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WinForm项目开发中WebBrowser用法实例汇总

2019年07月18日  | 移动技术网IT编程  | 我要评论

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.

[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

<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

  <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

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

后台代码

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

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

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

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

/// <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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