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I never know what to specify for the target value in nuspec files to say what version the nuget package works with. Please add some documentation specifying what to place for the target value. I see things like target="lib/MonoAndroid403" but it would be nice if this was documented. Does this mean the package works on Android 4.0.3+ or is this Xamarin v3 with Android API 3+?
Clarifying docs with a list of all possible values would rock.
The official NuGet docs have some information on this but they do not show any of the Xamarin ones, nor any of the newer frameworks added recently by Microsoft.
The main Xamarin target frameworks in use today are:
MonoTouch = iOS Classic.
Xamarin.iOS = iOS Unified.
Xamarin.Mac = Xamarin.Mac mobile framework - which is based on the same framework used by Xamarin.iOS and Xamarin.Android.
A .nuspec file that targeted all these would look something like:
<file src="Mac\bin\Release\*.dll" target="lib\Xamarin.Mac20" />
<file src="iOS\bin\Release\*.dll" target="lib\Xamarin.iOS10" />
<file src="Android\bin\Release\*.dll" target="lib\MonoAndroid10" />
<file src="iOSClassic\bin\Release\*.dll" target="lib\MonoTouch10" />
The above ignores any portable class libraries.
Most .nuspec files specify the version number of the target framework but it is optional if your assembly works with all versions of that target framework. So if your target was "lib\MonoAndroid" this would mean it works with any version of MonoAndroid.
You can specify the version with a set of numbers without a decimal point or you can specify it using decimal points. Without the decimal point NuGet will just take each number and turn it into a version by inserting a '.' between each digit.
In the above "MonoAndroid10" means "MonoAndroid 1.0". This just means the project's target framework needs to be MonoAndroid version 1.0 or higher. The version is specified in the <TargetFrameworkVersion> element in the project file.
MonoAndroid403 => MonoAndroid 4.0.3
Xamarin.iOS10 => Xamarin.iOS 1.0
Xamarin.iOS1.0 => Xamarin.iOS 1.0
So does MonoAndroid403 correspond to Android 4.0.3 or to Xamarin 4.0.3?
From the project's point of view it will correspond to the Android version your application is being compiled against.
From the docs:
"The target framework is the specific Android framework version (API level) that your app is compiled for at build time. The target framework setting communicates target API level information to Xamarin.Android for use at compile time"
For Xamarin's iOS and Mac it is the Xamarin framework version number.
I've converted this answer into a page on the website (which we'll expand in future with more info on building NuGet packages).
Thanks for the feedback (and Matt, thanks for the info!)