public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
var item = value as ResturentItems;
if (item == null)
{
return(null);
}
var key = _md5.MD5($"ResturentItems://{item.ID}");
return(new CustomStreamImageSource()
{
Key = key,
Stream = (token) =>
{
if (token.IsCancellationRequested)
{
return null;
}
return _diskCache.TryGetStreamAsync(key);
}
});
}
public async Task <CacheStream> GetStreamAsync(string url, CancellationToken token, TimeSpan?duration = null, string key = null)
{
string filename = string.IsNullOrWhiteSpace(key) ? _md5Helper.MD5(url) : _md5Helper.MD5(key);
string filepath = await _diskCache.GetFilePathAsync(filename);
var diskStream = await _diskCache.TryGetStreamAsync(filename).ConfigureAwait(false);
if (diskStream != null)
{
return(new CacheStream(diskStream, true));
}
var memoryStream = await DownloadStreamAndCacheAsync(url, filename, filepath, token, duration).ConfigureAwait(false);
return(new CacheStream(memoryStream, false));
}
public async Task <CacheStream> GetStreamAsync(string url, CancellationToken token, TimeSpan?duration = null)
{
string filename = _md5Helper.MD5(url);
string basePath = await _diskCache.GetBasePathAsync().ConfigureAwait(false);
string filepath = basePath == null ? filename : Path.Combine(basePath, filename);
var diskStream = await _diskCache.TryGetStreamAsync(filename).ConfigureAwait(false);
if (diskStream != null)
{
return(new CacheStream(diskStream, true));
}
var memoryStream = await DownloadAndCacheAsync(url, filename, filepath, token, duration).ConfigureAwait(false);
return(new CacheStream(memoryStream, false));
}
public async Task <CacheStream> GetStreamAsync(string url, CancellationToken token, Action <DownloadInformation> onDownloadStarted, TimeSpan?duration = null, string key = null, CacheType?cacheType = null)
{
string filename = (string.IsNullOrWhiteSpace(key) ? _md5Helper.MD5(url) : _md5Helper.MD5(key))?.ToSanitizedKey();
var allowDiskCaching = AllowDiskCaching(cacheType);
if (allowDiskCaching)
{
var diskStream = await _diskCache.TryGetStreamAsync(filename).ConfigureAwait(false);
if (diskStream != null)
{
return(new CacheStream(diskStream, true));
}
}
var downloadInformation = new DownloadInformation(url, key, filename, allowDiskCaching, duration);
onDownloadStarted?.Invoke(downloadInformation);
var memoryStream = await DownloadStreamAndCacheAsync(url, filename, token, duration, cacheType).ConfigureAwait(false);
return(new CacheStream(memoryStream, false));
}
