C# Discussion Boards - CodeProject

Dave Kreskowiak11-Feb-05 4:06

11-Feb-05 4:06

Your point being....? I take it your coming from a Java background?

Because octal literals are deprecated? And, I don't remember seeing any documentation that C# ever supported them.

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

Re: Octal numbers in C#

S. Senthil Kumar11-Feb-05 7:12

S. Senthil Kumar

11-Feb-05 7:12

My point being that C# being a language from C/C++/Java background, with the same syntax for representing hex numbers, should have had support for octal numbers. At least, the compiler should have given me a warning when I prefixed a 0..

Octal literals are available in C and C++, not just Java.

Octal literals deprecated? Why would they do that? I must admit I've never read the standard completely, but then, I didn't need to read the standard to know to prefix 0x for hex numbers either..

Regards
Senthil

Re: Octal numbers in C#

Dave Kreskowiak11-Feb-05 9:09

Dave Kreskowiak

11-Feb-05 9:09

Since C# does recognize Octal literals, prefixing a 0 just makes it a decimal number. The compiler won't generate a warning based on some other languages syntax rules.

Why? Because it's not used often enough to justify the expense of adding support for it? I don't know - ask Microsoft. They've removed Octal literals from their own JScript.NET too...

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

Scroll To Caret For exterior TextBox Scrolling

SubterII10-Feb-05 13:35

SubterII

10-Feb-05 13:35

I want to scroll a text box using a label, don't ask why I just need to :P... How can I scroll the caret through the textbox so that I can use ScrollToCaret() ?

If this is impossible, is there a way to edit the scroll bar colors just for this program??

Thanks,
Sub

Re: Scroll To Caret For exterior TextBox Scrolling

Dave Kreskowiak11-Feb-05 3:59

Dave Kreskowiak

11-Feb-05 3:59

Use the TextBox SelectionStart property to put the caret at end the end of the text. You can then use ScrollToCaret() to make sure it's visible in the TextBox. There is a drawback to using ScrollToCaret though. The TextBox must have the focus in order for it to work.

TextBox1.SelectionStart = TextBox1.TextLength;
TextBox1.Focus();
TextBox1.ScrollToCaret();

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

Playing wav sounds in a .NET Web App

Anonymous10-Feb-05 13:29

Anonymous

10-Feb-05 13:29

Does anyone know how i would i play wav sounds in my web forms?. I'd like to play the sound when the form loads and keep playing until i have moved to another form.

Thanks in advance,

Alexander

Re: Playing wav sounds in a .NET Web App

Christian Graus10-Feb-05 14:22

Christian Graus

10-Feb-05 14:22

DirectShow/WindowsMediaPlayer, or there's a playsound API, I think, you can interop it.

Christian

I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer

Re: Playing wav sounds in a .NET Web App

Dave Kreskowiak11-Feb-05 3:54

Dave Kreskowiak

11-Feb-05 3:54

Christian Graus wrote:
or there's a playsound API, I think, you can interop it.

In a WEB form? I don't think so. Big Grin | :-D

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

Re: Playing wav sounds in a .NET Web App

Christian Graus13-Feb-05 19:28

Christian Graus

13-Feb-05 19:28

Oops - missed that bit...

Christian

I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer

Re: Playing wav sounds in a .NET Web App

Dave Kreskowiak11-Feb-05 3:53

Dave Kreskowiak

11-Feb-05 3:53

You'll have to use HTML methods to do this. ASP.NET is a server-side technology that only generates HTML. It can't play a sound client-side using any method.

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

Building a treeview from an object graph (reflection)

Rein Petersen10-Feb-05 11:19

Rein Petersen

10-Feb-05 11:19

Hi all,

I'm toying with reflection to try and build a recursive function that generates treenodes of a treeview that represent any given object's graph (of child objects):

public TreeNode BuildNode(ref object o)
{
TreeNode tn;
treenode.Tag = o;
treenode.Text = typeof(o).Name;

if (typeof(o).GetInterface("System.IEnumerable",true))
foreach (object c in o)
tn.Nodes.Add(BuildNode(ref c));
else
foreach(MemberInfo m in typeof(o).GetProperties(BindingFlags.Public))
tn.Add(BuildNode(ref m.???); // << Trouble here ...
// I really just want access
// to the property from the
// MemberInfo object...
return tn;
}

As you can see, it almost works except I have no way of accessing an [un?]boxed object's property. I know from reflecting the object's type that it has the property, but have no way of accessing the property (in a generic manner) without hardcoding my object types into a bunch of overloads of 'BuildNode', or having some way-huge switch.

Looking for advice, pointers to documents, creative ideas, etc. that might get me closer to a solution.

Thanks for all your help,

Rein

File Compression

Shady Aly10-Feb-05 10:58

Shady Aly

10-Feb-05 10:58

Hello all,
is there C# code that zip and unzip file
thank you

Re: File Compression

therealmccoy10-Feb-05 11:19

therealmccoy

10-Feb-05 11:19

I'm not much of a programmer, but a quick search on the web...

http://www.icsharpcode.net/OpenSource/SharpZipLib/[^]

www.lovethosetrains.com

Re: File Compression

mikker_12310-Feb-05 15:43

mikker_123

10-Feb-05 15:43

Maybe u are hell of a searcher then ^_^

static constructors

Yaakov Davis10-Feb-05 8:57

Yaakov Davis

10-Feb-05 8:57

Hi everybody.

There Is a way to change the initialization sequence in static constructors?

I have the following code:

<br />
class MyClass<br />
{<br />
   static int a;<br />
   static bool b = true;<br />
<br />
   static MyClass()<br />
   {<br />
      a = 10;<br />
   }<br />
}<br />
<br />

The compiler generates the following:

<br />
class MyClass<br />
{<br />
   static int a;<br />
   static bool b;<br />
<br />
   static MyClass()<br />
   {<br />
      b = true;<br />
      a = 10;<br />
   }<br />
}<br />

I want that member a will be initialized before b does, but I must do it on runtime.
In other words, there is some parameter that tells the compiler to place the inline initializations in the end of the static constructor?

Thanks a lot,
Yaakov

Re: static constructors

Dave Kreskowiak10-Feb-05 9:07

Dave Kreskowiak

10-Feb-05 9:07

No, there isn't. It looks like your going to have to design your code around this little problem and initialize the new instance of the class yourself instead of relying on the compiler to do it for you.

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

Re: static constructors

Yaakov Davis10-Feb-05 10:09

Yaakov Davis

10-Feb-05 10:09

Thanks.

I have added a suggestion in the Feedback Center.

Yaakov

Re: static constructors

S. Senthil Kumar10-Feb-05 9:59

S. Senthil Kumar

10-Feb-05 9:59

Simply set the value of b in the static constructor, after setting a.

Split app.msi into multiple msi and install-on-demand

Ruchi Gupta10-Feb-05 8:51

Ruchi Gupta

10-Feb-05 8:51

I have a C# windows application, for which I am building setup project. Since the project generates crystal reports (Designed using Version 10) I need to include merger module - CrystalReports10_NET_EmbeddedReporting.msm. I install the application on client machine and everything works fine.

BUT since this Merger mudule is so huge that in increases the app.msi file size (some where newar 50 MB). I was wondering if there is a way to split the app.msi and add a launch condition that checks the GAC if required crystal DLL are there. If not it should install the other msi that writes dll's onto GAC

Any direct or round about way to accomplish above. Basically the problem is setup is placed at a network location and due to huge size of msi it takes annoying amount of time to load installer and then to do the installation steps.

Thanks in advance
Ruchi

detecting IE close event

Adnan Siddiqi10-Feb-05 8:50

Adnan Siddiqi

10-Feb-05 8:50

first of all thanks to Heath Stewart for his previosu responses to solve my problems,i am again with new issue=)

is there anyway to detect that IE is being closed or in short CloseEvent for IE?
i found ClosingWindow event but MSDN says it works only if window.close() is called from Jscript.

any help in this regard?

thanks

-adnan

ListView BeforeSelect

stoked10-Feb-05 8:36

stoked

10-Feb-05 8:36

Can anyone enlighten me on how to add a BeforeSelect event to a ListView control? The TreeList control has one, but ListView does not. I have a data-bound version of a ListView control and need to evaluate whether a new list item can get focus based on validation of the current item.

I have a workaround via the SelectedIndexChanged event, but I don't like it since the last selected item retains the selection (dotted) box outline even if I force going back to the old index position.

Thanks.

unique identifier on a thread

sameerhanda10-Feb-05 8:30

sameerhanda

10-Feb-05 8:30

Ok this just may be very trivial. I am trying to get a unique identifier on a thread. Is this any way to get a system generated unique thread identifier or any such value which can be used in the indexer to keep track of the run.

Re: unique identifier on a thread

C# Genius10-Feb-05 8:44

C# Genius

10-Feb-05 8:44

Thread class does not have an intrinsic ID property of any sort. You can however creat a public property and populate it with unique data yourself.

Re: unique identifier on a thread

Dave Kreskowiak10-Feb-05 9:02

Dave Kreskowiak

10-Feb-05 9:02

The Thread class has a Name property you can use to name your threads with any name that you want to generate. It's entirely up to you what you call it.

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

Re: unique identifier on a thread

Stefan Troschuetz11-Feb-05 0:18

Stefan Troschuetz

11-Feb-05 0:18

I've sometimes misused the inherited GetHashCode method to determine whether methods are called by the same thread or different ones.
It's ok for such simple purposes, but if you need reliable results it's probably not suitable, cause MSDN states that the "default implementation of GetHashCode does not guarantee uniqueness or consistency".

www.troschuetz.de

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