c#微信開發-.net 微信開發網頁授權回調如何獲取openid

.net 微信開發網頁授權回調如何獲取openid

已經獲得code現在要訪問
“https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code”
返回的JSON數據包如下：

{
"access_token":"ACCESS_TOKEN",
"expires_in":7200,
"refresh_token":"REFRESH_TOKEN",
"openid":"OPENID",
"scope":"SCOPE"
}

現在要獲取openid,怎麼在後台訪問這個鏈接回調後處理json數據，然後篩選出openid,直接賦給變量。
最終目的：string openid=回調後處理篩選好的openid。

最佳回答：

HttpWebRequest請求那個地址獲取返回的json數據然後前後截取或者建立json對應的類，用Newtonsoft.Json.Net20.dll序列化為你的類就可以訪問了。

 using System;
using System.Web;
using System.Net;
using System.IO;
using System.Text;
public class HttpSend
{
     /// <summary>
    /// GET下載頁面內容
    /// </summary>
    /// <param name="url">請求的地址</param>
    /// <param name="encoding">內容編碼</param>
    /// <returns></returns>
    public static string GetPageContent(string url, Encoding encoding)
    {
        string html=null;
        try
        {
            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
            request.Method = "GET";

            HttpWebResponse response = request.GetResponse() as HttpWebResponse;
            Stream ioStream = response.GetResponseStream();
            StreamReader sr = new StreamReader(ioStream, encoding);
            html = sr.ReadToEnd();
            sr.Close();
            ioStream.Close();
            response.Close();
        }
        catch (Exception ex) {  }
        return html;
    }
}


//使用
string html=HttpSend.GetPageContent("你的qq oauth地址",Encoding.UTF8);
string key = "\"openid\":\"";
        int startIndex = html.IndexOf(key);
        if (startIndex != -1)
        {
            int endIndex = html.IndexOf("\",", startIndex);
            string openid = html.Substring(startIndex + key.Length, endIndex - startIndex - key.Length);
            Response.Write(openid);
        }
        else
        {//找不到openid，出錯了。。
        }