相关疑难解决方法(0)

在开始写这个问题之前,我试图解决以下问题

// 1. navigate to page
// 2. wait until page is downloaded
// 3. read and write some data from/to iframe 
// 4. submit (post) form

问题是,如果网页上存在iframe,则DocumentCompleted事件将被触发多次(在每个文档完成之后).程序很可能试图从DOM中读取未完成且自然失败的数据.

但突然写下这个问题'如果'怪物启发了我,我解决了问题,我试图解决.由于我没有谷歌这个,我觉得在这里发布它会很好.

    private int iframe_counter = 1; // needs to be 1, to pass DCF test
    public bool isLazyMan = default(bool);

    /// <summary>
    /// LOCK to stop inspecting DOM before DCF
    /// </summary>
    public void waitPolice() {
        while (isLazyMan) Application.DoEvents();
    }

    private void webBrowser1_Navigating(object sender, WebBrowserNavigatingEventArgs e) {
        if(!e.TargetFrameName.Equals(""))
            iframe_counter --; …

首先,由于我缺乏技术知识和可能的错误沟通而道歉,我对C#来说是一个新手.

我接管了一个项目,它抓取了一些网页并将它们保存为.png文件.

private void CaptureWebPage(string URL, string filePath, ImageFormat format)
{
    System.Windows.Forms.WebBrowser web = new System.Windows.Forms.WebBrowser();
    web.ScrollBarsEnabled = false; 
    web.ScriptErrorsSuppressed = true; 
    web.Navigate(URL); 

    while (web.ReadyState != System.Windows.Forms.WebBrowserReadyState.Complete)
        System.Windows.Forms.Application.DoEvents();
    System.Threading.Thread.Sleep(5000);

    int width = web.Document.Body.ScrollRectangle.Width;
    width += width / 10;
    width = width <= 300 ? 600 : width; 


    int height = web.Document.Body.ScrollRectangle.Height;
    height += height / 10;

    web.Width = width;
    web.Height = height;

    _bmp = new System.Drawing.Bitmap(width, height);


    web.DrawToBitmap(_bmp, new System.Drawing.Rectangle(0, 0, width, height));
    _bmp.Save(filePath, format);

    _bmp.Dispose();

}

但是,某些页面(只有少数几个)导致进程挂起.它不是所有的时间,而是经常.我发现问题似乎出现在以下代码部分:

while (web.ReadyState …