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HtmlElement tbUserid = webBrowser1.Document.GetElementById("uin_tips");
HtmlElement tbPasswd = webBrowser1.Document.GetElementById("pwd_tips");
HtmlElement btnSubmit = webBrowser1.Document.GetElementById("login_button");
然后赋值
tbUserid.SetAttribute("value", "123456");
tbPasswd.SetAttribute("value", "123456");
但是输入框并没有东西<label for="un">用户名:</label><input type="text" id="un" />