C# Discussion Boards - CodeProject

16-Jul-08 3:23

Hi,
My code is looping through records and adding items to a listbox as below:

forloop
{
lstBox1.items.add("item1");
lstBox1.items.add("item2");
}

Question:
How can I change the colour of SOME of the items as they are being added?
Thanks

Luc Pattyn16-Jul-08 3:53

Luc Pattyn

16-Jul-08 3:53

Hi,

there are two basic features you need:
- ListBoxes can contain items of any type, not just strings
- you can paint those items yourself (DrawMode OwnerDrawn, event DrawItem)

So the neat way to do this is define a little class (say MyItem) and let it hold a string and
some style field (maybe a Color). Add instances of that class to the ListBox, make it OwnerDrawn,
and provide a DrawItem handler according to your wishes.

As a shortcut, when I only need two variations (say black and red), I skip the MyItem stuff and
prefix the red items with a special character (say '~'), then in DrawItem check the first char,
and if a '~', choose Color.Red and drop the '~'.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Voting for dummies? No thanks. Dead | X|

arkiboys16-Jul-08 3:58

16-Jul-08 3:58

Hi,
I am not a good c# developer so not sure how to do what you suggested.
Can you make it simpler or guide me through it further please?
Thanks

Luc Pattyn16-Jul-08 4:12

Luc Pattyn

16-Jul-08 4:12

Sorry, no spoon feeding here. I gave you all the required keywords, let Google and MSDN provide you
with the details; and CodeProject holds thousands of interesting articles too.

PS: don't switch Controls, if ListBox is your first choice, stick with it. It is a very good performer.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

Voting for dummies? No thanks. Dead | X|

arkiboys16-Jul-08 4:15

16-Jul-08 4:15

Ok, thanks

Paul Conrad16-Jul-08 9:39

Paul Conrad

16-Jul-08 9:39

Luc Pattyn wrote:
Sorry, no spoon feeding here.

He may not get what he wants (maybe mashed peas, squash, etc) Roll eyes | :rolleyes:

"The clue train passed his station without stopping." - John Simmons / outlaw programmer

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

0x3c016-Jul-08 3:55

0x3c0

16-Jul-08 3:55

For a start, the loop is incorrect. It'd probably be something like this

for(int i = 0; i<3; i++)
{
    lstBox1.Items.Add("item" + i.ToString("N0"));
}

Also, the standard ListBox cannot do that on its own. You could paint it yourself if you have a good grasp of the Graphics object, or you could use the ListView. The loop would change to something like this

for(int i = 0; i<3; i++)
{
    ListViewItem lvi = new ListViewItem("item" + i.ToString("N0"));

    lvi.BackColor = Color.White; //Replace this with the color you want
    ListView1.Items.Add(lvi); //ListView1 is the name of the ListView
}

arkiboys16-Jul-08 4:07

16-Jul-08 4:07

Hi,
I am trying to use a listview to make this easier.
Do you know why I do not get Color in the intellisense please?
Thanks

0x3c016-Jul-08 4:22

0x3c0

16-Jul-08 4:22

Have you added

using System.Drawing;

to the top of the file?

arkiboys16-Jul-08 20:59

16-Jul-08 20:59

All ok now.
Thanks

Treeview Event

Agweet16-Jul-08 3:20

Re: Embeded resources [modified]

16-Jul-08 3:20

Hi all,

Can anyone help...im trying to figure out a way to get the value to text of a node...the problem is that my query returns around 2000 rows...i want to make it that i must click on a node to get its subnodes...how will i go about doing this?

living life on the flip side

Re: Treeview Event

Jimmanuel16-Jul-08 4:45

Jimmanuel

16-Jul-08 4:45

there's a node mouse click event handler that you can use for that. whenever the user clicks a node then you can populate it's child nodes on the fly:

http://msdn.microsoft.com/en-us/library/system.windows.forms.treeview.nodemouseclick.aspx[^]

Embeded resources

hadad16-Jul-08 1:38

hadad

16-Jul-08 1:38

Hello,
I am working in my application with xml files and mdb file,I don't want user view these files I want to put them in the app assembly.
Thanks.

Dad

enginço16-Jul-08 2:14

enginço

16-Jul-08 2:14

yes it works for xml files but I don't know if mdb will work or won't work.
1. add a classLibrary project in your solution,
2. add the xml files into your new classLibrary project.

accessing to xml:
System.Reflection.Assembly xx = System.Reflection.Assembly.Load("yourNewClassLibraryProjectName");
string ress = xx.GetManifestResourceNames();

and you will read with xmlSerializer.

I'm not sure if you can change dinamically that xml files or not... Sniff | :^)

modified on Wednesday, July 16, 2008 8:23 AM

Re: Embeded resources

Thomas Stockwell16-Jul-08 4:40

Thomas Stockwell

16-Jul-08 4:40

The only real purpose of including the mdb file in the assembly is to have an already structured template for database creation/editing. You would not be able to edit the files embedded into the assembly. If you want to 'obscure' what the user can and cannot see with regards to the actual database file, I would suggest that you give it a 'critical application important file' type name. Second I would suggest that you give it an abnormal database extension. Ex. For my RevCorp accounting software I wrote, I labeled the file: AppData.revdb. Their was a copy of the file stored in the assembly. When the file could not be found in the directory where it was run the database was created from the assembly.

Regards,
Thomas Stockwell

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setup that update it self`

ali zaidi16-Jul-08 0:28

ali zaidi

16-Jul-08 0:28

I have created a setup of a win project and i installed the project on client machine.now i update my project and create a new version of setup.
now on client machine it shuld be updated it self

i need your help
thanx

Re: setup that update it self`

Ashfield16-Jul-08 1:16

Ashfield

16-Jul-08 1:16

ali zaidi wrote:
now on client machine it shuld be updated it self

Not unless you have written some code in your app to do it. Google for .net deployment, there are loads of articles showing the problems and pitfalls.

Bob
Ashfield Consultants Ltd

ForEach Loop

Agweet15-Jul-08 22:33

15-Jul-08 22:33

Hi All,

Can anyone tell me wat im doing wrong...im trying to populate a treeview from sql with a foreach loop...my code is like this..

foreach (DataRow dr in dt.Tables)<br />
      {<br />
          <br />
      }<br />

Please tell me wat im doing wrong?

living life on the flip side

J4amieC15-Jul-08 22:37

J4amieC

15-Jul-08 22:37

if dt is a DataSet then dt.Tables is a collection of Tables, not DataRows. If dt is a DataTable (as the name suggests) you want dt.Rows

Agweet15-Jul-08 22:51

15-Jul-08 22:51

thanks alot...works like a bomb...thanks to all Laugh | :laugh:

living life on the flip side

Agweet16-Jul-08 0:15

16-Jul-08 0:15

ok thanks for your help but now i have another question...im trying to add subchild nodes to childnodes... my code

ListItem lstItem = new ListItem();
foreach (DataRow row in dt.Rows)
{
    TheNode13.Text = "";
    lstItem.Value = row["ID"].ToString();
    lstItem.Text = row["Name"].ToString();
    TheNode13.Text = lstItem.Text;
    TheNode13.Value = lstItem.Value;
    TheNode12.Nodes.Add(TheNode13);
}

everytime i add them then it overwrites the subchildnode and add the same node twice...wat am i doing wrong?

living life on the flip side

PIEBALDconsult17-Jul-08 17:34

PIEBALDconsult

17-Jul-08 17:34

You need to instantiate a new TreeNode each time.