How to create a file in application data local folder which is not hidden in windows store app?

Question

I want to create a log file in ApplicationData local folder.
     m_StorageFile = await ApplicationData.Current.LocalFolder.CreateFileAsync(m_Name.Replace(" ", "_") + ".log",
                          CreationCollisionOption.OpenIfExists);
First time when my app is launched, the file gets created and logs are written.
When I close my app, and re run the app once again, the log file that was created is now hidden and when i try to call
the code :    m_StorageFile = await ApplicationData.Current.LocalFolder.CreateFileAsync(m_Name.Replace(" ", "_") + ".log",
                          CreationCollisionOption.OpenIfExists);
m_StorageFile is NULL.
How can i prevent the file from becoming Hidden or ReadOnly.
Thanks

Answer 1

Here is a very simple sample that works fine.  Start with this and see what you are doing different.
XAML:
<Page
x:Class="LocalStorage.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:LocalStorage"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d" Loaded="Page_Loaded">
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<TextBox x:Name="outputTxt" HorizontalAlignment="Left" Margin="76,82,0,0" TextWrapping="Wrap" VerticalAlignment="Top" AllowDrop="True" PlaceholderText="No Data read from local file" Width="791"/>
<Button Content="Store Data" HorizontalAlignment="Left" Margin="73,145,0,0" VerticalAlignment="Top" Click="Button_Click" />
</Grid>
</Page>
C#
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.Storage;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238
namespace LocalStorage
/// <summary>
/// An empty page that can be used on its own or navigated to within a Frame.
/// </summary>
public sealed partial class MainPage : Page
public MainPage()
this.InitializeComponent();
private async void Button_Click(object sender, RoutedEventArgs e)
if (m_StorageFile != null)
try
string userContent = outputTxt.Text;
if (!String.IsNullOrEmpty(userContent))
await FileIO.WriteTextAsync(m_StorageFile, userContent);
else
// should be some info to write
catch (FileNotFoundException)
// do something
private StorageFile m_StorageFile;
private async void createFileOrGetFile()
m_StorageFile = await ApplicationData.Current.LocalFolder.CreateFileAsync("sample.log", CreationCollisionOption.OpenIfExists);
private async void Page_Loaded(object sender, RoutedEventArgs e)
createFileOrGetFile();
if (m_StorageFile != null)
try
string fileContent = await FileIO.ReadTextAsync(m_StorageFile);
outputTxt.Text = fileContent;
catch (FileNotFoundException)
// do something!
Jeff Sanders (MSFT)
@jsandersrocks - Windows Store Developer Solutions
@WSDevSol
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