使用C＃Httpclient从异步GET获取下载进度/当前下载的字节

Question

I'm trying to get some download progress represented in Xamarin using System.Web.Http's httpclient. I understand in the typical case to get the file size in advance with a HEAD request and checking for the content-length of the file in question. What I don't understand is how to get the currently transferred file size so I can compare that against the total.

Is this possible? I've looked around for other examples, but they seem to be making use of WebClient or other such instead.

Edit:

submitButton.Clicked += async (object sender, EventArgs e) => {
var client = new HttpClient();

var url = (Just making use of a sizable wallpaper here as example.);

var result = await client.GetStreamAsync(url);
}

If I await the GetStreamAsync as above, then I can't perform any operations on the stream until it's done. If I remove the await and try to work with the Task result, the same thing takes place - even trying to get a Length won't work until the entire thing is completed anyway.

Obviously if I can get at the stream as it's being written to, I can check the length (hopefully) and just compare that to the header information. But how to access that mid-transfer, I do not get.

Answer 1

Unfortunately, the best solution I've been able to find for this so far is "use Webclient instead of httpclient". I haven't been able to give Webclient a shot yet in Xamarin, and hopefully it will work there, but I managed to get progress working with it on the PC in a straightforward manner.