异步谷歌文件上传与进度条WPF

I am uploading to Google Cloud Storage using a service account. I need to be able to display the progress of the upload in the WPF UI. Now, Whenever I try to update the ProgressBar.Value, it's not working, but when I just have the bytesSent written in Console, I can see the progress.I am uploading to Google Cloud Storage using a