Is it possible to pass a file stream back in a WebResourceRequest and have it close it when WebView2 is done with it?

[roa-nyx]

Consider the following code:

	private void webView_WebResourceRequested(object? sender, CoreWebView2WebResourceRequestedEventArgs e)
	{
		e.Response = webView.CoreWebView2.Environment.CreateWebResourceResponse(File.Open("C:\\abc.html", FileMode.Open, FileAccess.Read, FileShare.Read), 200, "Ok", "");
	}

Doing this results in the contents of abc.html being rendered in the webview, HOWEVER, even after the full stream has been processed by the webview the stream passed in is not disposed.

I know one solution would be for me to stream the entire file into a memorystream before passing it back to e.Response and closing the original filestream, however for large files this would be prohibitive and slow.

As such I'm wondering if one of the following two resolutions are possible?

• Resolution 1: Provide another argument on the CreateWebResourceResponse function called to the tune of "closeStreamWhenDone" or something to that effect, that will ensure that WebView2, calls the close function once it is completed with the stream
• Resolution 2: Add some kind of event on the response that indicates when the response has been completed, so we can do our own cleanup.

The other solution that I can think of is making my own stream that wraps the FileStream, and auto closes the underlying stream when it reaches the end. This is only really safe to do if WebView2 never uses the Seek or Position to investigate the file once the end of the stream has been reached (which I think is safe to assume, but I still think there is likely a cleaner solution that can be incorporated directly into WebView2).

Or maybe there is another cleaner solution I didn't even think of? Would love any suggestions here too.

[novac42]

Thanks for reaching out. I've assigned this to a dev that can help follow up on this.

[robincodex]

Is there a solution to this problem now?

[AFatNiBBa]

Anything new?