1、根据元素ID获取元素的值。

比如要获取<img class="" id="regimg" src="http://www.mamicode.com/register/checkregcode.html?1287068791" width="80" height="22">这个标签里的src属性的值：

mshtml.IHTMLDocument2 doc2 = (mshtml.IHTMLDocument2)webBrowser1.Document; mshtml.IHTMLElement img = (mshtml.IHTMLElement)doc2.all.item("regimg", 0);

string imgUrl = (string)img.getAttribute("src");

2、填写表单，并确定

mshtml.IHTMLElement loginname = (mshtml.IHTMLElement)doc2.all.item("loginname", 0);     mshtml.IHTMLElement loginPW = (mshtml.IHTMLElement)doc2.all.item("password", 0);     mshtml.IHTMLElement loginBT = (mshtml.IHTMLElement)doc2.all.item("formsubmit", 0);     mshtml.IHTMLElement loginYZ = (mshtml.IHTMLElement)doc2.all.item("regcode", 0);     loginname.setAttribute("value", tbLoginName.Text);
loginPW.setAttribute("value", tbLoginPassWord.Password); 
loginYZ.setAttribute("value", tbYZ.Text);    
loginBT.click(); 

3、获取源码

textBox1.Text = doc2.body.innerHTML;

4、执行JS

mshtml.IHTMLWindow2 win = (mshtml.IHTMLWindow2)doc2.parentWindow;
win.execScript("changeRegImg()", "javascript");//使用JS

5、禁止JS，WPF下目前发现唯一适用的一种方法：

public void HideScriptErrors(WebBrowser wb, bool Hide)   
{
    FieldInfo fiComWebBrowser = typeof(WebBrowser).GetField("_axIWebBrowser2", BindingFlags.Instance | BindingFlags.NonPublic);

    if (fiComWebBrowser == null) return;

    object objComWebBrowser = fiComWebBrowser.GetValue(wb);

    if (objComWebBrowser == null) return;

    objComWebBrowser.GetType().InvokeMember("Silent", BindingFlags.SetProperty, null,objComWebBrowser, new object[] { Hide });

}

   void webBrowser1_Navigated(object sender, NavigationEventArgs e)   
{

    HideScriptErrors(webBrowser1,  true);

}

WPF的webBrowser控件关键代码