c#WebBrowser进阶 - 派大星啊 - 博客园

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来源: c#WebBrowser进阶 – 派大星啊 – 博客园

WebBrowser的基本功能就是访问网页,但是由于它本身就不在主线程上面,所以程序判断它什么时候加载完成了,比较麻烦。为此我集合从网上找到的内容,做了一个例子。

其中包括了给WebBrowser设置cookies,点击WebBrowser中的button等功能。

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   [DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)]
   public static extern bool InternetSetCookie(string lpszUrlName, string lbszCookieName, string lpszCookieData)
   private delegate void invokeDelegate();
  public void bk()
        {
                     
            string url = "http://*******"//任意网址
            //添加cookies
            for (int i = 0; i < cookies.Count; i++)
            {
                Cookie c = cookies[i];
                InternetSetCookie(url, c.Name, c.Value);
            }
            webBrowser2.Navigate(url);
            webBrowser2.ScriptErrorsSuppressed = true;
            while (true)
            {
                Application.DoEvents();
                if (webBrowser2.ReadyState != WebBrowserReadyState.Complete)
                {
                    break;
                }
            }
        
            invokeDelegate del = new invokeDelegate(StartMethod);
            IAsyncResult ir = del.BeginInvoke(AddComplete, null);
        }   
/// <summary>
/// 委托异步
/// </summary>
/// <param name="result"></param>
private void AddComplete(IAsyncResult result)
{
invokeDelegate handler = (invokeDelegate)((AsyncResult)result).AsyncDelegate;
handler.EndInvoke(result);
}

 

上面的代码是在webBrowser2中加载网页,使用了委托异步的方法。

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private void StartMethod()
       {
          
           Thread.Sleep(7000);
       
           this.Invoke(new Action(() =>
           {
               HtmlDocument cd = webBrowser2.Document;
               string doc = webBrowser2.DocumentText;          
               int count = 0;
               HtmlElementCollection dhl1 = cd.GetElementsByTagName("input");//GetElementsByTagName得到的是点击的标记元素名称
               foreach (HtmlElement item in dhl1)
               {
                   string elemName = item.GetAttribute("name");
                   if (elemName != null || elemName.Length > 0)
                   {
                       if (elemName == "btnclick")
                       {
                           item.InvokeMember("click");
                       }                   
                   }
               }
           }));
    
        
       }

开始加入Thread.Sleep(7000);是为了给webBrowser2加载页面的时间,7s足够页面加载完成。然后在获取页面的内容,并找到btnclick进行点击。

最后贴出从txt中获取cookies的方法:

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public static CookieCollection getCookies(string path)
       {
           string cook = ReadTxt(path).Trim();
           CookieCollection cookies = new CookieCollection();
           string[] cookstr = cook.Split(';');
           foreach (string str in cookstr)
           {
               string[] cookieNameValue = str.Split('=');
               cookieNameValue[1] = cookieNameValue[1].Trim().ToString().Replace(",", "%2C");
               Cookie ck = new Cookie(cookieNameValue[0].Trim().ToString(), cookieNameValue[1].Trim().ToString());
               ck.Domain = "*******";//Host地址,可从浏览器上查看
               cookies.Add(ck);
           }
           return cookies;
       }

这样就可以实现自动加载某个网页并点击页面上的按钮了。

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