CODEWITHSUNDEEP
c#windows-phone-8windows-phonewindows-phone-8.1win-universal-app
Milan Aggarwal
Milan Aggarwal

Reputation: 5104

Upgrade Isolated storage settings from WP8 to WP8.1

I have a windows phone 8 app which I want to upgrade to WP8.1 universal app. Isolated Storage is not supported in 8.1, how do I upgrade my isolated settings in such case?

Upvotes: 2

Views: 1431

Answers (2)

Yves
Yves

Reputation: 782

The __ApplicationSettings file which contains the IsolatedStorageSettings will be located in the local folder of the app when it was updated through the store.
This is not the case when updating the app through Visual Studio, as it seems to have difficulties replacing a Silverlight app with a WinRT app.

You need to deserialize this file to any known objects, and the store the objects someplace else. The following code will fetch the IsolatedStorageSettings in a WinRT app:

    public static async Task<IEnumerable<KeyValuePair<string, object>>> GetIsolatedStorageValuesAsync()
    {
        try
        {
            using (var fileStream = await ApplicationData.Current.LocalFolder.OpenStreamForReadAsync("__ApplicationSettings"))
            {
                using (var streamReader = new StreamReader(fileStream))
                {
                    var line = streamReader.ReadLine() ?? string.Empty;

                    var knownTypes = line.Split('\0')
                        .Where(x => !string.IsNullOrEmpty(x))
                        .Select(Type.GetType)
                        .ToArray();

                    fileStream.Position = line.Length + Environment.NewLine.Length;

                    var serializer = new DataContractSerializer(typeof (Dictionary<string, object>), knownTypes);

                    return (Dictionary<string, object>) serializer.ReadObject(fileStream);
                }
            }
        }
        catch (FileNotFoundException)
        {
            // ignore the FileNotFoundException, unfortunately there is no File.Exists to prevent this
        }
        catch (Exception ex)
        {
            Debug.WriteLine(ex.Message);
        }
        return new Dictionary<string, object>();
    }

Upvotes: 0

Kumar
Kumar

Reputation: 864

ApplicationData.LocalSettings -- Gets the application settings container in the local app data store.

NameSpace : Windows.Storage

var localSettings = Windows.Storage.ApplicationData.Current.LocalSettings;

// Create a simple setting

localSettings.Values["exampleSetting"] = "Hello Windows";

// Read data from a simple setting

Object value = localSettings.Values["exampleSetting"];

if (value == null)
{
    // No data
}
else
{
    // Access data in value
}

// Delete a simple setting

localSettings.Values.Remove("exampleSetting");

You can read documentation here

Upvotes: 1

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