从 url 读取 Json 而无需下载

Question

我想从 URL 中读取 Json 字符串，但是当我使用 Chrome 网页时会显示这个字符串：

当我使用 C# WebBrowser 时，它要求我下载文件以阅读 我尝试使用 WebClient DownloadString，但该站点使用登录页面中的 cookie，并显示 arlert“请求无效”：

请帮助我，如果我的英语不好，我很抱歉

更新：这是我的代码：

wbTest.Navigate("http://authen.dzogame.com:8080/LauncherLogin.aspx?gid=200");
wbTest.Document.GetElementById("tbxUserName").SetAttribute("value", "7honda");
wbTest.Document.GetElementById("tbxPassword").SetAttribute("value", "111111");
wbTest.Document.GetElementById("btnLogin").InvokeMember("click");

更新 2：我尝试获取/设置 cookie，但它不起作用。

wb.Navigate("http://authen.dzogame.com:8080/LauncherLogin.aspx?gid=200");
Wait();
id = txtID.Text;
pass = txtPassword.Text;
wb.Document.GetElementById("tbxUserName").SetAttribute("value", id);
wb.Document.GetElementById("tbxPassword").SetAttribute("value", pass);
wb.Document.GetElementById("btnLogin").InvokeMember("Click");
Wait();
string cookie = wb.Document.Cookie;
WebClient wc = new WebClient();
wc.Headers.Add(HttpRequestHeader.Cookie, cookie);
string token = wc.DownloadString("http://authen.dzogame.com:8080/ReturnLogin.ashx");

Answer 1

您尝试通过浏览器控件发送带有 cookie 的查询，但属性 cookie 不包含 httpOnly cookie => 所以您没有会话 cookie。

获取 httpOnly 有点棘手。

1. 将此代码添加到您的课程中，以便您可以获取 httpOnly cookie。

   [DllImport("wininet.dll", SetLastError = true)]
   public static extern bool InternetGetCookieEx(
   string url,
   string cookieName,
   StringBuilder cookieData,
   ref int size,
   Int32 dwFlags,
   IntPtr lpReserved);
   
   private const Int32 InternetCookieHttponly = 0x2000;
   
   /// <summary>
   /// Gets the URI cookie container.
   /// </summary>
   /// <param name="uri">The URI.</param>
   /// <returns></returns>
   public static string GetUriCookieContainer(Uri uri)
   {
       // Determine the size of the cookie
       int datasize = 8192 * 16;
       StringBuilder cookieData = new StringBuilder(datasize);
       if (!InternetGetCookieEx(uri.ToString(), null, cookieData, ref datasize, InternetCookieHttponly, IntPtr.Zero))
       {
           if (datasize < 0)
               return null;
           // Allocate stringbuilder large enough to hold the cookie
           cookieData = new StringBuilder(datasize);
           if (!InternetGetCookieEx(
               uri.ToString(),
               null, cookieData,
               ref datasize,
               InternetCookieHttponly,
               IntPtr.Zero))
               return null;
       }
       return cookieData.ToString();
   }
   

2. 你可以像下面的代码一样获取json

   private void func()
   {
       // your code for login here ....
   
   
   
   
       var urlJson = new Uri("http://authen.dzogame.com:8080/LauncherLogin.aspx?gid=200");
   
       var cookie = GetUriCookieContainer(urlJson);
   
       HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create("http://authen.dzogame.com:8080/ReturnLogin.ashx");
       request.Headers.Add(HttpRequestHeader.Cookie, cookie);
       request.Accept = "*/*";
       string jsonResponse = null;
       using (WebResponse response = request.GetResponse())
       {
           using (StreamReader streamReader = new StreamReader(response.GetResponseStream()))
           {
               jsonResponse = streamReader.ReadToEnd();
           }
       }
   }
   

Answer 2

看看这个开源 JSON 框架：http://www.newtonsoft.com/json

dynamic responseObject = JsonConvert.DeserializeObject("{\"status\":\"1\"...");