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How to: Save XMLWriter Content to Isolated Storage

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This topic shows how to use the Microsoft .NET Framework for Silverlight to save XmlWriter content to an isolated storage file.

To configure a Silverlight Visual Studio project to run this example

  1. Modify your page.xaml file so that it includes the following TextBlock element:

    <TextBlock x:Name ="OutputTextBlock" Canvas.Top ="10" TextWrapping="Wrap"/>

  2. In the page.xaml.cs (page.xaml.vb in Visual Basic) source file for your application, add the following using statements (Imports in Visual Basic):

    Imports System.Xml
Imports System.IO
Imports System.Text
Imports System.IO.IsolatedStorage

    using System.Xml;
using System.IO;
using System.Text;
using System.IO.IsolatedStorage;

Example

The code example does the following:

  • Obtains the isolated storage for the user.

  • Creates a new file in the isolated storage.

  • Uses the stream writer and an XmlWriterSettings object to create a new XmlWriter instance.

  • Writes content to the XmlWriter and calls the Flush method so that the content of XmlWriter content is written to the isolated storage.

  • Uses StreamReader to read the content of the file, and then writes the content to the page.

  • Deletes the file.

Using isoStore As IsolatedStorageFile = _
    IsolatedStorageFile.GetUserStoreForApplication()

    ' Create new file
    Using isoStream As IsolatedStorageFileStream = _
        New IsolatedStorageFileStream("IsoStoreFile.xml", _
            FileMode.Create, isoStore)

        ' Write to the Isolated Storage for the user.
        Dim settings As XmlWriterSettings = New XmlWriterSettings()
        settings.Indent = True
        ' Create an XmlWriter.
        Using writer As XmlWriter = XmlWriter.Create(isoStream, settings)
            writer.WriteComment("sample XML document")

            ' Write an element (this one is the root).
            writer.WriteStartElement("book")

            ' Write the namespace declaration.
            writer.WriteAttributeString("xmlns", "bk", Nothing, "urn:samples")

            ' Write the genre attribute.
            writer.WriteAttributeString("genre", "novel")

            ' Write the title.
            writer.WriteStartElement("title")
            writer.WriteString("The Handmaid's Tale")
            writer.WriteEndElement()

            ' Write the price.
            writer.WriteElementString("price", "19.95")

            writer.WriteStartElement(Nothing, "ISBN", "urn:samples")
            writer.WriteString("1-861003-78")
            writer.WriteEndElement()

            ' Write the style element (shows a different way to handle prefixes).
            writer.WriteElementString("style", "urn:samples", "hardcover")

            ' Write the close tag for the root element.
            writer.WriteEndElement()

            ' Write the XML to the file.
            writer.Flush()
        End Using
    End Using

    ' Open the file again for reading.
    Using reader As New StreamReader(isoStore.OpenFile("IsoStoreFile.xml", FileMode.Open))
        OutputTextBlock.Text = reader.ReadToEnd()
    End Using

    ' Delete the IsoStoreFile.xml file.
    isoStore.DeleteFile("IsoStoreFile.xml")

using (IsolatedStorageFile isoStore =
    IsolatedStorageFile.GetUserStoreForApplication())
{

    // Create new file
    using (IsolatedStorageFileStream isoStream =
        new IsolatedStorageFileStream("IsoStoreFile.xml",
            FileMode.Create, isoStore))
    {
        // Write to the Isolated Storage for the user.
        XmlWriterSettings settings = new XmlWriterSettings();
        settings.Indent = true;
        // Create an XmlWriter.
        using (XmlWriter writer = XmlWriter.Create(isoStream, settings))
        {

            writer.WriteComment("sample XML document");

            // Write an element (this one is the root).
            writer.WriteStartElement("book");

            // Write the namespace declaration.
            writer.WriteAttributeString("xmlns", "bk", null, "urn:samples");

            // Write the genre attribute.
            writer.WriteAttributeString("genre", "novel");

            // Write the title.
            writer.WriteStartElement("title");
            writer.WriteString("The Handmaid's Tale");
            writer.WriteEndElement();

            // Write the price.
            writer.WriteElementString("price", "19.95");

            writer.WriteStartElement(null, "ISBN", "urn:samples");
            writer.WriteString("1-861003-78");
            writer.WriteEndElement();

            // Write the style element (shows a different way to handle prefixes).
            writer.WriteElementString("style", "urn:samples", "hardcover");

            // Write the close tag for the root element.
            writer.WriteEndElement();

            // Write the XML to the file.
            writer.Flush();
        }
    }
    // Open the file again for reading.
    using (StreamReader reader =
                    new StreamReader(isoStore.OpenFile("IsoStoreFile.xml", FileMode.Open)))
    {
        OutputTextBlock.Text = reader.ReadToEnd();
    }


    // Delete the IsoStoreFile.xml file.
    isoStore.DeleteFile("IsoStoreFile.xml");
}

See Also

Other Resources

Isolated Storage