Question

是否可以将基于窗口的应用程序中的某些数据发布到Web服务器？让我们务实

ASCIIEncoding encodedText = new ASCIIEncoding();
string postData = string.Format("txtUserID={0}&txtPassword={1}", txtUName.Text, txtPassword.Text);
byte[] data = encodedText.GetBytes(postData);
HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create("http://www.aimlifes.com/office/Login.aspx");
webRequest.Method = "POST";
webRequest.ContentType = "text/html";
webRequest.ContentLength = data.Length;
Stream strm = webRequest.GetRequestStream();
strm.Write(data, 0, data.Length);

txtUrlData.Text = GetPageHtml("http://www.aimlifes.com/office/ReceiveRecharge.aspx");

strm.Close();

GetPageHtml功能：

public string  GetPageHtml(String Url)
{
  WebClient wbc = new WebClient();
  return new System.Text.UTF8Encoding().GetString(wbc.DownloadData(Url));
}

我正在尝试使用给定的凭据登录xyz.com网站并在TextArea中获取html数据。 GetPageHtml()函数获取html数据。但主要问题是发布登录详细信息不起作用，我的意思是无法登录xyz.com

Answer 1

一旦登录结果返回，它就会有一个cookie（假设这是一个经过Forms认证的站点）。然后，您需要获取该cookie并在发布到受保护页面时使用该cookie。否则，它将如何知道您已通过身份验证？

Answer 2

如果该网站使用Cookie来阻止经过身份验证的用户，您可以尝试这样做：

public class CookieAwareWebClient : WebClient
{
    public CookieAwareWebClient ()
    {
        CookieContainer = new CookieContainer();
    }

    public CookieContainer CookieContainer { get; set; }

    protected override WebRequest GetWebRequest(Uri address)
    {
        var request = base.GetWebRequest(address);
        ((HttpWebRequest)request).CookieContainer = CookieContainer;
        return request;
    }
}

public class Program
{
    static void Main()
    {
        using (var client = new CookieAwareWebClient())
        {
            var values = new NameValueCollection
            {
                { "txtUserID", "foo" },
                { "txtPassword", "secret" }
            };
            // Authenticate. As we are using a cookie container
            // the user will be authenticated on the next requests
            // using this client
            client.UploadValues("http://www.aimlifes.com/office/Login.aspx", values);

            // The user is now authenticated:
            var result = client.DownloadString("http://www.aimlifes.com/office/ReceiveRecharge.aspx");
            Console.WriteLine(result);
        }
    }
}

通过编程方式使用C sharp中的Windows窗体发布表单

2 个答案: