xml serializing of saved game data

Question

I am trying to write a method to save some basing data for a game. At the moment I am trying to save data in an xml format with a parent element co

Answer 1

Implement this after reading the file, and before deserialization:

isolatedFileStream.Position = 0;

Answer 2

The code to serialize/deserialize is fine. The problem must be with your usage of the IsolatedStorageFileStream, in particular the fact that you are reusing the same stream to read and write. I'd suggest splitting it into two functions - one for saving and one for loading. Then you can call Load(), Edit(), Save(), or just Create() and Save() if the file does not exist.

Also, as mentioned it would be helpful to post the Xml as it currently exists on disk. It appears that it has been mangled by the load, save process.

I tested the serialization code in LINQPad like so:

void Main()
{
    var xml = Save();
    Console.WriteLine(xml);
    var data = Load(xml);
    Console.WriteLine("\r\nLevel count: " + data.Levels.Count.ToString());
}

// Define other methods and classes here
public struct LevelData
{
    /// <summary>
    /// The index of the level.
    /// </summary>
    [XmlElement(ElementName = "Index")]
    public int Index;

    /// <summary>
    /// The number of attempts the player has made for a particular level.
    /// </summary>
    [XmlElement(ElementName = "Attempts")]
    public int Attempts;

    /// <summary>
    /// A value describing the furthest the player has ever got within the level.
    /// </summary>
    [XmlElement(ElementName = "PercentComplete")]
    public int PercentComplete;
}

public struct Data
{
    /// <summary>
    /// The Level data object.
    /// </summary>
    [XmlArray(ElementName = "Levels")]
    public List<LevelData> Levels;
}

public string Save()
{
    Data data = new Data();
    // Create a list to store the data already saved.
    data.Levels = new List<LevelData>();

    // Initialize the new data values.
    LevelData levelData = new LevelData();
    levelData.Index = 1;
    levelData.Attempts = 3;
    levelData.PercentComplete = 50;

    // Add the level data.
    data.Levels.Add(levelData);

    // Convert the object to XML data and put it in the stream.
    XmlSerializer serializer = new XmlSerializer(typeof(Data));
    var sb = new StringBuilder();
    using (var sr = new StringWriter(sb))
    {
        // Seriaize the data.
        serializer.Serialize(sr, data);
    }
    return sb.ToString();
}

public Data Load(string xml)
{
    // Convert the object to XML data and put it in the stream.
    XmlSerializer serializer = new XmlSerializer(typeof(Data));
    using (var sr = new StringReader(xml))
    {
        return (Data)serializer.Deserialize(sr);
    }
}