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3 Items, 1 Pages 1 |< << Go >> >|

	KrisV
	Asp.Net User

Custom List Control

7/22/2005 4:00:11 AM

0/0

Hi all,

here's a little thing that I'd really like to work out ... I'm tryiong to create a custom listcontrol (ListBox) that has an extra value field
after much research I found out that ListItem is sealed so I wrote my own imp which works perfectly after this I created a custom collection for the "DoubleListItem" obj

now the bit thats not falling into place I need to work out how to use my collection for the custom control instead of base.Items (yep trying to use listbox to save time)
and it does work as it is .. but the control as two collections the derived one from ListBox (base.Items / MyControl.Items) and mine (SmartControls.DoubleItems / MyControl.DoubleItems)

can I get rid of it somehow... or should I just ignore it?

DoubleItems does use IStateManager to keep track of its own Viewstate ...

any one that has any ideas or comments or the idea please feel free to comment.

P.S unless im missing something I dont need it and guessing it'd be awful confusing to a third party using the control

Thanks in Adv,

Kris V

-=Will this Ever Changing World Ever be Different?=-

	billrob458
	Asp.Net User

Re: Custom List Control

7/22/2005 2:51:55 PM

0/0

When I have needed an extra "value" for a ListItem, I have just used the AttributeCollection of the ListItem.

ListBox listBox;

foreach( DataRow row in dataTable.Rows )
{
   ListItem item = new ListItem();
   item.Value = row["Value"].ToString();
   item.Text = row["Text"].ToString();
   item.Attribute["Value2"] = row["Value2"].ToString();
   listBox.Items.Add( item );
}

Then for retrieval of the value:

ListItem item = listBox.SelectedItem;
string text = item.Text;
string value = item.Value;
string value2 = item.Attributes["Value2"];

Now the only thing to watch for is the attribute values are not serialized to viewstate automatically. I would recommend, rather than your custom ListItem, that you derive from your list control (ListBox or DropDownList), and override the SaveViewState and LoadViewState methods to save the attribute values and reload them. You can easily comment these methods out to explain why and what they are doing for future support.

If you need help with overriding the ViewState management let me know, but that is the direction I would take.

bill

	KrisV
	Asp.Net User

Re: Custom List Control

8/1/2005 6:04:00 AM

0/0

Hi Bill,

Sorry its taken me ahwile to answer again and thanks for your help .... however the reason behind the custom list control is so that two seperate items are actually displayed in the listbox i.e 10 Pears $100 where each element is a seperate value I suppose this could just be emluated i.e the text field is string+tab+string+tab+string and the store the values as attribs interesting idea however if anyone could solve this one it'd be great another problem is formatting inside the list control for some reason even if I have a Custom Formatter i.e {0,-62} it never works (it does in the raw html (i.e whitespace) but doesn't show in the listbox ?

thanks in Advance

Kris V

-=Will this Ever Changing World Ever be Different?=-

3 Items, 1 Pages 1 |< << Go >> >|

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