文档真的完成了吗？
也许你和我一样，打开一个页面，听到了不少次的哒哒哒哒的声音，但是单个页面怎么会造成多次的触发DocumentCompleted函数？不信自己试试，判断文档是否真的完成，需要在这个处理函数内判断ReadyState如下：
private void WebBrowserEx_DocumentCompleted(object sender
, WebBrowserDocumentCompletedEventArgs e)
{
if (this.ReadyState == WebBrowserReadyState.Complete)
{
if (null != this.Document && null != this.OnDocumentCompleted)
{
this.OnDocumentCompleted(sender, e);
}
}
}
404错误怎么办？500错误怎么办？
正如你所猜测的，即便是页面浏览错了，在页面中还是会显示内容，还是会无耻的触发DocumentCompleted事件，那么怎么判断到底是404页面还是500页面呢？看招：
SHDocVw.WebBrowser sw = this.ActiveXInstance as SHDocVw.WebBrowser;
sw.NavigateError += sw_NavigateError;
//-----------------------------------------
void sw_NavigateError(object pDisp, ref object URL, ref object Frame
, ref object StatusCode, ref bool Cancel)
{
ErrorCodes errorcode = ErrorCodes.HTTP_STATUS_BAD_REQUEST;
foreach (ErrorCodes ecode in Enum.GetValues(typeof(ErrorCodes)))
{
if (((long)ecode) == (Int32)StatusCode)
{
errorcode = ecode;
break;
}
}
System.Console.WriteLine("Error " + URL + ">>" + errorcode);
}
上面的代码中存在一个很丑陋的转换Enum的操作，我懒得修改了，这个枚举是俺自己定义的，定义的就是错误的名字信息，如下：
1: publicenumErrorCodes:long
2: {
3: HTTP_STATUS_BAD_REQUEST=400,
4: HTTP_STATUS_DENIED=401,
5: HTTP_STATUS_PAYMENT_REQ=402,
6: HTTP_STATUS_FORBIDDEN=403,
7: HTTP_STATUS_NOT_FOUND=404,
8: HTTP_STATUS_BAD_METHOD=405,
9: HTTP_STATUS_NONE_ACCEPTABLE=406,
10: HTTP_STATUS_PROXY_AUTH_REQ=407,
11: HTTP_STATUS_REQUEST_TIMEOUT=408,
12: HTTP_STATUS_CONFLICT=409,
13: HTTP_STATUS_GONE=410,
14: HTTP_STATUS_LENGTH_REQUIRED=411,
15: HTTP_STATUS_PRECOND_FAILED=412,
16: HTTP_STATUS_REQUEST_TOO_LARGE=413,
17: HTTP_STATUS_URI_TOO_LONG=414,
18: HTTP_STATUS_UNSUPPORTED_MEDIA=415,
19: HTTP_STATUS_RETRY_WITH=449,
20: HTTP_STATUS_SERVER_ERROR=500,
21: HTTP_STATUS_NOT_SUPPORTED=501,
22: HTTP_STATUS_BAD_GATEWAY=502,
23: HTTP_STATUS_SERVICE_UNAVAIL=503,
24: HTTP_STATUS_GATEWAY_TIMEOUT=504,
25: HTTP_STATUS_VERSION_NOT_SUP=505,
26:
27: INET_E_INVALID_URL=0x800C0002L,
28: INET_E_NO_SESSION=0x800C0003L,
29: INET_E_CANNOT_CONNECT=0x800C0004L,
30: INET_E_RESOURCE_NOT_FOUND=0x800C0005L,
31: INET_E_OBJECT_NOT_FOUND=0x800C0006L,
32: INET_E_DATA_NOT_AVAILABLE=0x800C0007L,
33: INET_E_DOWNLOAD_FAILURE=0x800C0008L,
34: INET_E_AUTHENTICATION_REQUIRED=0x800C0009L,
35: INET_E_NO_VALID_MEDIA=0x800C000AL,
36: INET_E_CONNECTION_TIMEOUT=0x800C000BL,
37: INET_E_INVALID_REQUEST=0x800C000CL,
38: INET_E_UNKNOWN_PROTOCOL=0x800C000DL,
39: INET_E_SECURITY_PROBLEM=0x800C000EL,
40: INET_E_CANNOT_LOAD_DATA=0x800C000FL,
41: INET_E_CANNOT_INSTANTIATE_OBJECT=0x800C0010L,
42: INET_E_REDIRECT_FAILED=0x800C0014L,
43: INET_E_REDIRECT_TO_DIR=0x800C0015L,
44: INET_E_CANNOT_LOCK_REQUEST=0x800C0016L,
45: INET_E_USE_EXTEND_BINDING=0x800C0017L,
46: INET_E_TERMINATED_BIND=0x800C0018L,
47: INET_E_INVALID_CERTIFICATE=0x800C0019L,
48: INET_E_CODE_DOWNLOAD_DECLINED=0x800C0100L,
49: INET_E_RESULT_DISPATCHED=0x800C0200L,
50: INET_E_CANNOT_REPLACE_SFP_FILE=0x800C0300L,
51: INET_E_CODE_INSTALL_BLOCKED_BY_HASH_POLICY=0x800C0500L,
52: INET_E_CODE_INSTALL_SUPPRESSED=0x800C0400L,
53: }
Winform的WebBrowser居然不自己定义错误值，真是一个半成品啊。
让内部的Html调用的JS可以使用外部提供的C#类的函数
做起来简单。首先生成一个类(第一行不能少)
[System.Runtime.InteropServices.ComVisibleAttribute(true)]
public class A
{
public String Fun()
{
return Guid.NewGuid().ToString();
}
}
构造WebBrowser的时候设置属性 ObjectForScripting=new A();
页面中使用类似如下的代码(注意函数名为window.external)：
测试按钮
赶紧试试吧
事件调用转换成过程调用
需求是这样的，我需要做一个模拟的操作界面，包括：登录，打开特定页面，填写内容，提交几步。在事件模型之下，我需要先调用Navigate函数， 然后在DocumentCompleted的处理函数中处理每个的返回内容，这样很麻烦，能不能使用一个函数将事件处理直接屏蔽掉 （SynchronizedNavigate），我的操作转换成：
- SynchronizedNavigate(登录页面)
- 填写登录信息
- 模拟点击登录按钮
- SynchronizedNavigate(数据填充页面)
- 填写页面内容
- 提交到服务器
- 取得返回页面校验实际输入的值
1: public void SynchronizedNavigate(String strUrl)
2: {
3: this.Navigate(strUrl);
4: WaitNavigatingDone();
5: }
6:
7: public void WaitNavigatingDone()
8: {
9: while (m_isDocumentationCompleted == false)
10: {
11: Application.DoEvents();
12: Thread.Sleep(50);
13: }
14: }
怎么屏蔽内部的消息窗口？
直接看代码，很无耻滴注册了函数进去
private void WebBrowserEx_Navigated(object sender, WebBrowserNavigatedEventArgs e)
{
if (this.Document == null || this.Document.DomDocument == null)
{
return;
}
mshtml.IHTMLDocument2 doc2 = this.Document.DomDocument as mshtml.IHTMLDocument2;
if (this.BlockClientMessage)
{
if (null != doc2 && null != doc2.parentWindow)
{
//block alert and confirm
doc2.parentWindow.execScript(@"function alert(){} function confirm(){return true;}"
, "javaScript");
}
}
}
怎么屏蔽网页内部弹出内容到新窗口？
也许你可以使用Navigate的变种，里面有void Navigate(string urlString, bool newWindow)和Navigate(Uri url, bool newWindow)这两个函数，俺没有仔细试过，我使用的是COM接口：
this.Navigate("about:blank");
SHDocVw.WebBrowser sw = this.ActiveXInstance as SHDocVw.WebBrowser;
if (null != sw)
{
sw.NewWindow3 += new SHDocVw.DWebBrowserEvents2_NewWindow3EventHandler(sw_NewWindow3);
}
----------------------
void sw_NewWindow3(ref object ppDisp, ref bool Cancel, uint dwFlags, string bstrUrlContext, string bstrUrl)
{
if (null == _disibledevent=>this.BlockPopWindow)
{
Cancel = true;
this.Navigate(bstrUrl);
}
else if (null != _disibledevent=> _disibledevent=>this, bstrUrl, ref Cancel);
}
}
自定义协议？
你是不是想玩玩在用户信息的点击的时候弹出一个内部的页面，而不是默认的 Http访问？实现类似的协议很简单，在_Navigating(object sender, WebBrowserNavigatingEventArgs e)这个事件处理中处理即可：当碰到您的协议的时候，e.Cancel=true;然后生成HTML，设置DocumentText就完成了。
取得当前的选择的文本
public string SelectedText { get { IHTMLDocument2 doc = (IHTMLDocument2)this.Document.DomDocument; IHTMLTxtRange txt = (IHTMLTxtRange)doc.selection.createRange(); return txt.htmlText; } }
高亮指定的文本
1: public void HilightText(string keyword, int nindexK)
2: {
3: if (null == keyword ||
4: keyword.Trim().Length < 1 ||
5: null == this.Document ||
6: this.Document.DomDocument == null ||
7: this.IsBusy ||
8: this.IsDisposed
9: )
10: {
11: return;
12: }
13: HTMLDocument document = (HTMLDocument)this.Document.DomDocument;
14: IHTMLDOMNode bodyNode = (IHTMLDOMNode)this.Document.Body.DomElement;
15: HilightText(document, bodyNode, keyword.Trim(), nindexK);
16: }
17:
18: private void HilightText(HTMLDocument document, IHTMLDOMNode node, string keyword, int nindexK)
19: {
20: // nodeType = 3：text节点
21: if (node.nodeType == 3)
22: {
23: string nodeText = node.nodeValue.ToString();
24: // 如果找到了关键字
25: if (nodeText.Contains(keyword))
26: {
27: IHTMLDOMNode parentNode = node.parentNode;
28: // 将关键字作为分隔符，将文本分离，并逐个添加到原text节点的父节点
29: string[] result = nodeText.Split(new string[] { keyword }, StringSplitOptions.None);
30: for (int i = 0; i < result.Length - 1; i++)
31: {
32: if (result[i] != "")
33: {
34: IHTMLDOMNode txtNode = document.createTextNode(result[i]);
35: parentNode.insertBefore(txtNode, node);
36: }
37: IHTMLDOMNode orgNode = document.createTextNode(keyword);
38: IHTMLDOMNode hilightedNode = (IHTMLDOMNode)document.createElement("SPAN");
39: IHTMLStyle style = ((IHTMLElement)hilightedNode).style;
40: style.color = "black";
41: style.backgroundColor = colorTables[nindexK % colorTables.Length];
42: hilightedNode.appendChild(orgNode);
43:
44: parentNode.insertBefore(hilightedNode, node);
45: }
46: if (result[result.Length - 1] != "")
47: {
48: IHTMLDOMNode postNode = document.createTextNode(result[result.Length - 1]);
49: parentNode.insertBefore(postNode, node);
50: }
51: parentNode.removeChild(node);
52: } // End of nodeText.Contains(keyword)
53: }
54: else
55: {
56: // 如果不是text节点，则递归搜索其子节点
57: IHTMLDOMChildrenCollection childNodes = node.childNodes as IHTMLDOMChildrenCollection;
58: foreach (IHTMLDOMNode n in childNodes)
59: {
60: HilightText(document, n, keyword, nindexK);
61: }
62: }
63: }
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