Store class instance - Windows store application - windows-store-apps

Question

I'm a bit new to programing a windows store app.So the question is how can I save an instance of a class in to an xml or binary file.I tried some code but it isn't working.
Hope that some one can steer me in the right direction .

Answer 1

You can serialize your instance by using this code
/// <summary>
/// Deserializes the XML.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="xml">The XML.</param>
/// <returns>The instance</returns>
public static T DeserializeXml<T>(this String xml)
{
var bytes = Encoding.UTF8.GetBytes(xml);
using (var stream = new MemoryStream(bytes))
{
var serializer = new DataContractSerializer(typeof(T));
return (T)serializer.ReadObject(stream);
}
}
/// <summary>
/// Serializes the specified instance.
/// </summary>
/// <param name="instance">The instance.</param>
/// <returns>Xml</returns>
public static String SerializeXml(this Object instance)
{
using (var stream = new MemoryStream())
{
var serializer = new DataContractSerializer(instance.GetType());
serializer.WriteObject(stream, instance);
stream.Position = 0;
using (var reader = new StreamReader(stream))
{
var result = "<?xml version='1.0' encoding='UTF-8' ?>";
result += reader.ReadToEnd();
return result;
}
}
}
Next step is to save the serialized instance text to a file.
var filename = "instance.txt";
var file = await ApplicationData.Current.LocalFolder.CreateFileAsync(filename, CreationCollisionOption.OpenIfExists);
var content = yourInstance.SerializeXml();
await FileIO.WriteTextAsync(file, content, Windows.Storage.Streams.UnicodeEncoding.Utf8);
Now there should be a file in your AppPackage-Local-Folder called instance.txt which contains the current instance serialized to xml.

Answer 2

You can use Windows.Storage to store any file, the usage is like IO operation. MSDN
IsolatedStorage is similar to this for Windows Phone apps.