private void RequestImageDownload(Uri imageUri, WeakReference imageSourceRef)
{
if (imageUri == null || imageSourceRef == null || imageSourceRef.Target == null)
{
return;
}
lock (_pendingRequests)
{
PrunePendingRequests();
if (_pendingRequests.ContainsKey(imageUri))
{
ImageRequest request = _pendingRequests[imageUri];
lock (request)
{
_pendingRequests[imageUri].SourceRefs.Add(imageSourceRef);
}
}
else
{
ImageRequest request = new ImageRequest(imageUri);
request.Completed += OnImageRequestCompleted;
request.SourceRefs.Add(imageSourceRef);
_pendingRequests[imageUri] = request;
try
{
request.Start();
}
catch (Exception)
{
_pendingRequests.Remove(imageUri);
}
}
}
}