C# Discussion Boards - CodeProject

Ahmed Galal13-Dec-03 1:26

13-Dec-03 1:26

why im always getting a format exception when am tryin to convert a string to int using Convert.ToInt32() ??
however, the string only contains "5" .

thanx

Re: Converting to Integer

Heath Stewart13-Dec-03 6:33

Heath Stewart

13-Dec-03 6:33

It should work (and does work in all other cases), so it begs the question: are you sure the string only contains "5" (by debugging your code and checking the string going into Convert.ToInt32), or do you only think it does? Remember that strings are immutable, so that if you originally had a string like "asdf5" and called someString.Remove(0, 4), it doesn't modify the original string but returns a new one instead (which you could assign to the same variable if you wanted).

-----BEGIN GEEK CODE BLOCK-----
Version: 3.21
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-----

Re: Converting to Integer

Ahmed Galal13-Dec-03 9:03

Ahmed Galal

13-Dec-03 9:03

heres my code.

<br />
nLevels = Convert.ToInt32(Levels.ToString(),16);<br />

where Levels is a textbox and contains a number !

is there any errors ?

thanx for reply

Re: Converting to Integer

Colin Angus Mackay13-Dec-03 9:33

Colin Angus Mackay

13-Dec-03 9:33

Try
nLevels = Convert.ToInt32(Levels.Text, 10);

I've never tried a TextBox.ToString() but I suspect it won't give you what you want. Also the 16 you've got in your line of code tells it to expect a Hexadecimal value rather than a decimal value. Are you sure that is what you wanted also?

--Colin Mackay--

"In the confrontation between the stream and the rock, the stream always wins - not through strength but perseverance." (H. Jackson Brown)

Enumerators in .NET: See how to customise foreach loops with C#

Re: Converting to Integer

Heath Stewart13-Dec-03 16:19

Heath Stewart

13-Dec-03 16:19

Right, he definitely wants 10 for the radix. Also, System.Windows.Forms.TextBox.ToString always returns the Type, "System.Windows.Forms.TextBox", as do most classes (well, their own Type, which is inherited functionality from Object.ToString).

Re: Converting to Integer

leppie13-Dec-03 8:51

leppie

13-Dec-03 8:51

ALso try explicitly defining the number base.

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Re: Converting to Integer

Meysam Mahfouzi13-Dec-03 16:48

Meysam Mahfouzi

13-Dec-03 16:48

int x = int.Parse(str);

Don't forget, that's

Persian Gulf

not Arabian gulf!

OLE

Abdulghani Sabbagh12-Dec-03 23:58

Abdulghani Sabbagh

12-Dec-03 23:58

Is .net supported with OLE?
If it is have you sample of it

Abdul

Re: OLE

Heath Stewart13-Dec-03 6:29

Heath Stewart

13-Dec-03 6:29

Abdulghani Sabbagh wrote:
Is .net supported with OLE?

This makes absolutely no sense. .NET supports COM (what OLE evolved into) and COM supports .NET through RCW's and CCW's, respectively. There is lots of information about COM Interop in the .NET SDK Framework that you should read because it's not a quick topic to answer - especially in the forums.

You can also read more about it from Nick Parker's article, Creating a CCW for COM enabled non .NET applications[^]. For more advanced articles, see mine, Embedding .NET Controls in Java[^], which deals with some of the late- and early-bound issues of CCWs.

Open document managment API

Abdulghani Sabbagh12-Dec-03 23:56

Abdulghani Sabbagh

12-Dec-03 23:56

Hi all
I want to use the Open document managment API but I can't find any infomation about it.
Can any body help?

Abdul

Re: Open document managment API

Heath Stewart13-Dec-03 6:37

Heath Stewart

13-Dec-03 6:37

Amazing! I simply typed "open document management" into google[^] (with quotes) and found many links! Roll eyes | :rolleyes:

Custom draw Treeview Control

MrJJKoolJ12-Dec-03 16:02

MrJJKoolJ

12-Dec-03 16:02

Hi All,

How do I create a custom paint treeview control or an owner drawn treeview control ?

Any tutorials on this anywhere? not in Asp.net please.

Thanks,
JJ

Re: Custom draw Treeview Control

eggie512-Dec-03 18:17

eggie5

12-Dec-03 18:17

usually trying a google search FIRST... helps alot.

/\ |_ E X E GG

Re: Custom draw Treeview Control

Alex Korchemniy13-Dec-03 13:49

Alex Korchemniy

13-Dec-03 13:49

LOL. You are so right. There are so many people that don't even bother to spend a minute looking for anything.

I think there needs to be a message added to this board advising people to search the message board before posting and trying msdn or google.

Re: Custom draw Treeview Control

eggie513-Dec-03 14:52

eggie5

13-Dec-03 14:52

word.

/\ |_ E X E GG

C# control hosed in ActiveX: no tabbing

thedex12-Dec-03 11:31

thedex

12-Dec-03 11:31

Hi,
I hosted a C# control in an ActiveX control, but now the tabbing between the controls doesn't work anymore.
Any ideas?

Thanks

Re: C# control hosed in ActiveX: no tabbing

Heath Stewart12-Dec-03 12:01

Heath Stewart

12-Dec-03 12:01

This might actually be better to ask in the COM forum, but basically your C# control (via a CCW) must be UIActive - if memory serves me correctly - to receive the focus. This is specific to the container (which would be a native COM container), not the control itself.

ListView BeginUpdate not working

Darryl Borden12-Dec-03 11:28

Darryl Borden

12-Dec-03 11:28

I have run into a problem when updating a ListView object with hundreds or thousands of records at a time.

I do a listView1.BeginUpdate before I start and an EndUpdate when I am done, but even though the contents of the listview are not updating, it still takes an inordinate amount of time to update the object (15 seconds for 2000 items).

If the listview is not visible (i.e. the tab the object is on in a tab control is not the selected tab), then it updates in a 10th of the time.

I know there is a LockWindowUpdate available as an API call but either I am calling it wrong or it has no effect on the listview object.

Can anyone out there help me out?

Darryl Borden
Principal IT Analyst
darryl.borden@elpaso.com

Re: ListView BeginUpdate not working

Heath Stewart12-Dec-03 11:40

Heath Stewart

12-Dec-03 11:40

This is happening because, while the control is not visible, the Windows handle is not created. When the Windows handle is not created, no sorting (and a few other things) is done. If the control is visible - even if it isn't currently painting items - it sorts with each addition to the Items collection!

Even using the LockWindowsUpdate API won't do anything to resolve this issue. The BeginUpdate and EndUpdate methods essentially do the same thing. They disable and enable drawing (respectively) by using the WM_SETREDRAW message. While it isn't documented, LockWindowsUpdate probably does this very same thing.

So, you'll either have to bite the bullet and accept the lag, or hide your control and reshow it when you're finished, but that might be annoying to the user. If nothing else, show a progress bar (so add the items in a separate thread, but be sure to use InvokeRequired and Invoke to actually add the items!) while you're adding items to the user knows that something's happening and that they should way. You should also use a try-finally block to show the wait cursor (Cursor.Current = Cursors.WaitCursor) and, in the finally block, set it back to the default (Cursor.Current = Cursors.Default).

Outloog slidemenu control in C#

naxos12-Dec-03 10:36

naxos

12-Dec-03 10:36

Hey

I'm looking for at control like the slidemenu in MS Outlook. Is it an existing component ready for use or where do i find information?

Best regards

Rasmus

Re: Outloog slidemenu control in C#

Heath Stewart12-Dec-03 11:31

Heath Stewart

12-Dec-03 11:31

Search[^] this site or try google. Being such a popular control, you'll definitely find lots of commercial libraries and probably quite a bit of sample code.

Re: Outloog slidemenu control in C#

Luis Alonso Ramos13-Dec-03 21:53

Luis Alonso Ramos

13-Dec-03 21:53

There are examples here in CodeProjet:

http://www.codeproject.com/cs/miscctrl/csoutlookbar.asp[^]

There is also a great example (I've used it myself) in the UtilityLibrary written by Carlos H. Perez (which I can no longer find in CodeProject.)

-- LuisR

──────────────
  Luis Alonso Ramos
  Chihuahua, Mexico
  www.luisalonsoramos.com

"San Franciso - where men are men - er - women are men - ugh - men are women, and well, the sheep are confused." -- John Simmons, Jun. 25, 2003

Problem with ListBox heights

blakeb_112-Dec-03 6:35

blakeb_1

12-Dec-03 6:35

Why will listboxes not change their height correctly? They only resize vertically in certain increments, based on the font size. Is there any way to change this so that you can set the listbox to whatever height you want, and it will actually stay at that exact height?

Thanks,

Blake

Re: Problem with ListBox heights

leppie12-Dec-03 6:39

leppie

12-Dec-03 6:39

You wanna set the IntegralHeight property to false;

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Seen on my Campus BBS: Linux is free...coz no-one wants to pay for it.

ComboBox

Gary Kirkham12-Dec-03 5:32

Gary Kirkham

12-Dec-03 5:32

Does anyone know how to write directly to the textbox in the ComboBox. I want to bypass the .Text property.

Gary Kirkham

A working Program is one that has only unobserved bugs

I thought I wanted a career, turns out I just wanted paychecks

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