ITブログ時々なんでもブログ

using System.Threading.Tasks;
using Xamarin.Forms;
namespace AppName.Views
{
    public partial class FacebookTestPage : ContentPage
    {
        //コンストラクタ省略
        //ログイン方法・アクセストークン・プロフィールの取得は前回の記事をご参考ください。
        
        /// <summary>
        /// 友達情報の一覧を取得する
        /// </summary>
        /// <param name="id">自分のID</param>
        /// <param name="accessToken">アクセストークン</param>
        /// <returns></returns>
        private async Task GetFacebookFriendsAsync(string id, string accessToken)
        {
            var requestUrl =
                "https://graph.facebook.com/" + id + "/taggable_friends" +
                "?fields=id,name,first_name,last_name,picture" +
                "&access_token=" + accessToken;

            var httpClient = new System.Net.Http.HttpClient();

            var json = await httpClient.GetStringAsync(requestUrl);
            var friendList = Newtonsoft.Json.JsonConvert.DeserializeObject<FacebookFriendList>(json);

            if (friendList == null ||
                friendList.Data.Count <= 0)
            {
                return;
            }

            foreach (var friend in friendList.Data)
            {
                var firstName = friend.First_Name;
                var lastName = friend.Last_Name;
                var picture = await httpClient.GetByteArrayAsync(friend.Picture.Data.Url);
            }
        }
    }
}

namespace AppName.ViewModels
{
    public class FacebookFriendList
    {
        public System.Collections.Generic.List<FacebookProfile> Data { get; set; }
    }
    public class FacebookProfile
    {
        public string Id { get; set; }
        public string Name { get; set; }
        public string First_Name { get; set; }
        public string Last_Name { get; set; }
        public string Email { get; set; }
        public DateTime Birthday { get; set; }
        public FacebookPicture Picture { get; set; }
        public FacebookCover Cover { get; set; }
        public FacebookAgeRange Age_Range { get; set; }
        public List<FacebookDevice> Devices { get; set; }
        public string Gender { get; set; }
        public bool Is_Verified { get; set; }
    }
    public class FacebookData
    {
        public int Height { get; set; }
        public bool Is_Silhouette { get; set; }
        public string Url { get; set; }
        public int Width { get; set; }
    }
    public class FacebookPicture
    {
        public FacebookData Data { get; set; }
    }
    public class FacebookCover
    {
        public string Id { get; set; }
        public int Offset_x { get; set; }
        public int Offset_y { get; set; }
        public string Source { get; set; }
    }
    public class FacebookAgeRange
    {
        public int Min { get; set; }
    }
    public class FacebookDevice
    {
        public string Os { get; set; }
    }
}