使用BrowserSession和HtmlAgilityPack通过.NET登录Facebook

var session = new BrowserSession();
session.UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3";

var loginPageUrl = "https://www.facebook.com/login.php";
var response = session.Get(loginPageUrl);
var html = response.Content;

var doc = new HtmlDocument();
doc.LoadHtml(html);

var form = doc.DocumentNode.SelectSingleNode("//form[@id='login_form']");
var actionUrl = form.GetAttributeValue("action", "");
var inputs = form.Descendants("input");

var formData = new Dictionary<string, string>();
foreach (var input in inputs)
{
    var name = input.GetAttributeValue("name", "");
    var value = input.GetAttributeValue("value", "");
    formData[name] = value;
}

formData["email"] = "your_email";
formData["pass"] = "your_password";

var loginUrl = "https://www.facebook.com" + actionUrl;
response = session.Post(loginUrl, formData);