从函数返回 CookieContainer

Question

我正在创建一个应用程序来在网站的登录部分执行一些不同的操作。

为此，我必须为我发出的所有请求维护一个连续的 Cookie 会话。

到目前为止，我已经通过 HttpWebRequest 成功连接到网站，并且响应也证实了这一点，但是我无法重用 cookie。

我已经阅读了所有内容，并找到了指示如何在同一函数或类中使用 cookie 的主题，但我需要能够在多个不同的函数中使用 cookie。

我的第一个想法是尝试从初始登录函数返回 cookie 容器，然后将其作为参数传递给每个后续函数，但我就是无法让它继续下去。

有人能建议更好的方法或我可以实现这一目标的方法吗？

Answer 1

经过大量在线阅读后，我最终自己找到了解决方案。看来我第一次尝试时不起作用的原因是由于我配置了错误的其他设置。

因此，对于可能遇到同样问题的其他人，希望这会有所帮助：

public const string userAgent = "Mozilla/5.0 (Windows NT 6.1; rv:7.0.1) Gecko/20100101 Firefox/7.0.1";
public CookieContainer cookieJar;

private void Login_Click(object sender, EventArgs e)
{
    cookieJar = Login();
}

private CookieContainer Login()
{
    string username = txtUsername.Text;
    string password = txtPassword.Text;

    // Create a request using the provied URL. 
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(loginPageURL);

    // Set the Method property of the request to POST.
    request.Method = "POST";

    // Set the Cookiecontainer
    CookieContainer cookieJar = new CookieContainer();
    request.CookieContainer = cookieJar;

    // Create POST data and convert it to a byte array.
    string postData = "username=" + username + "&password=" + password;
    byte[] byteArray = Encoding.UTF8.GetBytes (postData);

    // Set the ContentType property of the WebRequest.
    request.ContentType = "application/x-www-form-urlencoded";

    // Set the User Agent
    request.UserAgent = userAgent;

    // Set the ContentLength property of the WebRequest.
    request.ContentLength = byteArray.Length;

    // Get the request stream.
    Stream dataStream = request.GetRequestStream ();

    // Write the data to the request stream.
    dataStream.Write (byteArray, 0, byteArray.Length);

    // Close the Stream object.
    dataStream.Close ();

    // Get the response.
    HttpWebResponse response = (HttpWebResponse)request.GetResponse();

    // Get the stream containing content returned by the server.
    dataStream = response.GetResponseStream ();

    // Open the stream using a StreamReader for easy access.
    StreamReader reader = new StreamReader (dataStream);

    // Read the content.
    string responseFromServer = reader.ReadToEnd ();

    string cookie = cookieJar.GetCookieHeader(request.RequestUri);

    // Clean up the streams.
    reader.Close();
    dataStream.Close();
    response.Close();

    return cookieJar;
}

private void viewPage(CookieContainer cookieJar, string pageURL)
{ 
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(pageURL);

    // Set the ContentType property of the WebRequest.
    request.ContentType = "application/x-www-form-urlencoded";

    // Set the Method property of the request to POST.
    request.Method = "POST";

    // Set the User Agent
    request.UserAgent = userAgent;

    // Put session back into CookieContainer
    request.CookieContainer = cookieJar;

    // Get the request stream.
    Stream dataStream = request.GetRequestStream();

    // Close the Stream object.
    dataStream.Close();

    // Get the response.
    HttpWebResponse response = (HttpWebResponse)request.GetResponse();

    // Get the stream containing content returned by the server.
    dataStream = response.GetResponseStream();

    // Open the stream using a StreamReader for easy access.
    StreamReader reader = new StreamReader(dataStream);

    // Read the content.
    string responseFromServer = reader.ReadToEnd();
}