// 从文件读取数据
public async Task <IEnumerable <MenuCard> > ReadMenuCardsAsync()
{
var menuCards = new List <MenuCard>();
StorageFolder folder = ApplicationData.Current.RoamingFolder;
StorageFileQueryResult result = folder.CreateFileQuery();
var queryOptions = new QueryOptions();
queryOptions.IndexerOption = IndexerOption.DoNotUseIndexer;
queryOptions.FolderDepth = FolderDepth.Shallow;
queryOptions.FileTypeFilter.Add(".xml");
result.ApplyNewQueryOptions(queryOptions);
IReadOnlyList <StorageFile> files = await result.GetFilesAsync();
foreach (var file in files)
{
using (Stream stream = await file.OpenStreamForReadAsync())
{
try
{
var serializer = new DataContractSerializer(typeof(MenuCardData));
object data = await Task <object> .Run(() => serializer.ReadObject(stream));
MenuCard menuCard = (data as MenuCardData).ToMenuCard();
menuCard.RestoreReferences();
menuCards.Add(menuCard);
}
catch (Exception)
{
// log exception
}
}
// read images
var imageStorage = new MenuCardImageStorage();
foreach (var menuCard in menuCards)
{
if (menuCard.ImagePath != null)
{
menuCard.Image = await imageStorage.ReadImageAsync(menuCard.ImagePath);
}
}
}
return(menuCards);
}
// 从文件读取数据
public async Task<IEnumerable<MenuCard>> ReadMenuCardsAsync()
{
var menuCards = new List<MenuCard>();
StorageFolder folder = ApplicationData.Current.RoamingFolder;
StorageFileQueryResult result = folder.CreateFileQuery();
var queryOptions = new QueryOptions();
queryOptions.IndexerOption = IndexerOption.DoNotUseIndexer;
queryOptions.FolderDepth = FolderDepth.Shallow;
queryOptions.FileTypeFilter.Add(".xml");
result.ApplyNewQueryOptions(queryOptions);
IReadOnlyList<StorageFile> files = await result.GetFilesAsync();
foreach (var file in files)
{
using (Stream stream = await file.OpenStreamForReadAsync())
{
try
{
var serializer = new DataContractSerializer(typeof(MenuCardData));
object data = await Task<object>.Run(() => serializer.ReadObject(stream));
MenuCard menuCard = (data as MenuCardData).ToMenuCard();
menuCard.RestoreReferences();
menuCards.Add(menuCard);
}
catch (Exception)
{
// log exception
}
}
// read images
var imageStorage = new MenuCardImageStorage();
foreach (var menuCard in menuCards)
{
if (menuCard.ImagePath != null)
{
menuCard.Image = await imageStorage.ReadImageAsync(menuCard.ImagePath);
}
}
}
return menuCards;
}
private async void OnUploadImage(object sender, RoutedEventArgs e)
{
// 定义选择器
var filePicker = new FileOpenPicker();
filePicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
filePicker.FileTypeFilter.Add(".jpg");
filePicker.FileTypeFilter.Add(".png");
StorageFile file = await filePicker.PickSingleFileAsync();
if (file == null) return;
var stream = await file.OpenAsync(FileAccessMode.Read);
var image = new BitmapImage();
image.SetSource(stream);
image.ImageOpened += async (sender1, e1) =>
{
if (image.PixelHeight > image.PixelWidth)
{
image.DecodePixelHeight = 900;
}
else
{
image.DecodePixelWidth = 900;
}
stream.Seek(0);
var imageStorage = new MenuCardImageStorage();
var storage = new MenuCardStorage();
info.ImageFileName = string.Format("{0}.jpg", Guid.NewGuid().ToString());
await imageStorage.WriteImageAsync(stream, info.ImageFileName);
};
image.ImageFailed += (sender1, e1) =>
{
string s = e1.ErrorMessage;
};
info.Image = image;
}
private static async Task InitSampleDataAsync()
{
var storage = new MenuCardStorage();
var imageStorage = new MenuCardImageStorage();
if (await storage.IsRoamingFolderEmpty())
{
List<MenuCard> menuCards = MenuCardRepository.GetSampleMenuCards().ToList();
foreach (var card in menuCards)
{
RandomAccessStreamReference streamRef =
RandomAccessStreamReference.CreateFromUri(new Uri(card.ImagePath));
using (IRandomAccessStreamWithContentType stream =
await streamRef.OpenReadAsync())
{
card.ImagePath = string.Format("{0}.png", Guid.NewGuid());
await imageStorage.WriteImageAsync(stream, card.ImagePath);
}
}
await storage.WriteMenuCardsAsync(menuCards);
}
}