public async void SaveData() {
var fileList = await ApplicationData.Current.LocalFolder.GetFilesAsync();
System.IO.MemoryStream ms = new System.IO.MemoryStream();
var scratchFile = await ApplicationData.Current.LocalFolder.CreateFileAsync(localScratchFileName, CreationCollisionOption.ReplaceExisting);
using (var storageTransaction = await scratchFile.OpenTransactedWriteAsync()) {
using (var dw = new Windows.Storage.Streams.DataWriter(storageTransaction.Stream)) {
dw.WriteInt32(Items.Count);
for (int x = 0; x < Items.Count; x++) {
TrackItem item = Items[x];
dw.WriteDateTime(item.Start);
dw.WriteDateTime(item.End.Value);
dw.WriteInt32(item.Topic.Length);
dw.WriteString(item.Topic);
}
if (CurrentItem == null) {
dw.WriteBoolean(false);
} else {
dw.WriteBoolean(true);
dw.WriteDateTime(CurrentItem.Start);
dw.WriteInt32(CurrentItem.Topic.Length);
dw.WriteString(CurrentItem.Topic);
}
storageTransaction.Stream.Size = await dw.StoreAsync();
await storageTransaction.CommitAsync();
}
}
await scratchFile.RenameAsync(localFileName, NameCollisionOption.ReplaceExisting);
}