I am creating a Windows Phone Application but i have a small problem.
I am using the AppSettings Class from MSDN samples to save my settings and this is working fine.
BUT, inside my settings UI i have a Radio Inputs. When each Radio Input is being checked i want to make Visibility.Collaped or Visibility.Visible a TextBox. It does not allow me to do this beucause i guess when the AppSettings is being initialized and a Radio Input is checked every toolbox is null.
The Settings page is being initialized after the AppSettings so how i am gonna do this?
If i run the below code it gives me nullreferenceexception in the line:
EnterRadiusBox.Visibility = Visibility.Collapsed;
I hope you understand me.
Here is the Code i Have So Far in The Settings Page:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Navigation;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;
namespace MyAPP
{
public partial class Page1 : PhoneApplicationPage
{
public Page1()
{
InitializeComponent();
}
private void OffersFromRadius_Checked(object sender, RoutedEventArgs e)
{
EnterRadiusBox.Visibility = Visibility.Visible;
RadiusExplain.Visibility = Visibility.Visible;
}
private void OffersFromCity_Checked(object sender, RoutedEventArgs e)
{
EnterRadiusBox.Visibility = Visibility.Collapsed;
RadiusExplain.Visibility = Visibility.Collapsed;
}
}
}
And Here is my Settings.xaml
<phone:PhoneApplicationPage
x:Class="MyAPP.Page1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
FontFamily="{StaticResource PhoneFontFamilyNormal}"
FontSize="{StaticResource PhoneFontSizeNormal}"
Foreground="{StaticResource PhoneForegroundBrush}"
SupportedOrientations="Portrait" Orientation="Portrait"
mc:Ignorable="d"
xmlns:local="clr-namespace:SettingsHandle"
ApplicationBar = "{StaticResource GlobalAppBar}"
shell:SystemTray.IsVisible="True">
<phone:PhoneApplicationPage.Resources>
<local:AppSettings x:Key="appSettings"></local:AppSettings>
</phone:PhoneApplicationPage.Resources>
<!--LayoutRoot is the root grid where all page content is placed-->
<Grid x:Name="LayoutRoot" Background="Transparent">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<!--TitlePanel contains the name of the application and page title-->
<StackPanel Grid.Row="0" Margin="12,17,0,28">
<TextBlock Text="MyAPP" Style="{StaticResource PhoneTextNormalStyle}"/>
<TextBlock Text="Settings" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/>
</StackPanel>
<!--ContentPanel - place additional content here-->
<Grid x:Name="ContentPanel" Grid.Row="1" Margin="14,0,10,0">
<TextBlock HorizontalAlignment="Left" Margin="151,27,0,0" TextWrapping="Wrap" Text="Show Offers From" VerticalAlignment="Top" Height="30" Width="167"/>
<RadioButton x:Name="OffersFromCity" Content="My City" HorizontalAlignment="Left" Margin="67,57,0,0" VerticalAlignment="Top" RenderTransformOrigin="0.818,0.428" GroupName="GroupOne" IsChecked="{Binding Source={StaticResource appSettings}, Path=OffersFromCitySetting, Mode=TwoWay}" Checked="OffersFromCity_Checked" />
<RadioButton x:Name="OffersFromRadius" Content="A Radius" HorizontalAlignment="Left" Margin="246,57,0,0" VerticalAlignment="Top" GroupName="GroupOne" IsChecked="{Binding Source={StaticResource appSettings}, Path=OffersFromRadiusSetting, Mode=TwoWay}" Checked="OffersFromRadius_Checked" />
<TextBox x:Name="EnterRadiusBox" HorizontalAlignment="Left" Height="72" Margin="92,124,0,0" TextWrapping="Wrap" Text="60" VerticalAlignment="Top" Width="296" InputScope="Number" />
<TextBlock x:Name="RadiusExplain" HorizontalAlignment="Left" Margin="56,196,0,0" TextWrapping="Wrap" Text="I want to hide this value or make it visible." VerticalAlignment="Top" Height="84" Width="364" />
</Grid>
</Grid>
</phone:PhoneApplicationPage>