I use an observable collection to save a list in my app, and use XML to save that list to isolated storage. the app is ok when i add item, but when i delete an item and restart app, it cant read the XML. I use i tools to get that XML from isolated storage and yes, its structure is wrong.
here is the code
public void saveToXML()
{
IsolatedStorageFile storage = IsolatedStorageFile.GetUserStoreForApplication();
XmlWriterSettings xmlWriterSetting = new XmlWriterSettings();
xmlWriterSetting.Indent = true;
using (storage)
{
using (IsolatedStorageFileStream fsIdea = new IsolatedStorageFileStream("Idea.xml", FileMode.OpenOrCreate, storage))
{
using (XmlWriter xWIdea = XmlWriter.Create(fsIdea, xmlWriterSetting))
{
XmlSerializer xSIdea = new XmlSerializer(typeof(ObservableCollection<IdeaViewModel>));
xSIdea.Serialize(xWIdea, App.ViewModel.ItemsIdea);
}
}
}
}
public void readFromXML()
{
IsolatedStorageFile storage = IsolatedStorageFile.GetUserStoreForApplication();
if (!storage.FileExists("Idea.xml") )
{
saveToXML();
}
using (storage)
{
using (IsolatedStorageFileStream fsIdea = new IsolatedStorageFileStream("Idea.xml", FileMode.Open, storage))
{
XmlSerializer xSIdea = new XmlSerializer(typeof(ObservableCollection<IdeaViewModel>));
App.ViewModel.ItemsIdea = xSIdea.Deserialize(fsIdea) as ObservableCollection<IdeaViewModel>;
}
}
}
and here is the wrong XML file when i deleted item and restarted app, the error is at line 9, looks like the XML file still keep a part of the deleted item ?
<?xml version="1.0" encoding="utf-8"?>
<ArrayOfIdeaViewModel xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<IdeaViewModel>
<IdeaContent>sdfsd</IdeaContent>
</IdeaViewModel>
<IdeaViewModel>
<IdeaContent>sdfds</IdeaContent>
</IdeaViewModel>
</ArrayOfIdeaViewModel>aContent>sf</IdeaContent>
</IdeaViewModel>
<IdeaViewModel>
<IdeaContent>sdfsd</IdeaContent>
</IdeaViewModel>
<IdeaViewModel>
<IdeaContent>sdfds</IdeaContent>
</IdeaViewModel>
</ArrayOfIdeaViewModel>
( i put the readFromXML() at constructor of app, the the saveToXML() at here
// Code to execute when the application is deactivated (sent to background)
// This code will not execute when the application is closing
private void Application_Deactivated(object sender, DeactivatedEventArgs e)
{
saveToXML();
}
// Code to execute when the application is closing (eg, user hit Back)
// This code will not execute when the application is deactivated
private void Application_Closing(object sender, ClosingEventArgs e)
{
// Ensure that required application state is persisted here.
saveToXML();
}