CODEWITHSUNDEEP
c#xmlsilverlightwindows-phone
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Reputation: 1124

Windows Phone 8 - Error while Serializing/Deserializing XML

I have a Class A and Class B that contains List of class A objects.

public class Item
{
    public string X{ get; set; }
    public string Y{ get; set; }
}
public class ItemCollection
{
    List<Item> items = new List<Item>();
    //Some methods
}

I can serialize it by:

IsolatedStorageFileStream ifs = new IsolatedStorageFileStream("myxml.xml", FileMode.Create, isfile);
DataContractSerializer ser = new DataContractSerializer(itemlist.items.GetType());
XmlWriter writer = XmlWriter.Create(ifs);
ser.WriteObject(writer, itemlist.items);

But while deserializing it, I get "... Root element is missing." error.

IsolatedStorageFileStream ifs = new IsolatedStorageFileStream("myxml.xml", FileMode.Open, isfile);
DataContractSerializer ser = new DataContractSerializer(itemlist.Items.GetType());
XmlReader reader=XmlReader.Create(ifs);
itemlist.items= (List<Item>)ser.ReadObject(reader);

Is there any other/better way of serializing/deserializing one class that contains list/collection of another class?

Upvotes: 1

Views: 1387

Answers (1)

Marc Gravell
Marc Gravell

Reputation: 1063413

It looks to me like the problem is simply that you are wiping the file when you open it to deserialize, via FileMode.Create. So of course the root element is missing: it is empty. You probably have the FileMode.Create and FileMode.Open inverted between the serialize/deserialize. And then add a few using for good measure.

The serialize should use FileMode.Create, to truncate or create the file fresh for new data.

The deserialize should use FileMode.Open, to look at the existing data.

Upvotes: 1

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