I'm trying to make 2 list boxes where I can press on a button to add an item selected from the left listbox to the right listbox. Here's the XAML for the listboxes:
<ListBox
x:Name="LeftList"
Foreground="{StaticResource Foreground}"
HorizontalAlignment="Left"
Height="237" Margin="15,103,0,0"
VerticalAlignment="Top"
Width="128">
<ListBoxItem>360T</ListBoxItem>
<ListBoxItem>BARX</ListBoxItem>
<ListBoxItem>BNP</ListBoxItem>
<ListBoxItem>BOA</ListBoxItem>
<ListBoxItem>CITI</ListBoxItem>
<ListBoxItem>CS</ListBoxItem>
<ListBoxItem>DB</ListBoxItem>
<ListBoxItem>GS</ListBoxItem>
<ListBoxItem>JPM</ListBoxItem>
<ListBoxItem>RBS</ListBoxItem>
<ListBoxItem>UBS</ListBoxItem>
</ListBox>
<ListBox
x:Name="RightList"
Foreground="{StaticResource Foreground}"
HorizontalAlignment="Left"
Height="237" Margin="257,103,0,0"
VerticalAlignment="Top"
Width="128"/>
C#:
List<string> leftSideList = new List<string>();
List<string> rightSideList = new List<string>();
public ChooseLPWindow()
{
InitializeComponent();
//Add to the collection leftside list
leftSideList.Add("360T");
leftSideList.Add("BARX");
leftSideList.Add("BNP");
leftSideList.Add("BOA");
leftSideList.Add("CITI");
leftSideList.Add("CS");
leftSideList.Add("DB");
leftSideList.Add("GS");
leftSideList.Add("JPM");
leftSideList.Add("RBS");
leftSideList.Add("UBS");
}
private void AddBtn_Click(object sender, RoutedEventArgs e)
{
if (LeftList.SelectedIndex > -1)
{
int SelectedIndex = LeftList.SelectedIndex;
string SelectedItem = LeftList.SelectedValue.ToString();
//Add the selected item to the right side list
RightList.Items.Add(SelectedItem);
rightSideList.Add(SelectedItem);
if (leftSideList != null)
{
//Remove the item from the collection list
leftSideList.RemoveAt(SelectedIndex);
//Update the left side list
LeftList.Items.Clear();
LeftList.ItemsSource = leftSideList;
}
}
}
I get the exception on:
LeftList.Items.Clear();
This happens when I try to add a second item the first one gets added but then the exception occurs when you try to add another item. The error is:
Operation is not valid while ItemsSource is in use. Access and modify elements with ItemsControl.ItemsSource
Any suggestions?
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