Unable to open configSource file that was added as

问题:

In my MVC application I use external config files to keep clean web.config. Some files are common and I added them to project as link from one location. For those files I set Copy option to Copy always and those files are copied to destination folder and I see them. But when I try to open home page in the browser I see "Unable to open configSource file" error. When I remove links to files and just add them (no link) everything works good. Any idea what may cause this error?

回答1:

Finally I found what was the issue. When use Copy always, files are copied to bin folder. But files are searched in the virtual directory not in the bin. So I added post build task which copies files to correct destination.

回答2:

I added the post build event as suggested. But the exact steps are:

1. Right click on the project and navigate to properties
2. Click on the Build Events tab
3. In the Post-build event command line: box I added:

xcopy /s "$(ProjectDir)\bin\Config" "$(ProjectDir)\Config"

回答3:

After trying the xcopy solution, which failed, the follow worked for me:

Right click the cstrings.config, go to Properties.

Set the property Copy to Output Directory value to Copy always

回答4:

I suffered from the same problem. In my case, config file's 'Build Action' property was the cause. ( Right click on the config file > Properties > Build Action )

The 'Build Action' value was set to 'None'. After I changed it to 'Content', the problem sovled. ( I am not sure if it was 'a Visual Studio's bug' or 'my click-by-mistake' that made it set to 'None'.

回答5:

See https://stackoverflow.com/a/38408867/2240453 Long story short: You can add

<connectionStrings configSource="bin\Connections.config">  
</connectionStrings>

to differentiate configuration (deploy/release so debug/deploy version) You can add transformation . It's quite handy to use them anyway.

(Yes, i know the topic is solved, but maybe someone will find this information useful as I did)