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  • C#教程之WinForm项目开发中WebBrowser用法实例汇总

本文实例汇总了WinForm项目开发中WebBrowser用法，希望对大家项目开发中使用WebBrowser起到一定的帮助，具体用法如下：

1.

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[PermissionSet(SecurityAction.Demand, Name = "FullTrust")]
[ComVisibleAttribute(true)]
public partial class frmWebData : Form
{
public frmWebData()
{
  InitializeComponent();
}
protected override void OnLoad(EventArgs e)
{
  wbService.ObjectForScripting = this;
  base.OnLoad(e);
}
}

2.后台调用Javascript脚本

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<script type="text/javascript" language="javascript">
function ErrorMessage(message) {
  document.getElementById("error").innerText = message;
}
</script>
后台代码
 
static string ErrorMsg = string.Empty;
private void wbService_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
  if (!string.IsNullOrEmpty(ErrorMsg))
 wbService.Document.InvokeScript("ErrorMessage", new object[1] { string.Format("操作失败，原因:{0}！", ErrorMsg) });
}

3.JavaScript脚本调用后台方法

脚本代码

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  <div id="content">
 <h2 id="error">
   操作正在响应中.....</h2>
 <div class="utilities">
   <a class="button right"
onclick="window.external.DoSvrWebDbBack()">

刷新

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</a>
   <!--<a class="button right"
 onclick="window.external.NavigateToLogin()">重新登录</a>-->
   <div class="clear">
   </div>
 </div>
  </div>

后台代码

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public void DoSvrWebDbBack()
{
  try
  {
  }
  catch (TimeoutException)
  {
 ErrorMsg = "超时，请稍候再尝试！";
  }
  catch (Exception ex)
  {
 ErrorMsg = ex.Message.ToString();
  }
}

4.设置cookie

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Cookie _cookie = BaseWinForm.LoginMessage.SessionID2;
   InternetSetCookie(BaseWinForm.LoginMessage.SvrWebDbBack, "ASP.NET_SessionId", _cookie.Value);
   wbService.Navigate(BaseWinForm.LoginMessage.SvrWebDbBack, null, null, string.Format("Referer:{0}", BaseWinForm.LoginMessage.SvrWebDbLoingUrl));
[DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern bool InternetSetCookie(string urlName, string cookieName, string cookieData);

5.请求链接获取返回处理

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public class HttpWebRequestToolV2
{
public delegate HttpWebRequest RequestRule(string url);
/// <summary>
/// 发起HttpWebResponse请求
/// </summary>
/// <param name="url">请求连接</param>
/// <param name="credentials">请求参数</param>
/// <param name="httpWebRequestRule">请求设置『委托』，当委托等于NULL的时候，默认请求；否则使用所设置的HttpWebRequest</param>
/// <returns>HttpWebResponse</returns>
public static HttpWebResponse CreateHttpWebRequest(string url, byte[] credentials, RequestRule httpWebRequestRule)
{
  if (string.IsNullOrEmpty(url))
 throw new ArgumentNullException("url");
 
  HttpWebRequest _request = null;
  if (httpWebRequestRule != null)
  {
 _request = httpWebRequestRule(url);
  }
  else
  {
 _request = WebRequest.Create(url) as HttpWebRequest;
 _request.Method = "POST";
 _request.ContentType = "application/x-www-form-urlencoded";
 _request.CookieContainer = new CookieContainer();
  }
 
  if (credentials != null)
  {
 _request.ContentLength = credentials.Length;
 using (var requestStream = _request.GetRequestStream())
 {
   requestStream.Write(credentials, 0, credentials.Length);
 }
  }
  return _request.GetResponse() as HttpWebResponse;
}
 
/// <summary>
/// 创建验证凭证
/// eg:
/// IDictionary<string, string> _requestCredentials = new Dictionary<string, string>();
///_requestCredentials.Add("UserName", _userName);
///_requestCredentials.Add("PassWord", _userPwd);
///_requestCredentials.Add("MacAddress", _macAddress);
///byte[] _credentials = HttpWebRequestToolV2.CreateCredentials(_requestCredentials, Encoding.UTF8);
/// </summary>
/// <returns></returns>
public static byte[] CreateCredentials(IDictionary<string, string> credentials, Encoding encoding)
{
  if (credentials == null)
 throw new ArgumentNullException("credentials");
  if (credentials.Count == 0)
 throw new ArgumentException("credentials");
  if (encoding == null)
 throw new ArgumentNullException("encoding");
 
  StringBuilder _credentials = new StringBuilder();
  foreach (KeyValuePair<string, string> credential in credentials)
  {
 _credentials.AppendFormat("{0}={1}&", credential.Key, credential.Value);
  }
  string _credentialsString = _credentials.ToString().Trim();
  int _endIndex = _credentialsString.LastIndexOf('&');
  if (_endIndex != -1)
 _credentialsString = _credentialsString.Substring(0, _endIndex);
  return encoding.GetBytes(_credentialsString);
 
}

使用示例

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public static HttpWebRequest RequestSetting(string url)
{
  HttpWebRequest _request = null;
  _request = WebRequest.Create(url) as HttpWebRequest;
  _request.Method = "POST";
  _request.ContentType = "application/x-www-form-urlencoded";
  _request.Timeout = 1000 * 10;//超时五秒
  _request.CookieContainer = new CookieContainer();
  return _request;
}
 
/// <summary>
/// 登录web网页验证
/// </summary>
/// <param name="url">超链接</param>
/// <param name="_userName">用户名</param>
/// <param name="_userPwd">密码</param>
/// <param name="_macAddress">MAC地址</param>
/// <param name="sessionID">会话</param>
/// <returns>网页登录验证是否成功『失败，将抛出网页验证验证失败信息』</returns>
public bool ProcessRemoteLogin(string url, string _userName, string _userPwd, string _macAddress, out Cookie sessionID)
{
 
  bool _checkResult = false;
  string _errorMessage = string.Empty;
  //--------------------创建登录凭证--------------------
  IDictionary<string, string> _requestCredentials = new Dictionary<string, string>();
  _requestCredentials.Add("UserName", _userName);
  _requestCredentials.Add("PassWord", _userPwd);
  _requestCredentials.Add("MacAddress", _macAddress);
 
  byte[] _credentials = HttpWebRequestToolV2.
CreateCredentials
 
(_requestCredentials, Encoding.UTF8);
  //-----------------------------------------------------
 
  CookieCollection _cookie = null;
  /*
   *LoginType 1:成功 0：失败
   *Err 失败原因
   */
  using (HttpWebResponse _httpRespone = HttpWebRequestToolV2.
CreateHttpWebRequest
 
(url, _credentials, RequestSetting))
  {
 _cookie = new CookieCollection();
 if (_httpRespone.Cookies.Count > 0)
   _cookie.Add(_httpRespone.Cookies);
  }
  //-------------------------------------------------------
  Cookie _loginType = _cookie["LoginType"];
  sessionID = _cookie["ASP.NET_SessionId"];
  Cookie _err = _cookie["Err"];
  if (_loginType != null && _err != null && sessionID != null)
  {
 _checkResult = _loginType.Value.Equals("1");
 if (!_checkResult)
   _errorMessage = HttpUtility.UrlDecode(_err.Value);
  }
  else
  {
 _errorMessage = "Web服务异常，请稍候在试！";
  }
  if (!string.IsNullOrEmpty(_errorMessage))
 throw new Exception(_errorMessage);
  return _checkResult;
}

6.从WebBrowser中获取CookieContainer

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/// <summary>
/// 从WebBrowser中获取CookieContainer
/// </summary>
/// <param name="webBrowser">WebBrowser对象</param>
/// <returns>CookieContainer</returns>
public static CookieContainer GetCookieContainer(this WebBrowser webBrowser)
{
  if (webBrowser == null)
 throw new ArgumentNullException("webBrowser");
  CookieContainer _cookieContainer = new CookieContainer();
 
  string _cookieString = webBrowser.Document.Cookie;
  if (string.IsNullOrEmpty(_cookieString)) return _cookieContainer;
 
  string[] _cookies = _cookieString.Split(';');
  if (_cookies == null) return _cookieContainer;
 
  foreach (string cookieString in _cookies)
  {
 string[] _cookieNameValue = cookieString.Split('=');
 if (_cookieNameValue.Length != 2) continue;
 Cookie _cookie = new Cookie(_cookieNameValue[0].Trim().ToString(), _cookieNameValue[1].Trim().ToString());
 _cookieContainer.Add(_cookie);
  }
  return _cookieContainer;
}


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