Save And Read Data From Isolated Storage in Windows Phone 7

Introduction

In this article we are going to discuss how to store a value in a XML file which will be saved as isolated storage in Windows Phone 7 and if we want to read the XML then we can read it easily. Further we need to create a XML file; for it we are using three textboxes whose value will be saved in the XML file and will be retrieved from the XML file whenever we will click on the button. It's all inside the isolated storage of the Windows Phone 7. Further The System.IO.IsolatedStorage namespace contains types that allow the creation and use of isolated stores. Further with these stores, you can read and write data that less trusted code cannot access and prevent the exposure of sensitive information that can be saved elsewhere on the file system. In such type of storage, data is stored in compartments that are isolated by the current user and by the assembly in which the code exists. Additionally, data can be isolated by domain. Roaming profiles can be used in conjunction with isolated storage so isolated stores will travel with the user's profile. Further you have to follow the steps given below to implement such functionality.

Step 1: In this step we have to take a new Windows Phone application

• Go to New-->Project
• Select template Silverlight for Windows Phone
• Choose a Windows Phone application

Step 2: In this step we have to see the code one by one first of all we will make some properties which is inside a class named person given below:

Code

public class Person
{
string f_name;
string l_name;
int age;
public string F_Name
{
get { return f_name; }
set { f_name = value; }
}
public string LastName
{
get { return l_name; }
set { l_name = value; }
}
public int Age
{
get { return age; }
set { age = value; }
}
}

Step 3: In this step we will write the code for List<person>; let us see how we will write that.

Code

private List<Person> G_P_Data()
{
List<Person> l1 = new List<Person>();
Person p = new Person();
p.F_Name = textBox1.Text;
p.L_Name = textBox2.Text;
p.Age = Convert.ToInt32(textBox3.Text);
l1.Add(p);
return l1;
}

Step 4: In this step we will write the code for the button click to save the record.

Code

private void btnSave_Click(object sender, RoutedEventArgs e)
{
// Write to the Isolated Storage
XmlWriterSettings x_W_Settings = new XmlWriterSettings();
x_W_Settings.Indent = true;
using (IsolatedStorageFile ISF = IsolatedStorageFile.GetUserStoreForApplication())
{
using (IsolatedStorageFileStream stream = ISF.OpenFile("People.xml", FileMode.Create))
{
XmlSerializer serializer = new XmlSerializer(typeof(List<Person>));
using (XmlWriter xmlWriter = XmlWriter.Create(stream, x_W_Settings))
{
serializer.Serialize(xmlWriter, GeneratePersonData());
MessageBox.Show("Data Save!!!!");
}
}
}
}

Step 5: In this step we will write code for reading from the isolated storage which is given below:

Code

private void btnRead_Click(object sender, RoutedEventArgs e)
{
try
{
using (IsolatedStorageFile ISF = IsolatedStorageFile.GetUserStoreForApplication())
{
using(IsolatedStorageFileStream str = ISF.OpenFile("People.xml", FileMode.Open))
{
XmlSerializer serializer = new XmlSerializer(typeof(List<Person>));
List<Person> l1 = (List<Person>)serializer.Deserialize(str);
this.listBox.ItemsSource = l1;
}
}
}
catch
{
//add some code here
}
}

Step 6: In this step we will write the XAML code for the application MainPage.xaml:

Code

<phone:PhoneApplicationPage
x:Class="WP7Sample.MainPage"
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"
mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="768"
FontFamily="{StaticResource PhoneFontFamilyNormal}"
FontSize="{StaticResource PhoneFontSizeNormal}"
Foreground="{StaticResource PhoneForegroundBrush}"
SupportedOrientations="Portrait" Orientation="Portrait"
shell:SystemTray.IsVisible="True">
<!--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 x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28">
<TextBlock x:Name="ApplicationTitle" Text="MY APPLICATION" Style="{StaticResource PhoneTextNormalStyle}" FontFamily="Comic Sans MS" FontSize="28" />
<TextBlock x:Name="PageTitle" Text="My app" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}" FontFamily="Comic Sans MS" FontSize="72" Foreground="#FFBFE57E" />
</StackPanel>
<!--ContentPanel - place additional content here-->
<StackPanel x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0" Background="#FF2B1608">
<ListBox x:Name="listBox">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Margin="10" >
<TextBlock Text="{Binding F_Name}"/>
<TextBlock Text="{Binding L_Name}"/>
<TextBlock Text="{Binding Age}"/>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
<TextBlock x:Name="tbx"/>
<TextBox Height="72" Name="textBox1" Text="Enter First Name" Width="460" FontFamily="Comic Sans MS" FontSize="28" Foreground="#FF1E55D1" />
<TextBox Height="72" Name="textBox2" Text="Enter Last Name" Width="460" FontFamily="Comic Sans MS" FontSize="28" Foreground="#FF2756BE" />
<TextBox Height="72" Name="textBox3" Text="Enter Id" Width="460" FontFamily="Comic Sans MS" FontSize="28" Foreground="#FF3B65C1" />
<Button Content="Save Textbox Value in XML" x:Name="btnSave" Click="btnSave_Click" Background="#00C12D9E" Foreground="#FF59965E" BorderBrush="#FFF5F542" />
<Button Content="Read XML" x:Name="btnRead" Click="btnRead_Click" BorderBrush="#FFEB8ED3" Foreground="#FFE0FF2E" />
<Button Content="Save XML without serializer" x:Name="btnSaveWithoutSerielizer" Click="btnSaveWithoutSerielizer_Click" Background="#00969D71" BorderBrush="#FF82FF79" Foreground="#FFE2AEC5" />
<Button Content="Read XML without serializer" x:Name="btnReadWithoutSerielizer" Click="btnReadWithoutSerielizer_Click" Foreground="#FFE55292" BorderBrush="#FFD3EBD6" />
</StackPanel>
</Grid>
</phone:PhoneApplicationPage>

Step 7: In this step we will write the Complete code for MainPage.xaml.cs which is given below:

Code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;
using System.Xml;
using System.IO.IsolatedStorage;
using System.Xml.Serialization;
using System.IO;
namespace WP7Sample
{
public partial class MainPage : PhoneApplicationPage
{
// Constructor
public MainPage()
{
InitializeComponent();
textBox1.Text = "";
textBox2.Text = "";
textBox3.Text = "";
}

public class Person
{
string f_name;
string l_name;
int age;

public string F_Name
{
get { return f_name; }
set { f_name = value; }
}

public string L_Name
{
get { return l_name; }
set { l_name = value; }
}

public int Age
{
get { return age; }
set { age = value; }
}
}
private void btnSave_Click(object sender, RoutedEventArgs e)
{
// Write to the Isolated Storage
XmlWriterSettings x_W_Settings = new XmlWriterSettings();
x_W_Settings.Indent = true;

using (IsolatedStorageFile ISF = IsolatedStorageFile.GetUserStoreForApplication())
{
using (IsolatedStorageFileStream stream = ISF.OpenFile("P.xml", FileMode.Create))
{
XmlSerializer serializer = new XmlSerializer(typeof(List<Person>));
using (XmlWriter xmlWriter = XmlWriter.Create(stream, x_W_Settings))
{
serializer.Serialize(xmlWriter, GeneratePersonData());
MessageBox.Show("Data Save!!!!");
}
}
}
}

private List<Person> GeneratePersonData()
{
List<Person> l1 = new List<Person>();
Person p = new Person();
p.F_Name = textBox1.Text;
p.L_Name = textBox2.Text;
p.Age = Convert.ToInt32(textBox3.Text);
l1.Add(p);
return l1;
}
private void btnRead_Click(object sender, RoutedEventArgs e)
{
try
{
using (IsolatedStorageFile ISF = IsolatedStorageFile.GetUserStoreForApplication())
{
using(IsolatedStorageFileStream str = ISF.OpenFile("P.xml", FileMode.Open))
{
XmlSerializer serializer = new XmlSerializer(typeof(List<Person>));
List<Person> l1 = (List<Person>)serializer.Deserialize(str);
this.listBox.ItemsSource = l1;
}
}
}
catch
{
//add some code here
}
}
private void btnSaveWithoutSerielizer_Click(object sender, RoutedEventArgs e)
{
using (IsolatedStorageFile ISF = IsolatedStorageFile.GetUserStoreForApplication())
{
using (IsolatedStorageFileStream isoStream = new IsolatedStorageFileStream("a.xml", FileMode.Create, ISF))
{
XmlWriterSettings settings = new XmlWriterSettings();
settings.Indent = true;
using (XmlWriter writer = XmlWriter.Create(isoStream, settings))
{
writer.WriteStartElement("p", "person", "urn:person");
writer.WriteStartElement("F_Name", "");
writer.WriteString(textBox1.Text);
writer.WriteEndElement();
writer.WriteStartElement("L_Name", "");
writer.WriteString(textBox2.Text);
writer.WriteEndElement();
writer.WriteStartElement("Age", "");
writer.WriteString(textBox3.Text);
writer.WriteEndElement();
// Ends the document
writer.WriteEndDocument();
// Write the XML to the file.
writer.Flush();
}
}
}
}
private void btnReadWithoutSerielizer_Click(object sender, RoutedEventArgs e)
{
try
{
using (IsolatedStorageFile ISF = IsolatedStorageFile.GetUserStoreForApplication())
{
IsolatedStorageFileStream Str = ISF.OpenFile("a.xml", FileMode.Open);
using (StreamReader reader = new StreamReader(Str))
{
this.tbx.Text = reader.ReadToEnd();
}
}
}
catch
{ }
}
}
}

Step 8: In this step we will see the design of the MainPage.xaml page.

Step 9: Now we have to run the Windows Phone application and the output is given below:

Output1

In is the Default Output whenever we run the application.

Output2

In this output we will enter the value in the textbox and click to save then it will display as the figure given below.

Output3

In this Output we will read the data from isolated storage

Output4

In this Output we will see that the data is retrieved to the form of XML file as given below.