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POc# How to get Listbox selection from Observable Collection
 

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  1. POc# How to get Listbox selection from Observable Collection
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    <p>I'm probably not even asking this correctly, I am new to c#, but trying to help my 14 year-old son learn. I've created a listbox with items created with an ObservableCollection. Here is the XAML:</p> <pre><code>&lt;ListBox x:Name="listBox1" ItemsSource="{Binding}" Margin="105,205,886,63" IsTabStop="True" SelectionChanged="PrintText" ScrollViewer.VerticalScrollBarVisibility="Hidden" TabIndex="5" FontSize="36" Background="Transparent" Foreground="#FF55B64C" FontFamily="Arabic Typesetting" FontWeight="Bold" IsDoubleTapEnabled="False" SelectionMode="Single" &gt; &lt;ListBox.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;StackPanel Orientation="Horizontal"&gt; &lt;TextBlock Name="blockNameList" Text="{Binding name}"/&gt; &lt;TextBlock Text=" #"/&gt; &lt;TextBlock Name="blockIdList" Text="{Binding id}"/&gt; &lt;/StackPanel&gt; &lt;/DataTemplate&gt; &lt;/ListBox.ItemTemplate&gt; &lt;/ListBox&gt; </code></pre> <p>Here is how I created the ListBox Items:</p> <pre><code>var client = new HttpClient(); var uri = new Uri("http://theurlImusing"); Stream respStream2 = await client.GetStreamAsync(uri); // DataContractJsonSerializer ser2 = new DataContractJsonSerializer(typeof(RootObject)); // RootObject feed2 = (RootObject)ser2.ReadObject(respStream2); DataContractJsonSerializer ser = null; ser = new DataContractJsonSerializer(typeof(ObservableCollection&lt;RootObject&gt;)); ObservableCollection&lt;RootObject&gt; feed2 = ser.ReadObject(respStream2) as ObservableCollection&lt;RootObject&gt;; var cardList = new List&lt;RootObject&gt;(); foreach (RootObject returnfeed in feed2) { string cid = returnfeed.id; string cardname = returnfeed.name; listBox1.Items.Add(new RootObject { id=cid, name=cardname }); } </code></pre> <p>I thought I would just use the SelectionChanged="PrintText" property of the listbox so that when I clicked on a listbox item, it would just change a textblock's text value. Ultimately, that is all I am trying to do...set a textblock or textbox to be equal to the "id" value that is clicked on in the ListBox.</p> <pre><code>void PrintText(object sender, SelectionChangedEventArgs args) { //What do I put in here?? } </code></pre> <p>Thanks very much for any insight! I need it!!</p>
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    1. COA quick note... you should either bind the `ItemsSource` property of the ListBox to an `ObservableCollection` of items, or you should add items to the `ListBox.Items` collection manually. Do not do both. But you probably are looking for `listBox1.SelectedItem`, and cast it as a `RootObject`
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      1. POc# How to get Listbox selection from Observable Collection
      1. USRachel
 

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