Initial import

1 files changed, 60 insertions, 0 deletions

diff --git a/Xamarin.Forms.Platform.WinRT/WindowsSerializer.cs b/Xamarin.Forms.Platform.WinRT/WindowsSerializer.cs
new file mode 100644
index 00000000..4e0ad794
--- /dev/null
+++ b/Xamarin.Forms.Platform.WinRT/WindowsSerializer.cs
@@ -0,0 +1,60 @@
+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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