I can't show an error, what should I do? #3326

goodwin74 · 2020-12-17T23:29:09Z

goodwin74
Dec 17, 2020

I am using: WinForms/ Lang C# / CefSharp 86 / VS2019

I am trying to show an error when the request fails, according to the examples.

browser.LoadError += (obj, args) =>
            {
                var errorBody = "<html><body><h2 style='width:100%;text-align:center;padding-top:100px;'>Error</h2></body></html>";
                
                browser.LoadHtml(errorBody,args.FailedUrl,Encoding.UTF8,true);
            };

But this code doesn't work. On error, the browser goes into an infinite loop. It seems to me that LoadHtml itself raises an error again and circle is closed.
What to do and how to show the error correctly?
I've also tried using LoadHtml (html, base64) and it works, but the problem is the url gets ugly.
Is there any solution to load the error from FailedUrl?

amaitland · 2020-12-18T04:04:05Z

amaitland
Dec 18, 2020
Maintainer

Firstly I'd suggest ignoring Aborted requests

// Don't display an error for downloaded files.
if (args.ErrorCode == CefErrorCode.Aborted)
{
    return;
}

On error, the browser goes into an infinite loop. It seems to me that LoadHtml itself raises an error again and circle is closed.

Have you added a break point and checked what error code is being sent the second time? Sounds like your speculating rather than you've actually debugged and know for sure what's going on.

I've also tried using LoadHtml (html, base64) and it works, but the problem is the url gets ugly.

This is the approach I recommend and use. Just don't update your Address bar (or whaterver you use to display the url to your user) when the address is a Data Uri.

See #2985 for a discussion of the limitations of using LoadHtml to display errors. Until CEF supports Interstitial pages there's not a whole lot we can do.

2 replies

goodwin74 Dec 18, 2020
Author

It is a shame that CEF does not support this feature(show special pages in case of errors). Do you know if they have plans to create such an opportunity?

amaitland Dec 19, 2020
Maintainer

CEF has a feature request forum at https://magpcss.org/ceforum/viewforum.php?f=7

You can pose adding support and ask if the CEF maintainers are planning to add support.

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I can't show an error, what should I do? #3326

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I can't show an error, what should I do? #3326

goodwin74 Dec 17, 2020

Replies: 1 comment · 2 replies

amaitland Dec 18, 2020 Maintainer

goodwin74 Dec 18, 2020 Author

amaitland Dec 19, 2020 Maintainer

goodwin74
Dec 17, 2020

Replies: 1 comment 2 replies

amaitland
Dec 18, 2020
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goodwin74 Dec 18, 2020
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amaitland Dec 19, 2020
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