private static async Task EnsureFilesAsync(Uri uri)
{
DateTime expirationDate = DateTime.Now.Subtract(CacheDuration);
var cacheFolder = await GetCacheFolderAsync();
string fileName = BuildFileName(uri, MAXRESOLUTION, MAXRESOLUTION);
StorageFile mainFile = await cacheFolder.TryGetItemAsync(fileName) as StorageFile;
if (await IsFileOutOfDate(mainFile, expirationDate))
{
mainFile = await cacheFolder.CreateFileAsync(fileName, CreationCollisionOption.ReplaceExisting);
if (!await BitmapTools.DownloadImageAsync(mainFile, uri, MAXRESOLUTION, MAXRESOLUTION))
{
await mainFile.DeleteAsync();
return;
}
}
fileName = BuildFileName(uri, MIDRESOLUTION, MIDRESOLUTION);
var resizedFile = await cacheFolder.TryGetItemAsync(fileName) as StorageFile;
if (await IsFileOutOfDate(resizedFile, expirationDate))
{
resizedFile = await cacheFolder.CreateFileAsync(fileName, CreationCollisionOption.ReplaceExisting);
try
{
await BitmapTools.ResizeImageUniformAsync(mainFile, resizedFile, MIDRESOLUTION, MIDRESOLUTION);
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine(ex.Message);
await resizedFile.DeleteAsync();
}
}
}
private static async Task EnsureFilesAsync(Uri uri)
{
DateTime expirationDate = DateTime.Now.Subtract(CacheDuration);
var folder = await GetCacheFolderAsync();
string fileName = BuildFileName(uri, MAX_RESOLUTION, MAX_RESOLUTION);
var baseFile = await folder.TryGetItemAsync(fileName) as StorageFile;
if (await IsFileOutOfDate(baseFile, expirationDate))
{
baseFile = await folder.CreateFileAsync(fileName, CreationCollisionOption.ReplaceExisting);
if (!await BitmapTools.DownloadImageAsync(baseFile, uri, MAX_RESOLUTION, MAX_RESOLUTION))
{
await baseFile.DeleteAsync();
return;
}
}
fileName = BuildFileName(uri, 960, 960);
var file = await folder.TryGetItemAsync(fileName) as StorageFile;
if (await IsFileOutOfDate(file, expirationDate))
{
file = await folder.CreateFileAsync(fileName, CreationCollisionOption.ReplaceExisting);
try
{
await BitmapTools.ResizeImageUniformAsync(baseFile, file, 960, 960);
}
catch
{
await file.DeleteAsync();
return;
}
}
baseFile = file;
}
