.net 提取 json 数据代码,Asp.NET代码库,德仔网

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【Asp.NET】 .net 提取 json 数据
作者:元青 / 发布于2016/12/19/ 531
.net 提取 json 数据.
HttpHelper.cs

using System;  
using System.Collections.Generic;  
using System.Linq;  
using System.Web;  
using System.Net;  
using System.Text;  
using System.IO;  
  
namespace Weixin.Common  
{  
    public class HttpHelper  
    {  
        private const string DefaultUserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";  
  
        /// <summary>  
        /// 创建GET方式的HTTP请求    
        /// </summary>  
        /// <param name="url">请求URL</param>  
        /// <param name="timeout">请求超时时间</param>  
        /// <param name="userAgent">浏览器信息</param>  
        /// <param name="encoding">编码</param>  
        /// <param name="headers">请求头信息</param>  
        /// <param name="cookies">随同HTTP请求发送的Cookie信息，如果不需要身份验证可以为空</param>  
        /// <returns></returns>  
        public static String Get(string url, int? timeout, string userAgent, Encoding encoding, IList<KeyValuePair<string, string>> headers, CookieCollection cookies = null)  
        {  
            var reponse = CreateGetHttpResponse(url, timeout, userAgent, headers, cookies);  
            return ResponseToString(reponse, encoding);  
  
        }  
  
        /// <summary>    
        /// 创建GET方式的HTTP请求    
        /// </summary>    
        /// <param name="url">请求的URL</param>    
        /// <param name="timeout">请求的超时时间</param>    
        /// <param name="userAgent">请求的客户端浏览器信息，可以为空</param>    
        /// <param name="headers">请求的客户端浏览器头，可以为空</param>    
        /// <param name="cookies">随同HTTP请求发送的Cookie信息，如果不需要身份验证可以为空</param>    
        /// <returns></returns>    
        public static HttpWebResponse CreateGetHttpResponse(string url, int? timeout, string userAgent,  
            IList<KeyValuePair<string, string>> headers, CookieCollection cookies = null)  
        {  
            if (string.IsNullOrEmpty(url))  
            {  
                throw new ArgumentNullException("url");  
            }  
            var request = WebRequest.Create(url) as HttpWebRequest;  
            if (request == null)  
            {  
                return null;  
            }  
            request.Method = "GET";  
            request.UserAgent = DefaultUserAgent;  
            if (!string.IsNullOrEmpty(userAgent))  
            {  
                request.UserAgent = userAgent;  
            }  
            if (timeout.HasValue)  
            {  
                request.Timeout = timeout.Value;  
            }  
            if (cookies != null)  
            {  
                request.CookieContainer = new CookieContainer();  
                request.CookieContainer.Add(cookies);  
            }  
            //如果Header  
            if (headers != null)  
            {  
                foreach (var header in headers)  
                {  
                    request.Headers.Add(header.Key, header.Value);  
                }  
            }  
            return request.GetResponse() as HttpWebResponse;  
        }  
  
        public static string ResponseToString(WebResponse reponse, Encoding encoding)  
        {  
            var result = string.Empty;  
            if (reponse != null)  
            {  
                using (var stream = reponse.GetResponseStream())  
                {  
                    if (stream != null)  
                    {  
                        using (var sr = new StreamReader(stream, encoding))  
                        {  
                            result = sr.ReadToEnd();  
                        }  
                    }  
                }  
                reponse.Close();  
            }  
            return result;  
        }  
    }  
}  




使用:

string jsonUrl = "http://www.xxx.cn/api/replymsg?keywords=" + con; //得到json  
/* {"id":1,"keywords":"一图了然","title":"一图了然｜秒懂“三互”大通关建设改革方案","img":null,"link":"http://mp.weixin.qq.com/s?__***38f#rd","createTime":"\/Date(1428129560757)\/"} */    
  
string tt = HttpHelper.Get(jsonUrl, null, null, Encoding.UTF8, null, null);  
if (tt.Count() != 0)  
{  
    twxxInfo twxx = new twxxInfo();  
    try  
    {  
        twxx = JsonConvert.DeserializeObject<twxxInfo>(tt);  
    }  
    catch (Exception ex)  
    {  
        title = ex.Message;  
    }  
    string title = twxx.title;  
    string description = twxx.description;  
    string img = twxx.img;  
    string link = twxx.link;  
    string[,] kw = { { "" + title + "", "" + description + "", "" + img + "", "" + link + "" } };  
    weixinVO = getMenuHelper(kw);  
    return weixinVO;  
}  


实体类:
using System;  
using System.Collections.Generic;  
using System.Linq;  
using System.Web;  
  
namespace Weixin.Common  
{  
    public class twxxInfo  
    {  
        public int id { get; set; }  
        public string keywords { get; set; }  
        public string title { get; set; }  
        public string img { get; set; }  
        public string description { get; set; }  
        public string link { get; set; }  
        public Nullable<System.DateTime> createTime { get; set; }  
    }  
}  

若json不是上面的格式，要取其中的某个字段的值
{  
    "code": 0,  
    "data": {  
        "country": "中国",  
        "country_id": "CN",  
        "area": "华南",  
        "area_id": "800000",  
        "region": "广东省",  
        "region_id": "440000",  
        "city": "深圳市",  
        "city_id": "440300",  
        "county": "",  
        "county_id": "-1",  
        "isp": "电信",  
        "isp_id": "100017",  
        "ip": "183.**.**.***"  
    }  
}  

取city的值：
if (tt.Count() != 0)  
{  
    JObject s;  
    try  
    {  
        s = Newtonsoft.Json.JsonConvert.DeserializeObject<JObject>(tt);  
    }  
    catch (Exception ex)  
    {  
        return null;  
    }  
    string city = s["data"]["city"].ToString();  
}
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