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使用基于表单的身份验证从网站读取 XML 文件

发布于 2024-10-20 14:06:37 字数 74 浏览 0 评论 0原文

是否有一种标准方法可以从使用基于表单的身份验证的网站读取 XML 文件？我们想要将该文件读入桌面应用程序。

谢谢-戴夫

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只涨不跌 2024-10-27 14:06:37

如果您正在谈论 ASP.NET 表单身份验证，这将是两个步骤过程：

向登录页面发送 HTTP 请求，发送用户名和密码并捕获服务器发送的身份验证 Cookie
向返回 XML 文件的脚本发送 HTTP 请求，随请求一起发送身份验证 Cookie

以下是使用自定义的示例WebClient：

public class CookieAwareWebClient : WebClient
{
    public CookieContainer Cookies { get; private set; }
    public CookieAwareWebClient()
    {
        Cookies = new CookieContainer();
    }

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

class Program
{
    static void Main()
    {
        using (var client = new CookieAwareWebClient())
        {
            client.UploadValues("http://www.foo.com/login.aspx", new NameValueCollection
            {
                { "username", "foo" },
                { "password", "secret" },
            });
            client.DownloadFile("http://www.foo.com/foo.xml", "foo.xml");
        }
    }
}

当然，在现实生活中情况可能是这样更复杂，因为根据站点的不同，您可能需要随请求一起发送 ViewState 和其他 ASP.NET 特定的废话。

If you are talking about ASP.NET Forms Authentication this will be a two step process:

Send an HTTP request to the login page sending the username and password and capturing the authentication cookie sent by the server
Send an HTTP request to the script returning the XML file sending the authentication cookie along with the request

Here's an example using a custom WebClient:

public class CookieAwareWebClient : WebClient
{
    public CookieContainer Cookies { get; private set; }
    public CookieAwareWebClient()
    {
        Cookies = new CookieContainer();
    }

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

class Program
{
    static void Main()
    {
        using (var client = new CookieAwareWebClient())
        {
            client.UploadValues("http://www.foo.com/login.aspx", new NameValueCollection
            {
                { "username", "foo" },
                { "password", "secret" },
            });
            client.DownloadFile("http://www.foo.com/foo.xml", "foo.xml");
        }
    }
}

Of course in the real life things might be more complex because depending on the site you might need to send along ViewState and other ASP.NET specific crap along with the request.

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