Listview problems

[Søren Reinke]

Hi everyone.

In a little program i am writing i have a listview, i fill it with data from
an ArrayList which contains a lot of objects. The data for the columns are
differente fields in the objects in the ArrayList.

I have also added column sorting, when a user clicks a column.
All that works fine.

But when a user double clicks a line in the listview (detail mode), an event
is raised, and i get the 'selectedItems' from the listview. From this list i
can find the data in the line that has been clicked.

But my problem is how du i figure out which object from the ArrayList this
line reflects ?

I can have 100% equal objects in the ArrayList.

I could of course add a unique ID for each object, but have not been able to
figure out how to add that to the ListView without showing it to the user.

Can anybody please help me ?

Best regards
Søren Reinke

[Søren Reinke]

I noticed if a add data to a column that does not have a name, it is not
displayed, and then i can use it as an unique ID.

Is that an acceptable way to do it ?

Best regards
Søren Reinke
"Søren Reinke" <so***@reinke.fjernmig.dk> wrote in message
news:d3**********@newsbin.cybercity.dk...

Hi everyone.

In a little program i am writing i have a listview, i fill it with data
from an ArrayList which contains a lot of objects. The data for the
columns are differente fields in the objects in the ArrayList.

I have also added column sorting, when a user clicks a column.
All that works fine.

But when a user double clicks a line in the listview (detail mode), an
event is raised, and i get the 'selectedItems' from the listview. From
this list i can find the data in the line that has been clicked.

But my problem is how du i figure out which object from the ArrayList this
line reflects ?

I can have 100% equal objects in the ArrayList.

I could of course add a unique ID for each object, but have not been able
to figure out how to add that to the ListView without showing it to the
user.

Can anybody please help me ?

Best regards
Søren Reinke

[Alex Passos]

You can use the ListViewItem.Tag property to store information about an
object:

http://msdn.microsoft.com/library/de...sstagtopic.asp
MyObject object = new MyObject("abcde");
ListViewItem item = new ListViewItem();
item.Text = "Some caption";
item.Tag = object;

--------------------------------

MyObject object = null;
ListViewItem item = mylistview.Items[0];
myobject = (MyObject)item.Tag;

Alex

"Søren Reinke" <so***@reinke.fjernmig.dk> wrote in message
news:d3**********@newsbin.cybercity.dk...

Hi everyone.

In a little program i am writing i have a listview, i fill it with data
from an ArrayList which contains a lot of objects. The data for the
columns are differente fields in the objects in the ArrayList.

I have also added column sorting, when a user clicks a column.
All that works fine.

But when a user double clicks a line in the listview (detail mode), an
event is raised, and i get the 'selectedItems' from the listview. From
this list i can find the data in the line that has been clicked.

But my problem is how du i figure out which object from the ArrayList this
line reflects ?

I can have 100% equal objects in the ArrayList.

I could of course add a unique ID for each object, but have not been able
to figure out how to add that to the ListView without showing it to the
user.

Can anybody please help me ?

Best regards
Søren Reinke

[Microsoft]

Hi Reinke,
add a Hidden Column in the listView that will contain the index of the
object, you will assing the index for every row you add so you will be able
to now the possition in the arrayList.
Hope that Helps
"Søren Reinke" <so***@reinke.fjernmig.dk> wrote in message
news:d3**********@newsbin.cybercity.dk...

Hi everyone.

In a little program i am writing i have a listview, i fill it with data
from an ArrayList which contains a lot of objects. The data for the
columns are differente fields in the objects in the ArrayList.

I have also added column sorting, when a user clicks a column.
All that works fine.

But when a user double clicks a line in the listview (detail mode), an
event is raised, and i get the 'selectedItems' from the listview. From
this list i can find the data in the line that has been clicked.

But my problem is how du i figure out which object from the ArrayList this
line reflects ?

I can have 100% equal objects in the ArrayList.

I could of course add a unique ID for each object, but have not been able
to figure out how to add that to the ListView without showing it to the
user.

Can anybody please help me ?

Best regards
Søren Reinke

[Bruce Wood]

Using the ListViewItem.Tag property is the correct way to do it. You
can store either an index value or a reference to the object itself in
the Tag, depending upon what you want to do.

I just wish that ComboBox entries had a Tag property, too. :(

[Søren Reinke]

"Alex Passos" <[e-mail]> wrote in message
news:%2****************@tk2msftngp13.phx.gbl...

You can use the ListViewItem.Tag property to store information about an
object:

http://msdn.microsoft.com/library/de...sstagtopic.asp
MyObject object = new MyObject("abcde");
ListViewItem item = new ListViewItem();
item.Text = "Some caption";
item.Tag = object;

Thanks for all the answers, the .Tag was just what i was looking for.

Best regards
Søren Reinke