Windows Phone 8 Development notes

1. "system. unauthorizedaccessexception" Exception
Cause: Generally, the corresponding capability is added.

Solution: select the corresponding capability option in the "function" option under "wmappmanifest. xml.

2. Enable the "Fast resume" function for the WP8 Program

Cause: after the program is returned to the background, click the program icon or the tile program on the foreground desktop to restart

Solution: Use the XML editor to modify wmappmanifest. xml.

XAML apps

<DefaultTask Name="_default" NavigationPage="MainPage.xaml" ActivationPolicy="Resume"/>

Direct3d apps

<DefaultTask Name="_default" ImagePath="PhoneDirect3DApp1.exe" ImageParams=""  ActivationPolicy="Resume"/>

Topic: this function has been implemented in wp7.0, but it was canceled in wp7.1. Now WP8 has slipped around and returned.

3. In WP8 development, medialibrary is used to obtain the number of root picturealbum of all images in the media library.

Cause: the <capability name = "id_cap_medialib_photo"/> capability is missing.

Solution: Modify wmappmanifest. xml and select <capability name = "id_cap_medialib_photo"/>.

The difference between WP8 and WP7 is that you need to manually select the corresponding capabilities when using a specific API.