How to get previous checkbox state in windows phone

Question

I have a checkbox under a listbox using the given xaml file . My xaml file:

<ListBox x:Name="notificationSettingsListBox" Grid.Row="1"   Margin="20,20,20,20" Background="#e79e38"  >
        <ListBox.ItemTemplate>
            <DataTemplate>
                <Grid Background="#055cc3" Width="500" Height="200" Margin="30,40,30,20">
                    <StackPanel Orientation="Vertical">
                        <TextBlock Text="{Binding channel_name}" Foreground="White" FontSize="31" TextAlignment="Left" TextWrapping="Wrap" Margin="0,20,10,0" />
                        <CheckBox x:Name="pushNotiOnCheckBox" Content="Enable Notification"  Checked="pushNotiOnCheckBox_Checked" Unchecked="pushNotiOnCheckBox_Unchecked"/>
                    </StackPanel>

                </Grid>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>

Suppose in my listbox i have 5 checkbox and the user just checks 2 of the checkbox. Now when the user lunches the app in next time it will show the checked state of these 2 checkbox which he previously checked.

How can i achieve that using these xaml file in windows phone ??

Answer 1

You can store the selected values in the settings. This settings are persisted by the system and you can read the values by starting your app:

Code sample (save):

var settings = IsolatedStorageSettings.ApplicationSettings;

// txtInput is a TextBox defined in XAML.
if (!settings.Contains("userData"))
{
    settings.Add("userData", txtInput.Text);
}
else
{
    settings["userData"] = txtInput.Text;
}

settings.Save();

Code sample (read):

// txtDisplay is a TextBlock defined in XAML.
if (IsolatedStorageSettings.ApplicationSettings.Contains("userData"))
{
    txtDisplay.Text = IsolatedStorageSettings.ApplicationSettings["userData"] as string;
}

More Infos: See this msdn article

Then, when you start your app/show the view: You just need to check, which values are checked in the settings and then mark the CheckBox as checked. When the Checkboxes are dynamic (not static) you better make a ViewModel to achive this.