn't IntPtr.Zero, it's a Windows application.

In the future, it would also be easy to get help if you post these questions as separate posts. You're more likely to get help with at least some of them and it's easier for potential helpers to follow along and reply when necessary.

totig26-Oct-03 11:13

totig

26-Oct-03 11:13

Hi
I have VS 2003. However, I do not appear to have the System.Web.Mail namespace. Does anyone know how to get this, or where to download it from? It appears it should be there, as I cant find a download for it on Microsoft.com, yet a lot of their examples use it.

Thank you

Re: System.Web.Mail -> missing

Heath Stewart26-Oct-03 12:11

C# Class Library and VS.NET standard

26-Oct-03 12:11

By saying that a "namespace is missing", you're implying that you don't have the right assemblies referenced. In a project, you can't just include namespaces in your source files and call it good. The project has to reference the right assemblies that contain those namespaces. So, in your VS.NET project, right-click and select Add Reference. Find the System.Web assembly and add it as an assembly reference.

This is no different than any other API / framework. In C++ you have to bind to a static lib or DLL to call a function in there. In PERL, you have to use the right mod, and in VB - right TLB.

ewan26-Oct-03 8:18

26-Oct-03 8:18

Hi All,

Could anybody point me in the right direction of how to create a class library using C#.NET 2002 standard edition? As it does not have a project template for creating a class library I am finding it difficult to find the right incantation. Any help would be appreciated? (I am assuming this is actually possible.... Wink | ;-)

)

Cheers,

Ewan.

Blake Coverett26-Oct-03 8:28

Blake Coverett

26-Oct-03 8:28

Step 1) Run notepad.
Step 2) Type: class MyLibrary { public void Foo() {} }
Step 3) Save file as "MyLibrary.cs"
Step 4) Compile with: csc /t:library MyLibrary.cs

Presto, you have a class library in MyLibrary.dll, add it as a reference, call it from anywhere, all that good stuff.

(I'm sure someone else will come along and tell you which buttons to push and checkboxes to change.)

-Blake

ewan26-Oct-03 8:36

26-Oct-03 8:36

Thanks,

Not really answering the question I asked tho: How do I create it in VS.NET 2002. Not notepad? I.e. where is the setting where I tell the IDE that I want the command line compile option /t:library

Thanks,

Ewan.

Blake Coverett26-Oct-03 8:43

Blake Coverett

26-Oct-03 8:43

ewan wrote:
Not really answering the question I asked tho

I know. I'm one of those crotchety old farts who thinks relying on templates and wizards and such weakens the mind.

The "VS.NET IDE issues" forum is five lines down. I don't tease people there. Wink | ;)

-Blake

ewan26-Oct-03 8:46

26-Oct-03 8:46

Hehehe

No problem. Can't say I blame you Wink | ;-)

Am very new to .NET environment having done lots in VC++ 6. Can't say the transition is going well Wink | ;-)

Ta

Ewan.

Heath Stewart26-Oct-03 12:18

26-Oct-03 12:18

While I'm with Blake on this one, I will tell you that C# projects actually come in two varieties: ASP.NET and not. For the "not", you can easily change the target type by right-clicking on the project and selecting "Class Library".

Don't forget to the read the documentation and explore a little, otherwise you'll never amount to anything more than a code monkey. Would you spends thousands of $$$ at a university without cracking a book, or take-off in a brand new jet without reading the product instructions and features? Why do so with a framework or IDE (remember, VS.NET is just a development environment).

And exploration is also important - if people didn't explore all 6 billion of us would be stuck around Iran and Iraq were humanity apparently started and we be as dumb as al Qa...er, rocks!

ewan26-Oct-03 21:47

26-Oct-03 21:47

I think you are slightly missing the point. Personally when I approach a problem and find a stumbling block I do the following:

1) Read the documentation.
2) If the answer isn't forthcoming (as it really isn't in this case) (oh and your answer is plain wrong btw for the standard edition) ask someone who likely has far more knowledge than I will every have on the subject.

Result.... almost immediate answer (plus obligatory flaming).

I've coded in c++ for many years and while I am certainly a code monkey at heart I would like to think I do amount to something Wink | ;-)

. Just because I'm trying to expand my knowledge in the form of c# shouldn't mean I have to read the entire MSDN before I'm entitled to ask questions.

Ewan.

Heath Stewart27-Oct-03 2:04

27-Oct-03 2:04

Sorry, "right-click on the project, select properties, and select "Class Library". Should be obvious since it's consistent with everything else in Windows, and I was able to find it in the MSDN Library in under a minute by following a natural chain of topics, like ".NET Development"/"Visual Studio .NET"/"Product Documentation"/ etc.

Besides, "coding" does not make a developer. Good research skills are important. And while forums like this are here to help, even exploration of the UI at the very least should've uncovered this. You're right, sometimes the documentation isn't so obvious, but by exploring you certainly learn a lot more. And while some will read the MSDN Library thoroughly, at least exploring the topics covered is better than not - especially the .NET Class Library reference.

So, do you get my point?

J. Dunlap26-Oct-03 9:27

J. Dunlap

26-Oct-03 9:27

Blake Coverett wrote:
crotchety old farts who thinks relying on templates and wizards and such weakens the mind

My take is that you should do it the "hard way" at least a few times so that you know what's going on under the surface, and then save yourself some time by doing it the easy way. Wink | ;)

"Be not overcome with evil, but overcome evil with good." -- Romans 12:21

FLUID UI Toolkit | FloodFill in C# & GDI+

Kevin McFarlane27-Oct-03 5:41

Kevin McFarlane

27-Oct-03 5:41

I agree. Or if you don't try the hard way once, at least try and get some understanding of what the Wizard has done.

Kevin