// 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;
}
