public ActionResult GeekTest() { return Content(GetCaptcha(),"application/json"); } private string GetCaptcha() { var geetest = new GeetestLib("3594e0d834df77cedc7351a02b5b06a4", "b961c8081ce88af7e32a3f45d00dff84"); var gtServerStatus = geetest.preProcess(); Session[GeetestLib.gtServerStatusSessionKey] = gtServerStatus; return geetest.getResponseStr(); }
3. 校验验证码
注意，当提交form表单时，会将三个和极验有关的参数传到后台方法（geetest_challenge、geetest_validate、geetest_seccode），若验证码未验证成功，则参数为空值。
后台验证方法为：
private bool CheckGeeTestResult() { var geetest = new GeetestLib("3594e0d834df77cedc7351a02b5b06a4", "b961c8081ce88af7e32a3f45d00dff84 "); var gtServerStatusCode = (byte)Session[GeetestLib.gtServerStatusSessionKey]; var userId = (string)Session["userID"]; var challenge = Request.Form.Get(GeetestLib.fnGeetestChallenge); var validate = Request.Form.Get(GeetestLib.fnGeetestValidate); var seccode = Request.Form.Get(GeetestLib.fnGeetestSeccode); var result = gtServerStatusCode == 1 ? geetest.enhencedValidateRequest(challenge, validate, seccode, userId) : geetest.failbackValidateRequest(challenge, validate, seccode); return result == 1; }
我们可以在表单中判断验证码是否成功校验：
public ActionResult Login() { if (!CheckGeeTestResult()) return Content("no:请先完成验证操作。"); .... }