Reading app.config files in a Xamarin.Forms Xaml project
While each mobile platforms do offer their own settings management api, there are no built in ways to read settings from a good old .net style app.config xml file; This is due to a bunch of good reasons reasons, notably the .net framework configuration management api being on the heavyweight side, and each platform having their own file system api.
So we built a simple PCLAppConfig library nicely nuget packaged for your immediate consumption.
This library makes use of the lovely PCLStorage library
This example assumes you are developing a Xamarin.Forms Xaml project, where you would need to access settings from your shared viewmodel.
FOR FILESYSTEM APP.CONFIG
Initialize ConfigurationManager.AppSettings on each of your platform project, just after the ‘Xamarin.Forms.Forms.Init’ statement, as per below:
iOS (AppDelegate.cs)
Xamarin.Forms.Forms.Init();
ConfigurationManager.Initialise(PCLAppConfig.FileSystemStream.PortableStream.Current);
LoadApplication(new App());
Android (MainActivity.cs)
Xamarin.Forms.Forms.Init(this, bundle);
ConfigurationManager.Initialise(PCLAppConfig.FileSystemStream.PortableStream.Current);
LoadApplication(new App());
UWP / Windows 8.1 / WP 8.1 (App.xaml.cs)
Xamarin.Forms.Forms.Init(e);
ConfigurationManager.Initialise(PCLAppConfig.FileSystemStream.PortableStream.Current);
LoadApplication(new App());
Add an app.config file to your shared PCL project, and add your appSettings entries, as you would do with any app.config file
<configuration>
<appSettings>
<add key="config.text" value="hello from app.settings!" />
</appSettings>
</configuration>
Add this PCL app.config file as a linked file on all your platform projects. For android, make sure to set the build action to ‘AndroidAsset’, for UWP set the build action to ‘Content’
Access your setting:
ConfigurationManager.AppSettings["config.text"];
FOR EMBEDDED APP.CONFIG
Initialize ConfigurationManager.AppSettings on your pcl project like below:
Assembly assembly = typeof(App).GetTypeInfo().Assembly;
ConfigurationManager.AppSettings = new ConfigurationManager(assembly.GetManifestResourceStream("DemoApp.App.config")).GetAppSettings;
Add an app.config on your shared pcl project and ensure that Build Action:EmbeddedResource, and add your appSettings entries, as you would do with any app.config
The source code and demo app are available in github
What is the purpose of NamedSize.
