Show ListBox Items One By One (Windows Phone)

Question

I have a ListBox, a Show Button, and a TextBlock in my Windows Phone application.

Whenever the user clicks on the Show Button, an item from the ListBox should be shown in TextBlock. If the user clicks on Show Button again, the next item should be shown.

XAML

<ListBox x:Name="FavoriteListBox"  
         SelectionChanged="FavoriteListBox_SelectionChanged"                         
         ItemContainerStyle="{StaticResource CustomListBoxItemStyle}"
         Height="300" Width="250">
    <ListBox.ItemTemplate>
         <DataTemplate>
             <TextBlock x:Name="FavoriteListBoxTextBlock" 
                        FontSize="40" FontWeight="SemiBold"
                        Text="{Binding AnswerName}"/>
         </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

<TextBlock x:Name="DisplayTextBlock"/>

<Button x:Name="ShowButton" Click="ShowButton_Click"/>

C#

private void ShowButton_Click(object sender, EventArgs e)
{
    if(FavoriteListBox != null)
     {
          // ??????
     }
}

How can achieve such functionality?

hey! there is one answer which is not visible now, but not work int currentListIndex = 0; if (FavoriteListBox.Items.Count <= currentListIndex) { DisplayTextBlock.Text = FavoriteListBox.Items[currentListIndex++].ToString(); } else { currentListIndex = 0; DisplayTextBlock.Text = FavoriteListBox.Items[0].ToString(); } — Shubham Sahu, Jan 06 '17 at 05:34

score 1 · Accepted Answer · answered Jan 06 '17 at 05:44

1

This can be quite easily using indices directly.

Suppose the list you use for the ListBox items is called listobj, then you can use the following:

private int _displayedFavoriteIndex = -1;

private void ShowButton_Click(object sender, EventArgs e)
{
    //move to the next item
    _displayedFavoriteIndex++;    
    if ( _displayedFavoriteIndex >= listobj.Count )
    {
        //we have reached the end of the list
        _displayedFavoriteIndex = 0;
    }
    //show the item
    DisplayTextBlock.Text = listobj[ _displayedFavoriteIndex ].AnswerName;
}

Note you don't have to check whether FavoriteListBox is null, because such situation will never happen - all controls are initialized with the InitializeComponent call in the constructor.

answered Jan 06 '17 at 05:44

Martin Zikmund

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Okay Your Note also very helpful Thanks you ;) – Shubham Sahu Jan 06 '17 at 05:50
one last thing when i add -- in place of ++ what should i need to do in if condition – Shubham Sahu Jan 07 '17 at 13:29
1

If you want to go backwards, you will have to check if `_displayedFavoriteIndex <= 0` and then inside the block you will have to set `_displayedFavoriteIndex = listobj.Count - 1` :-) – Martin Zikmund Jan 07 '17 at 13:48

Show ListBox Items One By One (Windows Phone)

1 Answers1