fix WpfDemo: image not displayed

[pinkli]

1. fix WpfDemo: image not displayed;
2. upgrade console app to .Net 5

[GihanSoft]

@pinkli Tanks. I just merged your PR to my own fork 😅.

[pinkli]

@GihanSoft you're welcome.

[vers-one]

Sorry for a delayed response. Could you post a link to a EPUB file that reproduces this issue (assuming it's not under copyright restrictions)?

[pinkli]

https://molaware.oss-cn-beijing.aliyuncs.com/photographer-book-test.epub see this epub, images will not show in html content pages.

[vers-one]

Thank you for providing a sample EPUB file. The change in the GetFullPath method looks good to me. If you extract it into a separate pull request, I will merge it right away.

As for the change in the OnStylesheetLoad method — I couldn't reproduce it with any of the EPUB files I have. All font-family CSS properties are handled properly for all the files I tested. Do you have a sample EPUB file that causes HtmlRenderer to throw an exception for a font-family property?

Still looking into the schema parsing changes.

[vers-one]

I will close and reopen this pull request to restart the build check.

[vers-one]

GetFullPath change was implemented in 147c690 and the EPUB 3 cover support was added in this PR #49.

Thank you for your contribution!