private async Task <MemoryStream> GetPhoto(Attachment attachment, SignWith signWith, DateTime now)
{
// 1. Found in cache?
if (this.imageCacheService.TryGet(attachment.Url, out MemoryStream stream))
{
return(stream);
}
// 2. Needs download
KeyValuePair <string, TemporaryFile> pair = await this.neuronService.Contracts.GetAttachment(attachment.Url, signWith, Constants.Timeouts.DownloadFile);
// If download has been cancelled any time _during_ download, stop here.
if (this.loadPhotosTimestamp > now)
{
pair.Value.Dispose();
return(null);
}
using (TemporaryFile file = pair.Value)
{
file.Reset();
MemoryStream ms = new MemoryStream();
await file.CopyToAsync(ms);
// 3. Save to cache
ms.Reset();
await this.imageCacheService.Add(attachment.Url, ms);
ms.Reset();
return(ms);
}
}
private async void LoadPhotos()
{
if (!(this.identity.Attachments is null))
{
int i = this.TableView.Root.IndexOf(this.ButtonSection);
TableSection PhotoSection = new TableSection();
this.TableView.Root.Insert(i++, PhotoSection);
foreach (Attachment Attachment in this.identity.Attachments)
{
if (Attachment.ContentType.StartsWith("image/", StringComparison.OrdinalIgnoreCase))
{
ViewCell ViewCell;
try
{
KeyValuePair <string, TemporaryFile> P = await App.Contracts.GetAttachmentAsync(Attachment.Url, 10000);
using (TemporaryFile File = P.Value)
{
MemoryStream ms = new MemoryStream();
File.Position = 0;
await File.CopyToAsync(ms);
ms.Position = 0;
ViewCell = new ViewCell()
{
View = new Image()
{
Source = ImageSource.FromStream(() => ms)
}
};
}
}
catch (Exception ex)
{
ViewCell = new ViewCell()
{
View = new Label()
{
Text = ex.Message
}
};
}
await Device.InvokeOnMainThreadAsync(() =>
{
PhotoSection.Add(ViewCell);
});
}
}
}
}
