C#访问网页的办法很多，一般使用WebClient、WebBrowser或者HttpWebRequest。前两种比较简单，后者功能更多，方便我们伪造访问痕迹。
下面是HttpWebRequest带cookies访问百度首页的方法，访问结果如下图所示：
C#HttpWebRequest带cookies访问网页
从上图红线框中可以看出，带上cookies可以达到模拟登陆的效果，顺便模拟了浏览器，下面是C#代码。
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/// <summary>
/// 获取页面html
/// </summary>
/// <param name="uri">访问url</param>
/// <param name="refererUri">来源url</param>
/// <param name="encodingName">编码名称 例如：gb2312</param>
/// <returns></returns>
public string Get(string uri, string refererUri, string encodingName)
{
string html = string.Empty;
CookieContainer cookieContainer = new CookieContainer();
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
cookieContainer.Add(new Cookie("BAIDUID", "67017F5C6A5EE8351192F7D34E7A221E:FG=1", "", "www.baidu.com"));
cookieContainer.Add(new Cookie("PSTM", "1523879243", "", "www.baidu.com"));
cookieContainer.Add(new Cookie("BIDUPSID", "A29EA919049CED566C183C7ED175C6AB", "", "www.baidu.com"));
cookieContainer.Add(new Cookie("BD_UPN", "1a314353", "", "www.baidu.com"));
cookieContainer.Add(new Cookie("BDUSS", "1F4Wk1EUUxEWkNEZS1lUWdSNkFWOW5IbThoYXNYcktMWmhmRkE5MkxvQU9Jd0piQVFBQUFBJCQAAAAAAAAAAAEAAAD9qTIYw867wzGw19K5AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA6W2loOltpaY", "", "www.baidu.com"));
request.ContentType = "text/html;charset=" + encodingName;
request.Method = "Get";
request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.26 Safari/537.36 Core/1.63.5221.400 QQBrowser/10.0.1125.400";
request.CookieContainer = cookieContainer;
if (!string.IsNullOrEmpty(refererUri))
request.Referer = refererUri;
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
{
using (Stream streamResponse = response.GetResponseStream())
{
using (StreamReader streamResponseReader = new StreamReader(streamResponse, Encoding.GetEncoding(encodingName)))
{
html = streamResponseReader.ReadToEnd();
}
}
}
return html;
}
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