如何使用 WebClient 登录站点? [英] How do I log into a site with WebClient?

问题描述

我想使用 C# 中的 WebClient 对象下载某些内容，但下载域要求我登录.如何使用 WebClient 登录并保留会话数据?我知道如何使用 WebClient 发布数据.

I want to download something using a WebClient object in C#, but the download domain requires me to be logged in. How can I log in and keep session data using WebClient? I know how to post data with WebClient.

推荐答案

如果您遇到的问题是您可以进行身份​​验证但无法保留身份验证 cookie，这里是 WebClient 的 cookie 感知版本.

If the problem you are having is you can authenticate but you cant keep the authentication cookie here is a cookie aware version of WebClient.

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

    protected override WebRequest GetWebRequest(Uri address)
    {
        WebRequest request = base.GetWebRequest(address);

        var castRequest = request as HttpWebRequest;
        if (castRequest != null)
        {
            castRequest.CookieContainer = this.CookieContainer;
        }

        return request;
    }
}

您给我的链接使用带有 HTTP POST 的表单身份验证，我没有时间仔细研究它，但至少它可以让您开始使用 Google.

The link you gave me uses forms authentication with HTTP POST, I don't have the time to walk though it but at least it gives you a start with Google.

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