Yahoo！の形態素解析API用のライブラリ。簡易的に同期版もある。

gistfile1.cs

using System;
using System.Net;
using System.Xml.Linq;
using System.Linq;
using System.Collections.Generic;

namespace MyLib.WebAPI.Yahoo
{
    public static class YahooAPI
    {
        public static string Appid { get; set; }

    }

    /// <summary>
    /// http://developer.yahoo.co.jp/webapi/jlp/ma/v1/parse.html 参照
    /// </summary>
    public class KeitaisoAPI
    {

        public void Parse(string sentence, string filter, string results, Action<ParseResult> endAction)
        {
            string baseUrl = "http://jlp.yahooapis.jp/MAService/V1/parse";
            var post = "appid=" + YahooAPI.Appid + "&sentence=" + Uri.EscapeUriString(sentence) + "&filter=" + filter + "&result=" + results;

            WebClient wc = new WebClient();
            wc.UploadStringAsync(new Uri(baseUrl), post);
            wc.UploadStringCompleted += (s, e) =>
            {

                var root = XElement.Parse(e.Result);
                var ns = root.GetDefaultNamespace();
                var list = root.Descendants(ns + "word").Select(n => new Word() { Surface = n.Element(ns + "surface").Value, Pos = n.Element(ns + "pos").Value, Reading = n.Element(ns + "reading").Value });
                ParseResult pr = new ParseResult() { Text = sentence, Words = list.ToList() };
                endAction(pr);
            };
        }

        public ParseResult ParseSynchronous(string sentence, string filter, string results)
        {
            bool flag = true;
            ParseResult pr = null;
            Parse(sentence, filter, results, (n) => { pr = n; flag = false; });
            while (flag)
            {
                System.Threading.Thread.Sleep(10);
            }
            return pr;

        }

        public void Keyphrase(string sentence, Action<KeyphraseResults> endAction, object tag)
        {
            string baseUrl = "http://jlp.yahooapis.jp/KeyphraseService/V1/extract";
            var post = "appid=" + YahooAPI.Appid + "&sentence=" + Uri.EscapeUriString(sentence);

            WebClient wc = new WebClient();
            wc.UploadStringAsync(new Uri(baseUrl), post);
            wc.UploadStringCompleted += (s, e) =>
            {
                var root = XElement.Parse(e.Result);
                var ns = root.GetDefaultNamespace();
                var list = root.Descendants(ns + "Result").Select(n => new KeyphraseResult() { Keyphrase = n.Element(ns + "Keyphrase").Value, Score = double.Parse(n.Element(ns + "Score").Value) });

                endAction(new KeyphraseResults() { Results = list.ToList(), Tag = tag });
            };
        }

        /// <summary>
        /// Keyphrase取得の同期版
        /// </summary>
        /// <param name="sentence"></param>
        /// <returns></returns>
        public List<KeyphraseResult> KeyphraseSynchronous(string sentence)
        {
            string baseUrl = "http://jlp.yahooapis.jp/KeyphraseService/V1/extract";
            var post = "appid=" + YahooAPI.Appid + "&sentence=" + Uri.EscapeUriString(sentence);

            bool flag = true;
            WebClient wc = new WebClient();
            wc.UploadStringAsync(new Uri(baseUrl), post);
            List<KeyphraseResult> list = new List<KeyphraseResult>();
            wc.UploadStringCompleted += (s, e) =>
            {
                var root = XElement.Parse(e.Result);
                var ns = root.GetDefaultNamespace();
                list = root.Descendants(ns + "Result").Select(n => new KeyphraseResult() { Keyphrase = n.Element(ns + "Keyphrase").Value, Score = double.Parse(n.Element(ns + "Score").Value) }).ToList();
                flag = false;
            };

            while (flag)
            {
                System.Threading.Thread.Sleep(10);
            }
            return list;
        }


        public class KeyphraseResult
        {
            public string Keyphrase { get; set; }
            public double Score { get; set; }
        }

        public class KeyphraseResults
        {
            public List<KeyphraseResult> Results { get; set; }
            public object Tag { get; set; }
        }

        public class Word
        {
            public string Surface { get; set; }
            public string Reading { get; set; }
            public string Pos { get; set; }
        }

        public class ParseResult
        {
            public string Text { get; set; }
            public List<Word> Words { get; set; }
        }
    }
}