AppDelegate.cs

using System;
using System.Collections.Generic;
using System.Linq;
using MonoTouch.Foundation;
using MonoTouch.UIKit;

namespace LinguisticTagger
{
	// The UIApplicationDelegate for the application. This class is responsible for launching the
	// User Interface of the application, as well as listening (and optionally responding) to
	// application events from iOS.
	[Register ("AppDelegate")]
	public partial class AppDelegate : UIApplicationDelegate
	{
		// class-level declarations
		UIWindow window;
		readonly string statement = "A quick movement of the enemy will jeopardise six gunboats";
		readonly List<Tuple<string, string>> words = new List<Tuple<string, string>> ();

		public override bool FinishedLaunching (UIApplication app, NSDictionary options)
		{
			// create a new window instance based on the screen size
			window = new UIWindow (UIScreen.MainScreen.Bounds);
			window.MakeKeyAndVisible ();

			TagWords ();

			return true;
		}

		void TagWords ()
		{
			var options = NSLinguisticTaggerOptions.JoinNames
			              | NSLinguisticTaggerOptions.OmitWhitespace;
			var tagger = new NSLinguisticTagger (
				             NSLinguisticTagger.GetAvailableTagSchemesForLanguage ("en"), 
				             options);
			tagger.AnalysisString = statement;
			tagger.EnumerateTagsInRange (new NSRange (0, statement.Length), NSLinguisticTag.SchemeLexicalClass, options, TaggerEnumerator);
			PrintResult ();
		}

		void TaggerEnumerator (NSString tag, NSRange tokenRange, NSRange sentenceRange, ref bool stop)
		{
			var word = statement.Substring (tokenRange.Location, tokenRange.Length);
			words.Add (new Tuple<string, string> (tag, word));
		}

		void PrintResult ()
		{
			var items = from word in words
			            group word.Item2 by word.Item1 into g
			            select new { Tag = g.Key, Words = g.ToList ()};

			foreach (var item in items) {
				Console.WriteLine ("{0}: {1}", item.Tag, string.Join (",", item.Words));
			}
		}
	}
}