populate the listbox with items in array

Question

2.50/5 (2 votes)

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Hi Everyone,
I am developing windows mobile 7 application using c# in silverlight.
I need to take all the items I have in a array and input them into an listbox using c#

I am developing application that fetch the string from web service an stored in array named as mygroup(specified in the code).I need to display it in listbox.

here is my code:

for(int i = 0; i < userDetails.GroupDetails.Count; i++)
            {
               mygroup[i]= userDetails.GroupDetails[i];
              // this.listBox1.ItemsSource = mygroup[i].GroupName;
         // MessageBox.Show(Convert.ToString(mygroup[i].GroupName));

            }

Please Help me.

Thanks in Advance.

Posted 17-May-11 3:12am

Saranya Natesan

Updated 17-May-11 3:14am

Ramalinga Koushik

v2

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Mark Salsbery · Answer 1 · 2011-05-17T06:03:00

Solution 2

From the looks of your commented code, you don't have an understanding of how Silverlight itemscontrols are used.

You may want to work on learning Silverlight programming first...

Silverlight[^]

Posted 17-May-11 6:03am

Mark Salsbery

Abhishek Sur · Answer 2 · 2011-05-17T11:48:00

Solution 3

Use

<ListBox ItemsSource="{Binding}" x:Name="listBox1" ></ListBox>

in your XAML and in your code, put

this.listBox1.DataContext = collection;

Note : Collection could be better suited if you use an ObservableCollection so that if you add up an element later on the same collection, it will update your UI automatically.

Thats all.

Posted 17-May-11 11:48am

Abhishek Sur

Updated 17-May-11 20:56pm

v2

Comments

Mark Salsbery 17-May-11 19:54pm

Question...How does setting the DataContext to a single item in the array populate the ListBox?

Abhishek Sur 18-May-11 2:55am

Oops. You found my bug. I thought myGroup does not hold a single value. Of course you need to pass an Enumerable, may be better to use ObservableCollection to the DataContext to make it work.

Mark Salsbery 18-May-11 2:57am

:) Arrays are IEnumerable too, but yes I agree there's better collection types to use.

Abhishek Sur 18-May-11 3:07am

Yes, Actually Binding in XAML gives you a better chance to handle your data. If you are using MVVM patter, you can always store your Collection object and update the UI whenever required. Arrays are good, but they dont follow the rules with Binding, say it need to invoke INotifyCollectionChanged otherwise it needs to bind the whole Listbox again (means creating the Visual again altogether) Rather if you use a Collection which has INotifyCollectionChanged implemented, the control is capable of updating itself in part.

Yes arrays will work but only when the data is somewhat static for the current run.

Mark Salsbery 18-May-11 3:40am

I assume that reply was meant for me but I'm glad you posted it to the OP...(s)he needs to learn that stuff!

Abhishek Sur 18-May-11 15:10pm

Woot

Saranya Natesan · Answer 3 · 2011-05-17T18:29:00

Solution 4

thanks all for your replies.

"this.listBox1.DataContext = mygroup[i]"

it works ,but am getting only single value(last value of the loop) in my list box.it's not populating all the content from my data source "mygroup[i]".

Posted 17-May-11 18:29pm

Saranya Natesan

Comments

Mark Salsbery 18-May-11 1:50am

Why is this posted as a solution?

You only get a single value because that's exactly what you set the DataContext as. I have no idea why multiple posted solutions said to do that.

There's no reason this shouldn't work unless there's something you're not showing...

for(int i = 0; i < userDetails.GroupDetails.Count; i++)
{
mygroup[i]= userDetails.GroupDetails[i];
}
this.listBox1.ItemsSource = mygroup;
// or this (if XAML is <ListBox Name="listBox1" ItemsSource="{Binding}" >)
//this.listBox1.DataContext = mygroup;

This works (XAML looks like this: <ListBox Name="listBox1" />):

string[] mygroup = new string[10];
for(int i = 0; i < 10; i++)
{
mygroup[i]= i.ToString();
}
this.listBox1.ItemsSource = mygroup;

Saranya Natesan · Answer 4 · 2011-05-17T18:47:00

Solution 5

thanks all for your replies.

"this.listBox1.DataContext = mygroup[i]"

it works ,but am getting only single value(last value of the loop) in my list box.it's not populating all the content from my data source "mygroup[i]".
help me out this

Posted 17-May-11 18:47pm

Saranya Natesan

Wayne Gaylard · Answer 5 · 2011-05-17T04:18:00

Solution 1

Try this.listBox1.DataContext = mygroup[i]; instead of ItemsSource. ItemsSource is used for binding in your XAML file.

Hope this helps

Posted 17-May-11 4:18am

Wayne Gaylard