C# Discussion Boards - CodeProject

Re: ++x + x and x + ++x

Laxman Auti21-Mar-07 3:32

Laxman Auti

21-Mar-07 3:32

Varibrus wrote:
Why z is 4, but z1 is 3?

+ is the arithmatic operator which works left to right

When int z = ++x + x; expression executes it increments the value of x and put it into stack(generally all the operations are done with the help of stack Smile | :)

). so stack will be 2 + value of x(i.e. 2) so result is 4.

When int z = x + ++x; expression executes stack will be 1 + incremented value of x(i.e. 2) so result is 3.

Knock out 't' from can't,
You can if you think you can
Cool | :cool:

Main form with always-on-top flag + dialog

Dominik Reichl21-Mar-07 2:36

Dominik Reichl

21-Mar-07 2:36

Hello!

I got a main form, which can set to be always-on-top (this is achieved using the TopMost property of the main form).

The problem now is that when opening a modal dialog box, the dialog appears behind the main window.

The brute-force solution would be to disable the always-on-top mode while displaying the dialog. A better solution would be to tell the dialog somehow that its parent is the main form and therefore to appear in front of it. I tried setting the Owner, Parent and ParentForm properties of the dialog, but nothing worked (Owner: doesn't do anything, Parent: not allowed for top-level controls, ParentForm: read-only property).

Any solution? How can the dialog displayed in front of the main window?

Thanks and best regards
Dominik

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Re: Main form with always-on-top flag + dialog

Stefan Troschuetz21-Mar-07 2:45

Stefan Troschuetz

21-Mar-07 2:45

Did you try also enabling the TopMost property of the dialog.

"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning." - Rick Cook

www.troschuetz.de

Re: Main form with always-on-top flag + dialog

Dominik Reichl21-Mar-07 4:13

Dominik Reichl

21-Mar-07 4:13

No, didn't try that Blush | :O

Works great, thank you!

Too many passwords to remember? Try KeePass Password Safe!

Re: Main form with always-on-top flag + dialog

Stefan Troschuetz21-Mar-07 4:31

Stefan Troschuetz

21-Mar-07 4:31

Glad to hear my guess was right Smile | :)

Progressive Disclosure Control in windows form using c#

Kumar Subramanian21-Mar-07 2:03

Kumar Subramanian

21-Mar-07 2:03

Hi !

I would like to implement the Progressive Disclosure Controls in windows forms using c# . The Progressive Disclosure Control is the same when you use the add/remove programs from control panel the particular row gets expand when its clicked .
Can anyone give a ref. or sample code for this kind of implementation.

Thankyou

/S.Kumar

Re: Progressive Disclosure Control in windows form using c#

joon _vh.21-Mar-07 5:11

joon _vh.

21-Mar-07 5:11

I was watching to see if anyone would reply. So I'll make an attempt. I've done some reading on this, and it's a bit confusing. Progressive Disclosure is a UI pattern, and on MSDN[^] they talk about Prog. Disc. Controls like they're just arrows.

Start with the MSDN article, if you haven't already. Other than that, I myself am interested in whether there really are standard/custom controls like f.e. the one used in Add/Remove programs.

Visual Studio can't evaluate this, can you?

public object moo<br />
        {<br />
__get { return moo; }<br />
__set { moo = value; }<br />
}

Constructor is instance method?

Russell Jones21-Mar-07 2:00

Russell Jones

21-Mar-07 2:00

ConstructorInfo ctor = LocatedType.GetConstructor(BindingFlags.NonPublic|BindingFlags.Instance, System.Type.DefaultBinder, new Type[] { }, new ParameterModifier[] { });

I've just been creating some code to let me unit test private methods on classes. I created the code and then thought that maybe i might want to test a private constructor in the future so i started playing with the get constructor method.

The thing that surprised me was that i need to use BindingFlags.Instance rather than BindingFlags.Static to get the constructor. Does this strike anyone else as strange?

Russell

Re: Constructor is instance method?

Pete O'Hanlon21-Mar-07 3:09

Pete O'Hanlon

21-Mar-07 3:09

No. When you think about it, the constructor is not a static method.

Deja View - the feeling that you've seen this post before.

Re: Constructor is instance method?

Russell Jones21-Mar-07 3:19

Russell Jones

21-Mar-07 3:19

You're right. There after all specific static constructors. It just seemed that calling a ctor an instance method was going to start a chicken / egg problem.

Russ

Re: Constructor is instance method?

Pete O'Hanlon21-Mar-07 3:31

Pete O'Hanlon

21-Mar-07 3:31

Russell Jones wrote:
It just seemed that calling a ctor an instance method was going to start a chicken / egg problem

I can answer that one as well. The egg came first. If you follow evolutionary theory here, then the egg must have come first because the chicken was the result of genetic adaptation/mutation, but the egg was there before. Big Grin | :-D

Deja View - the feeling that you've seen this post before.

Re: Constructor is instance method?

Russell Jones21-Mar-07 3:45

Russell Jones

21-Mar-07 3:45

That's always been my argument.

This site has now been blacklisted in 5 states of the USA.

Russell

Re: Constructor is instance method?

Pete O'Hanlon21-Mar-07 3:49

Pete O'Hanlon

21-Mar-07 3:49

Ah - those creationists and their zany sense of humour.

Deja View - the feeling that you've seen this post before.

events and remoting

D2raghu21-Mar-07 1:46

D2raghu

21-Mar-07 1:46

i have just started working on .net remoting . well, an event is raised on some method call in the remote object. But while i assign a handler to the remote object's event property a SecurityException is raised stating :
"Type System.DelegateSerializationHolder and the types derived from it (such as System.DelegateSerializationHolder) are not permitted to be deserialized at this security level."

Re: events and remoting

KaineDunno21-Mar-07 2:10

KaineDunno

21-Mar-07 2:10

Hi,

Just happened to see that same error yesterday...

check out this link http://www.codeproject.com/useritems/RemotingEvent.asp

Section solution 2.

When you implement a wrapper class which can be accessed from both client and server side you app should work

Greetings

Kaine

Re: events and remoting

m@u21-Mar-07 2:34

m@u

21-Mar-07 2:34

Hi.

This is because of the remoting security. Normally types that are in GAC-registered assemblies are allowed to be serialized and deserialized, unless they're derived from:
- System.Runtime.Remoting.ObjRef
- System.DelegateSerializationHolder
- System.Runtime.Remoting.IEnvoyInfo
- System.Runtime.Remoting.Lifetime.ISponsor

you have to set the typefilterlevel to "Full" in your channel-configuration.

for more information take a look at this: http://msdn2.microsoft.com/en-us/library/5dxse167(vs.80).aspx[^]

greets

m@u

XML element, node .. whaa!!

Michael Hendrickx21-Mar-07 1:33

Michael Hendrickx

21-Mar-07 1:33

Dear all,

Probably is the answer pretty obvious, but I have been struggling with this for the past 2 days already, and it's making me frustrated.

I got following XML file

<br />
<?xml version="1.0" encoding="ISO-8859-1"?><br />
<things><br />
  <people><br />
    <person id="1"><br />
       <name>Bob</name><br />
       <age>25</age><br />
       <projects><br />
         <project x="123" y="123">ABC</project>  <br />
         <project x="53" y="149">DEF</project>       <br />
         <project x="13" y="111">FOO</project><br />
         <project x="463" y="435">BAR</project><br />
       </projects><br />
    </person><br />
    <person id="2"><br />
       <name>Steve</name><br />
       <age>100</age><br />
    </person><br />
    <person id="3"><br />
       <name>Maria</name><br />
       <age>23</age><br />
       <projects><br />
         <project x="1" y="1">HOT</project>  <br />
       </projects><br />
    </person><br />
  </people><br />
  <file><br />
    <name>filename.ext</name><br />
  </file><br />
</things><br />

How can I add in C# a new person, and acess the "people" node.. I even cut away so much code, that I ended up with following, just to print out what's in there, and it even fails:

<br />
doc = new XmlDocument();<br />
doc.Load(this.filename);<br />
XmlElement rootPeople = doc.GetElementById("people");<br />
XmlNodeList node = rootPeople.GetElementsByTagName("person");<br />
for (int i = 0; i < node.Count; i++)<br />
{<br />
    Console.WriteLine(node[i].InnerXml);<br />
}<br />

I have been messing with Xmlnodelists, xmlelements, xmlwhatevers, but even after reading the first 2 pages of google results, it still doesn't seem to work..

Can somebody point me in the good direction?

Thanks,
mike

www.code.ae

Re: XML element, node .. whaa!!

Stefan Troschuetz21-Mar-07 1:51

Stefan Troschuetz

21-Mar-07 1:51

First of all, I suggest using the SelectNodes and SelectSingleNode methods instead of GetElementsByTagName since both use XPath expressions and therefore allow specifying/restricting the selection in more detail. You can for example select the (first) people node by writing

XmlNode peopleNode = doc.SelectSingleNode("//things/people");

To create a new person or more general new nodes in a XML document take a look at this Create New Nodes in the DOM[^].

Re: XML element, node .. whaa!!

Michael Hendrickx21-Mar-07 2:19

Michael Hendrickx

21-Mar-07 2:19

Thank you Stefan, works like a charm!!

Seems that, after reading your signature.. the universe is building improved versions of me Smile | :)

Thanks again.

www.code.ae

C# and C++

Russell^'21-Mar-07 1:00

Russell^'

21-Mar-07 1:00

I have a problem like Yanshof.
I have a class writed in C++ (I don't want to translate it), it is used to store and processing te data...but the interface of the program must be writed in C# (or VB).
It is possible to do this in a simply way (using Visual Studio 2003 .NET?) ?
How to create this solution that contains this classes in different lenguages.
Y/N ?
If yes, does anyone can show me the way, I need only a simple example (the classic "hello word" in mixed lenguage is enough)

Thanks a lot

Cheers,
Russell

Re: C# and C++

Andrei Ungureanu21-Mar-07 3:39

Andrei Ungureanu

21-Mar-07 3:39

A very simple way is to set some of your procedures written in C++ as exports. And using DllImport attribute in C# you can use those exports

Do your best to be the best

Re: C# and C++

Russell^'21-Mar-07 3:53

Russell^'

21-Mar-07 3:53

First, thanks you for your reply. Big Grin | :-D

Yes, of course, using dll I can export the 'procedures',.... but this is not exactly what I need: I need to use an entire class, his member functions and (expecially) his member variables.
I am hoping that it is possible to create a unique Visual Studio solution composed by 2 sub-solution, one (written in C++) that contains the document and the other (written in C# or VB NET) to visualize this document.
But, unfortunatly, I'm going to think that it is not possible, nobody is confirming this 'dream' to any of my posts.

Let me know

Cheers,
Russell

Re: Form closing

szukuro21-Mar-07 0:46

szukuro

21-Mar-07 0:46

Use the Form.Closing event for this where you can set the CancelEventArgs to decide if the form will actually close. However I don't think that works if you end the process via task manager.

Re: Form closing

joon _vh.21-Mar-07 0:51

joon _vh.

21-Mar-07 0:51

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
    e.Cancel = true;
}

When you close it with taskmanager from the Applications menu, this event is also fired, but not when you close the underlying process via the Processes panel.

Visual Studio can't evaluate this, can you?

public object moo<br />
        {<br />
__get { return moo; }<br />
__set { moo = value; }<br />
}

Re: Form closing

Muammar©

21-Mar-07 1:18

Thanks joo_{n_} Rose | [Rose]

Smile: A curve that can set a lot of things straight!
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