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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Runtime.Serialization;
using System.Threading.Tasks;
using Windows.Storage;
#if WINDOWS_UWP
namespace Xamarin.Forms.Platform.UWP
#else
namespace Xamarin.Forms.Platform.WinRT
#endif
{
internal sealed class WindowsSerializer : IDeserializer
{
const string PropertyStoreFile = "PropertyStore.forms";
public async Task<IDictionary<string, object>> DeserializePropertiesAsync()
{
try
{
StorageFile file = await ApplicationData.Current.RoamingFolder.GetFileAsync(PropertyStoreFile).DontSync();
using (Stream stream = (await file.OpenReadAsync().DontSync()).AsStreamForRead())
{
if (stream.Length == 0)
return new Dictionary<string, object>(4);
var serializer = new DataContractSerializer(typeof(IDictionary<string, object>));
return (IDictionary<string, object>)serializer.ReadObject(stream);
}
}
catch (FileNotFoundException)
{
return new Dictionary<string, object>(4);
}
}
public async Task SerializePropertiesAsync(IDictionary<string, object> properties)
{
StorageFile file = await ApplicationData.Current.RoamingFolder.CreateFileAsync(PropertyStoreFile, CreationCollisionOption.ReplaceExisting).DontSync();
using (StorageStreamTransaction transaction = await file.OpenTransactedWriteAsync().DontSync())
{
try
{
Stream stream = transaction.Stream.AsStream();
var serializer = new DataContractSerializer(typeof(IDictionary<string, object>));
serializer.WriteObject(stream, properties);
await transaction.CommitAsync().DontSync();
}
catch (Exception e)
{
Debug.WriteLine("Could not move new serialized property file over old: " + e.Message);
}
}
}
}
}
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