网站按钮单击空异常

尝试在 c# 中单击站点的按钮时出现空异常

这是代码：

WebBrowser webb = new WebBrowser（）;

韦伯。导航（"http://10.0.3.190:8880/guest/s/default/？id=9C：AD：97：CB：9D：15&ap=dc：9F：db：B0：AB：64&T=1456946961"）;

        HtmlElement button = webb.Document.GetElementById("connect");
        if (button == null)
        {
            MessageBox.Show(" id not found");
        }
            else if (button != null)
            {
            MessageBox.Show(" id found");
             button.InvokeMember("click");

            }
        }

按钮源

这是网站的完整 html ：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en" dir="ltr">
<head>
<title>Action Required - Guest Access</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<link rel="stylesheet" type="text/css" href="http://10.0.3.190:8880/guest/s/default/reset-min.css" />
<link rel="stylesheet" type="text/css" href="http://10.0.3.190:8880/guest/s/default/styles.css" />
<script type="text/javascript" src="http://10.0.3.190:8880/guest/s/default/js/jquery.min.js"></script>
<script type="text/javascript" src="http://10.0.3.190:8880/guest/s/default/js/guest.js"></script>
</head>
<body class="login-page">
<!-- see README.txt for HTML customization instructions -->
<div class="page-content" style="padding-top:100px;">
<div class="login-content content-box">
</div>
<div class="login-content content-box">
<form name="input" method="post" action="login">
<div class="tou-box">
<h2>Terms of Use</h2>
<div class="tou-wrapper" id="tou">
<div class="tou">
<p>Terms of Use</p>
<p>By accessing the wireless network, you acknowledge that you're of legal age, you have read and understood and agree to be bound by this agreement</p>
<ul>
<li>The wireless network service is provided by the property owners and is completely at their discretion. Your access to the network may be blocked, suspended, or terminated at any time for any reason.</li>
<li>You agree not to use the wireless network for any purpose that is unlawful and take full responsibility of your acts.</li>
<li>The wireless network is provided &quot;as is&quot; without warranties of any kind, either expressed or implied. </li>
</ul>
</div>
</div>
<fieldset class="accept-tou">
<input id="accept-tou" type="checkbox" checked="checked" name="accept-tou" value="yes" />
<label class="normal" >I accept the <a href="javascript:void(0)" id="show-tou">Terms of Use</a></label>
</fieldset>
<div class="form-controls">
<!-- submit (only for no authentication) -->
<input name="connect" type="submit" value="Connect" id="connect" class="button requires-tou" />
</div>
</div>
</form>
</div>
</div>
<script type="text/javascript">
jQuery(document).ready(function() {
jQuery('input').keypress(function(e) {
var code = (e.keyCode ? e.keyCode : e.which);
if ( (code==13) || (code==10)) {
jQuery(this).blur();
return false;
}
});
});
$(function() {
$('#tou').hide();
$('#show-tou').click(function() {
$('#tou').show();
});
$('#accept-tou').click(function() {
if (!$('#accept-tou').checked()) {
$('input.requires-tou').disable();
}
else {
$('input.requires-tou').enable();
}
})
});
</script>
</body>
</html>

冒号运算符保留在 url 中。您需要对它们进行编码（作为 %3A，或遵循以下一些建议。

这可能是重复的：使用冒号（:)在包含 ASP.NET/IIS 的网址中

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