Question

我有一个Windows Phone 8应用程序，我想升级到WP8.1通用应用程序。 8.1中不支持隔离存储，如何在这种情况下升级隔离设置？

Answer 1

ApplicationData.LocalSettings - 获取本地应用数据存储中的应用程序设置容器。

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");

您可以阅读文档here

Answer 2

包含IsolatedStorageSettings的__ApplicationSettings文件将在通过商店更新时位于应用程序的本地文件夹中。
通过Visual Studio更新应用程序时不是这种情况，因为使用WinRT应用程序替换Silverlight应用程序似乎很困难。

您需要将此文件反序列化为任何已知对象，并将对象存储在其他位置。以下代码将在WinRT应用程序中获取IsolatedStorageSettings：

    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>();
    }

将隔离存储设置从WP8升级到WP8.1

2 个答案: