获取必应壁纸

访问网址：http://cn.bing.com/HPImageArchive.aspx?format=js&idx=0&n=1

根据上面地址的结构，我暂时研究到就三项属性有效，他们分别是

1、format，非必要。我理解为输出格式，不存在或者不等于js，即为xml格式，等于js时，输出json格式；

2、idx，非必要。不存在或者等于0时，输出当天的图片，-1为已经预备用于明天显示的信息，1则为昨天的图片，idx最多获取到前16天的图片信息；*

3、n，必要。这是输出信息的数量，比如n=1，即为1条，以此类推，至多输出8条；*

    *号注释：此处我们要注意的时，是否正常的输出信息，与n和idx有关，通过idx的值，我们就可以获得之前bing所使用的背景图片的信息了。

转载自： http://oss.so/blog/55.html

使用C#获取必应每日图片，并解析Json格式结果。

第一步：使用HttpWebRequest/HttpWebResponse获取网页内容。

using System.Net;

        string BingPictureRestfulURLTomorrow = @"http://cn.bing.com/HPImageArchive.aspx?format=js&idx=-1&n=1";
            string jsonContent = string.Empty;
            HttpWebRequest request = HttpWebRequest.Create(new Uri(BingPictureRestfulURLTomorrow)) as HttpWebRequest;
            using (HttpWebResponse response = await request.GetResponseAsync() as HttpWebResponse)
            {
                StreamReader reader = new StreamReader(response.GetResponseStream());
                jsonContent = reader.ReadToEnd();
            }

第二步：分享返回的网页内容。

{"images":[{"startdate":"20150701","fullstartdate":"201507011600","enddate":"20150702","url":"/az/hprichbg/rb/YalaNPPeafowl_ZH-CN7079851094_1920x1080.jpg","urlbase":"/az/hprichbg/rb/YalaNPPeafowl_ZH-CN7079851094","copyright":"斯里兰卡，雅拉国家公园的蓝孔雀 (© Kevin Schafer/Minden Pictures)","copyrightlink":"http://www.bing.com/search?q=%E8%93%9D%E5%AD%94%E9%9B%80&form=hpcapt&mkt=zh-cn","wp":true,"hsh":"8955f4d08658120f8e709b961a3521ab","drk":1,"top":1,"bot":1,"hs":[{"desc":"凤凰?","link":"http://www.bing.com/search?q=%E8%93%9D%E5%AD%94%E9%9B%80&FORM=hphot1&mkt=zh-cn","query":"不，它是……","locx":13,"locy":34},{"desc":"它仪态万千，","link":"http://www.bing.com/images/search?q=%E8%93%9D%E5%AD%94%E9%9B%80&FORM=hphot2&mkt=zh-cn","query":"快去瞧瞧吧。","locx":39,"locy":46},{"desc":"孔雀是印度的国鸟，","link":"http://www.bing.com/search?q=%E5%AD%94%E9%9B%80%E7%8E%8B%E6%9C%9D+%E5%8D%B0%E5%BA%A6&form=hphot3&mkt=zh-cn","query":"甚至有一个王朝都叫……","locx":63,"locy":40}],"msg":[{"title":"今日图片故事","link":"http://www.bing.com/search?q=%E8%93%9D%E5%AD%94%E9%9B%80&form=pgbar1&mkt=zh-cn","text":"神圣的国王"}]}],"tooltips":{"loading":"正在加载...","previous":"上一页","next":"下一页","walle":"此图片不能下载用作壁纸。","walls":"下载今日美图。仅限用作桌面壁纸。"}}

第三步：定义反序列化的类型。

using System.Collections.Generic;
using Newtonsoft.Json;

namespace BingPicToday.Model
{        
    public class BingPicture
    {
        [JsonProperty(PropertyName = "images")]
        public List<Img> Images;

        [JsonProperty(PropertyName = "tooltips")]
        public ToolTip ToolTips;
    }
    
    public class Img
    {
        [JsonProperty(PropertyName = "startdate")]
        public string StartDate;

        [JsonProperty(PropertyName = "fullstartdate")]
        public string FullStartDate;

        [JsonProperty(PropertyName = "enddate")]
        public string EndDate;

        [JsonProperty(PropertyName = "url")]
        public string URL;

        [JsonProperty(PropertyName = "urlbase")]
        public string UrlBase;

        [JsonProperty(PropertyName = "copyright")]
        public string CopyRight;

        [JsonProperty(PropertyName = "copyrightlink")]
        public string CopyRightLink;

        [JsonProperty(PropertyName = "wp")]
        public bool WP;

        [JsonProperty(PropertyName = "hsh")]
        public string HSH;

        [JsonProperty(PropertyName = "drk")]
        public int DRK;

        [JsonProperty(PropertyName = "top")]
        public int Top;

        [JsonProperty(PropertyName = "bot")]
        public int Bot;

        [JsonProperty(PropertyName = "hs")]
        public List<HS> HSs;

        [JsonProperty(PropertyName = "msg")]
         public List<Msg> Message;
    }

    public class HS
    {
        [JsonProperty(PropertyName = "desc")]
        public string DESC;

        [JsonProperty(PropertyName = "link")]
        public string Link;

        [JsonProperty(PropertyName = "query")]
        public string Query;

        [JsonProperty(PropertyName = "locx")]
        public int Locx;

        [JsonProperty(PropertyName = "locy")]
        public string Locy;
    }

    public class Msg
    {
        [JsonProperty(PropertyName = "title")]
        public string Title;

        [JsonProperty(PropertyName = "link")]
        public string Link;

        [JsonProperty(PropertyName = "text")]
        public string Text;
    }

    public class ToolTip
    {
        [JsonProperty(PropertyName = "loading")]
        public string Loading;

        [JsonProperty(PropertyName = "previous")]
        public string Previous;

        [JsonProperty(PropertyName = "next")]
        public string Next;

        [JsonProperty(PropertyName = "walle")]
        public string Walle;

        [JsonProperty(PropertyName = "walls")]
        public string Walls;
    }
}

第四步：将Json网页内容反序列化到类。

BingPicture today = JsonConvert.DeserializeObject<BingPicture>(jsonContent);