Question

我使用此代码登录并下载所需文件大约半年，现在它已经开始抛出异常参数“{0}”不能是空字符串。参数名称：cookie.Domain ，我查了谷歌，这是一个很受欢迎的问题，但我不明白为什么？以前一切都还好，而且我没有改变任何程序代码，但是有什么可以改变铁路运输饼干，所以我的程序现在无法理解它们？

        CookieContainer cookies = new CookieContainer();
        CookieAwareWebClient http = new CookieAwareWebClient(cookies);

        string sLogin = "name=_______&password=_______&dobav2_login=_______";
        http.Headers["Content-type"] = "application/x-www-form-urlencoded";
        http.Headers["User-Agent"] = "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.121 Safari/535.2";

        string sResponse = http.UploadString("https://www.railwagonlocation.com/en/index.php", sLogin);
        richTextBox1.Text = sResponse;


        http.DownloadFile("https://www.railwagonlocation.com/export_excel.php?export_type=vagon_list&l=en", "D:\\my_excel.xlsx");

AwareClient

 public class CookieAwareWebClient : WebClient
    {
    public CookieContainer CookieContainer { get; set; }
    public Uri Uri { get; set; }

    public CookieAwareWebClient()
        : this(new CookieContainer())
    {
    }

    public CookieAwareWebClient(CookieContainer cookies)
    {
        this.CookieContainer = cookies;
    }

    protected override WebRequest GetWebRequest(Uri address)
    {
        WebRequest request = base.GetWebRequest(address);
        if (request is HttpWebRequest)
        {
            (request as HttpWebRequest).CookieContainer = this.CookieContainer;
        }
        HttpWebRequest httpRequest = (HttpWebRequest)request;
        httpRequest.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
        return httpRequest;
    }

    protected override WebResponse GetWebResponse(WebRequest request)
    {
        WebResponse response = base.GetWebResponse(request);
        String setCookieHeader = response.Headers[HttpResponseHeader.SetCookie];

        if (setCookieHeader != null)
        {
            //do something if needed to parse out the cookie.
            if (setCookieHeader != null)
            {
                Cookie cookie = new Cookie(); //create cookie
                this.CookieContainer.Add(cookie);
            }
        }
        return response;
    }
}

在线出错

  this.CookieContainer.Add(cookie);

此外，我们如何在此处 cookie.Domain 参数

                Cookie cookie = new Cookie(); //create cookie
                this.CookieContainer.Add(cookie);

如果我们刚刚创建了新的cookie？

Answer 1

好吧，你要做的就是创建一个空cookie，你没有设置域名，名称或值，这就是CookieContainer在你尝试添加它时所检查的内容。因此，一种解决方案是设置该cookie的值。但是，由于您在GetRequest覆盖中已经引用了CookieContainer，因此您不必对响应中使用的Set-Cookie标头执行任何操作，CookieContainer应该已经添加了这些Cookie。

CookieAwareWebClient参数不能为零

1 个答案: