Does the appsettings file attribute override what is in the app.config?
One of the best answers on the subject is here: ASP.NET web.config: configSource vs. file attributes - Credit to @Massimiliano Peluso
file
attribute
- Specifies a relative path to an external file that contains custom application configuration settings
- specific to the
appSettings
section - will merge (and override) settings in the .config file
- will not cause web application to restart when modifying the specified file
- http://msdn.microsoft.com/en-US/library/ms228154(v=vs.100).aspx
- Using the Configuration.AppSettings.Settings.Add API will result in all settings being merged back into the main
.config
on a Configuration.Save call. - since .NET 1.1
- Exception is not thrown if file does not exist.
configSource
attribute
- can apply to most sections of a configuration file, not just
appSettings
- will override the entire section with the external file, no merging
- CAN cause web application to restart
- http://msdn.microsoft.com/en-US/library/system.configuration.sectioninformation.configsource(v=vs.100).aspx
- Using the Configuration.AppSettings.Settings.Add API will result in all settings being added to the file specified in
configSource
on a Configuration.Save call. - since .NET 2.0
System.Configuration.ConfigurationErrorsException
is thrown if config source file does not exist.
The file
attribute specifies an external file containing custom settings like you do in the appSettings entry of the web.config file.
Meanwhile, the external file specified in the configSource
attribute contains the settings for the section which you declare the configSource for. For example, if you use the configSource attribute of the pages section, then the external file will contain the settings for the pages section.
The custom settings declared in the external config specifified in the file attribute will be merged with the settings in the appSettings section in the web.config file. In the meanwhile, the configSource does not support merging, it means that you'll have to move the entire section settings into the external file.
http://www.codeproject.com/Messages/1463547/Re-difference-between-configSource-and-file-attrib.aspx
- If the file doesn't exist it will not crash, it will just be ignored.
- The external config has to contain the
<appSettings>
node so your first example is correct. - The value in the external file will take priority, if no value is present then the app.config value is used.
Does that cover off everything?