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我正在尝试从网站中提取一些数据，但提交按钮仅在文档完成事件中第一次调用。加载第一个提交的页面文档完成事件后不执行我的代码是

 private void b_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
    {
        WebBrowser b = sender as WebBrowser;
        string response = "";
        response = b.DocumentText;
        HtmlElement links = b.Document.GetElementById("btn1");
        links.InvokeMember("click");
        checkTrafiicButtonClick = true;
        MessageBox.Show("");
        ***// upto these working and loading second page after that i want to fill data   
           and want to submit but down line is not working and it should be work after    
           loading the page that i submitted how can i do these***

        HtmlElement tfrno = b.Document.GetElementById("TrfNo");
        tfrno.SetAttribute("value", "50012079");
        HtmlElement submitButon = b.Document.GetElementById("submitBttn");
        submitButon.InvokeMember("click");

    }
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1 回答 1

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根据您的评论，您的代码将无法按预期工作。第一次单击后，网络浏览器开始异步页面加载。您应该执行以下操作：

private void b_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
    {
        WebBrowser b = sender as WebBrowser;
     if(b.Url.AbsoluteUri == "mydomain.com/page1.html")
     {
        string response = "";
        response = b.DocumentText;
        HtmlElement links = b.Document.GetElementById("btn1");
        links.InvokeMember("click");
        checkTrafiicButtonClick = true;
        MessageBox.Show("");
        return;
     }
        ***// upto these working and loading second page after that i want to fill data   
           and want to submit but down line is not working and it should be work after    
           loading the page that i submitted how can i do these***
     if(b.Url.AbsoluteUri == "mydomain.com//page2.htm")
     {
        HtmlElement tfrno = b.Document.GetElementById("TrfNo");
        tfrno.SetAttribute("value", "50012079");
        HtmlElement submitButon = b.Document.GetElementById("submitBttn");
        submitButon.InvokeMember("click");
        return;
     }
    }

另请注意，页面的某些部分可以从不同的来源加载，例如在 中iframe，因此您必须检查正确uri

于 2013-02-13T12:35:28.807 回答