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１．Yahooの登録

２．結果をXMLで確認

<ResultSet xmlns="urn:yahoo:jp:jlp:FuriganaService" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="urn:yahoo:jp:jlp:FuriganaService https://jlp.yahooapis.jp/FuriganaService/V1/furigana.xsd">
  <Result>
    <WordList>
      <Word>
        <Surface>山田</Surface>
        <Furigana>やまだ</Furigana>
        <Roman>yamada</Roman>
      </Word>
      <Word>
        <Surface>太郎</Surface>
        <Furigana>たろう</Furigana>
        <Roman>tarou</Roman>
      </Word>
    </WordList>
  </Result>
</ResultSet>

３．PCLの実装方法

using System.Threading.Tasks;
using System.Xml;
using System.IO;
using System.Net;
public static class YahooAPI
{
    private const string FuriganaUrl = "https://jlp.yahooapis.jp/FuriganaService/V1/furigana";
        
    public static async Task<string> GetPhonetic(string accountId, string kanji)
    {
        string result = String.Empty;
        try
        {
            //HttpWebRequestを用いた接続例
            var request = HttpWebRequest.Create(FuriganaUrl + "?appid=" + accountId + "&sentence=" + System.Net.WebUtility.UrlEncode(kanji)) as HttpWebRequest;
            request.Method = "GET";
            request.Accept = "*/*";
            using (HttpWebResponse response = await request.GetResponseAsync() as HttpWebResponse)
            {
                Stream stream = response.GetResponseStream();
                using (StreamReader reader = new StreamReader(stream, System.Text.Encoding.UTF8))
                {
                    result = reader.ReadToEnd();
                }
            }

            //取得したXMLファイルからふりがなのフィールドを抜き出して連結する
            string furigana = await Task.Run(() =>
            {
                //XMLをLinqで取得する方法
                //var doc = XDocument.Parse(result);
                //IEnumerable<string> furiganaList = from w in doc.Descendants("Word")
                //                                   select w.Attribute("Furigana").Value;
                //XMLから取得できたふりがなリストの文字列を連結する
                //return String.Join("", furiganaList);

                //Linqでうまく取得できないため
                //XmlReaderでループして読み取る
                string ret = String.Empty;
                using (XmlReader reader = XmlReader.Create(new StringReader(result)))
                {
                    while (reader.Read())
                    {
                        switch (reader.NodeType)
                        {
                            case XmlNodeType.Element:
                                if (reader.Name == "Furigana" && 
                                    reader.Read() && //進む
                                    reader.HasValue)
                                {
                                    ret += reader.Value;
                                }
                                break;
                        }
                    }
                }
                return ret;
            });
                
            return furigana;
        }
        catch (System.Net.Http.HttpRequestException hre)
        {
            System.Diagnostics.Debug.WriteLine(hre.Message + System.Environment.NewLine + hre.StackTrace);
            return String.Empty;
        }
        catch (Exception ex)
        {
            System.Diagnostics.Debug.WriteLine(ex.Message + System.Environment.NewLine + ex.StackTrace);
            return String.Empty;
        }
    }
}

４．使用方法

this.txtFirstName.Completed += (async (s, e) =>
{
    this.txtFirstNameKana.Text = await YahooAPI.GetPhonetic("YahooAppId", this.txtFirstName.Text);
});
this.txtLastName.Completed += (async (s, e) =>
{
    this.txtLastNameKana.Text = await YahooAPI.GetPhonetic("YahooAppId", this.txtLastName.Text);
});