可以实现例如通过应用程序操作google搜索，用户输入要搜索的内容，然后在google中搜索；可以自动点击网页上的按钮等功能
1. 加入对Microsoft Internet Controls的引用；
2. 加入对Microsoft HTML Object Library的引用；
（要引入Microsoft.mshtml.dll 地址是C:\Program Files\Microsoft.NET\Primary Interop Assemblies）
3. 通过mshtml.IHTMLDocument2、SHDocVw.InternetExplorer、SHDocVw.ShellWindowsClass获取当前打开的google搜索页面的IE窗口句柄；
4. 根据3返回的句柄，获得当前打开的google页面的mshtml.IHTMLDocument2对象；
5. 根据4返回的IHTMLDocument2对象，获得搜索输入框和提交按钮（可查看google页面源文件，确认输入框和提交按钮的类型和名字）；
6. 在搜索输入框中输入要搜索的内容，并执行提交按钮的click动作即可进行搜索；
简单来说：
打开ie：
SHDocVw.ShellWindows shellWindows = new SHDocVw.ShellWindowsClass();
object objFlags = 1;
object objTargetFrameName = "";
object objPostData = "";
object objHeaders = "";
SHDocVw.InternetExplorer webBrowser1= (SHDocVw.InternetExplorer)shellWindows.Item(shellWindows.Count-1);
webBrowser1.Navigate(“http://www.google.cn”, ref objFlags, ref objTargetFrameName, ref objPostData, ref objHeaders);
(可以简略点写：object c=null; myWeb.Navigate("http://zhidao.baidu.com/",ref c,ref c,ref c,ref c); )
mshtml.IHTMLDocument2 htmlDoc = webBrowser1.Document as mshtml.IHTMLDocument2;
//...获取WebBroswer中的body代码
mshtml.HTMLDocumentClass doc=(mshtml.HTMLDocumentClass)myWeb.Document;
mshtml.HTMLBody body=(mshtml.HTMLBody)docCC.body;
string html=body.innerHTML.ToString();
//...如果里面有Form，要给里面的text填充信息
mshtml.IHTMLDocument2 doc2=(mshtml.IHTMLDocument2)myWeb.Document;
mshtml.IHTMLElementCollection inputs;
inputs=(mshtml.IHTMLElementCollection)doc2.all.tags("INPUT");
mshtml.IHTMLElement element=(mshtml.IHTMLElement)inputs.item("userName",0);
mshtml.IHTMLInputElement inputElement=(mshtml.IHTMLInputElement)element;
inputElement.value="填充信息";
//...要点击里面的某个按钮
mshtml.IHTMLDocument2 doc2=(mshtml.IHTMLDocument2)myWeb.Document;
mshtml.IHTMLElementCollection inputs;
inputs=(mshtml.IHTMLElementCollection)doc2.all.tags("INPUT");
mshtml.IHTMLElement element=(mshtml.IHTMLElement)inputs.item("SubmitBut",0);
element.click();
1、根据元素ID获取元素的值。
比如要获取<img class="" id="regimg" src="/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);
}
下面是另外一遍博客里写的比较好的
#region Search
public static void Search(string searchText)
{
SHDocVw.InternetExplorer ieWnd = GetIEWndOfGoogle();
mshtml.IHTMLDocument2 ieDoc = GetIEDocOfGoogle(ref ieWnd);
System.Diagnostics.Trace.Assert(ieDoc != null);
SearchTextInGoogle(ieDoc, searchText);
//activate ie window
SetForegroundWindow(ieWnd.HWND);
}
#endregion
#region get ie window of google page
public static SHDocVw.InternetExplorer GetIEWndOfGoogle()
{
mshtml.IHTMLDocument2 ieDoc;
SHDocVw.InternetExplorer ieWnd = null;
SHDocVw.ShellWindowsClass shellWindows = new SHDocVw.ShellWindowsClass();
foreach (SHDocVw.InternetExplorer ie in shellWindows)
{
//if it is ie window
if (ie.FullName.ToUpper().IndexOf("IEXPLORE.EXE") > 0)
{
//get the document displayed
ieDoc = (mshtml.IHTMLDocument2)ie.Document;
if (ieDoc.title.ToUpper().IndexOf("GOOGLE") >= 0)
{
ieWnd = ie;
break;
}
}
}
shellWindows = null;
return ieWnd;
}
#endregion
#region get ie document of google page
public static mshtml.IHTMLDocument2 GetIEDocOfGoogle(ref SHDocVw.InternetExplorer ieWnd)
{
object missing = null;
mshtml.IHTMLDocument2 ieDoc;
if (ieWnd == null)
{
ieWnd = new SHDocVw.InternetExplorer();
ieWnd.Visible = true;
ieWnd.Navigate("http://www.google.com", ref missing, ref missing, ref missing, ref missing);
//wait for loading completed, or using DocumentComplete Event
while (ieWnd.StatusText.IndexOf("完成") == -1)
Application.DoEvents();
}
ieDoc = (mshtml.IHTMLDocument2)ieWnd.Document;
return ieDoc;
}
#endregion
#region Search the given text in google
///// <summary>
/// search the given text in google home page
/// we can see the source file of google home page to confirm the elements we need
/// the html file of google home page is as follows
///
/// <table cellpadding=0 cellspacing=0>
/// <tr valign=top>
/// <td width=25%> </td>
/// <td align=center nowrap>
/// <input name=hl type=hidden value=zh-CN>
/// <input autocomplete="off" maxlength=2048 name=q size=55 title="Google 搜索" value="">
/// <br>
/// <input name=btnG type=submit value="Google 搜索">
/// <input name=btnI type=submit value=" 手气不错 ">
/// </td>
/// ...
///// </summary>
public static void SearchTextInGoogle(mshtml.IHTMLDocument2 ieDoc, string searchText)
{
mshtml.HTMLInputElementClass input;
//set the text to be searched
foreach (mshtml.IHTMLElement ieElement in ieDoc.all)
{
//if its tag is input and name is q(question)
if (ieElement.tagName.ToUpper().Equals("INPUT"))
{
input = ((mshtml.HTMLInputElementClass)ieElement);
if (input.name == "q")
{
input.value = searchText;
break;
}
}
}
//click the submit button to search
foreach (mshtml.IHTMLElement ieElement in ieDoc.all)
{
//if its tag is input
if (ieElement.tagName.ToUpper().Equals("INPUT"))
{
input = (mshtml.HTMLInputElementClass)ieElement;
if (input.name == "btnG")
{
input.click();
break;
}
}
}
}
#endregion
参考文章：
http://blog.csdn.net/livelylittlefish/archive/2008/08/25/2829873.aspx
http://hi.baidu.com/andyleesoft/blog/item/802e02289fcc1f94023bf66a.html
http://zhidao.baidu.com/question/48084010.html
另外一个例子
IHTMLDocument2 doc = webbrowser.Document.DomDocument as IHTMLDocument2;
IHTMLBodyElement bodyElement = doc.body as IHTMLBodyElement;
if (bodyElement != null)
{
IHTMLTxtRange range = bodyElement.createTextRange();
HTMLDocumentClass documentClass = wb1.Document.DomDocument as HTMLDocumentClass;
IHTMLElement caret_pos = documentClass.getElementById("caret_pos");
if (caret_pos != null)
{
range.moveToElementText(caret_pos);
range.select();
}
}
2011-3-14添加
给html元素添加事件
IHTMLElement ieElement = .......
((mshtml.HTMLElementEvents2_Event)ieElement).onclick += new mshtml.HTMLElementEvents2_onclickEventHandler(this.element_onClick);
public bool element_onClick(mshtml.IHTMLEventObj e)
{。。。。}
要在程序中出发html中的事件，这个想用什么eventhandler之类的，搞了半天都没有研究出来，资料又搜不到，最后用执行js的方法实现之：
js触发事件：
var oEvent = document.createEventObject();
document.getElementById('addrCity').fireEvent('onchange', oEvent);