WebBrowser控件更改属性

时间:2013-10-08 17:53:56

标签: c# winforms webbrowser-control html-rendering

WebBrowser Control似乎在设置webBrowser1.DocumentText时重新排列HTML标记中的属性..

我想知道我是否缺少某种渲染模式或文档编码。只需将RichTextBoxControl(txt_htmlBody)和WebBrowser控件(webBrowser1)添加到Windows窗体中即可看出我的问题。

添加webBrowser1 WebBrowser控件,并添加一个事件处理程序; webBrowser1_DocumentCompleted

我用它将鼠标点击事件添加到网络浏览器控件。

  private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
    {
        // Attach an event to handle mouse clicks on the web browser
        this.webBrowser1.Document.Body.MouseDown += new HtmlElementEventHandler(Body_MouseDown);
    }

在鼠标点击事件中,我们会像这样点击哪个元素;

   private void Body_MouseDown(Object sender, HtmlElementEventArgs e)
    {
        // Get the clicked HTML element
        HtmlElement elem = webBrowser1.Document.GetElementFromPoint(e.ClientMousePosition);

        if (elem != null)
        {
            highLightElement(elem);

        }
    }

    private void highLightElement(HtmlElement elem)
    {

        int len = this.txt_htmlBody.TextLength;
        int index = 0;

        string textToSearch = this.txt_htmlBody.Text.ToLower(); // convert everything in the text box to lower so we know we dont have a case sensitive issues
        string textToFind = elem.OuterHtml.ToLower();
        int lastIndex = textToSearch.LastIndexOf(textToFind); 
        // We cant find the text, because webbrowser control has re-arranged attributes in the <img> tag
        // Whats rendered by web browser: "<img border=0 alt=\"\" src=\"images/promo-green2_01_04.jpg\" width=393 height=30>"
        // What was passed to web browser from textbox: <img src="images/PROMO-GREEN2_01_04.jpg" width="393" height="30" border="0" alt=""/>
        // As you can see, I will never be able to find my data in the source because the webBrowser has changed it

    }

txt_htmlBody RichTextBox添加到表单,并设置RichTextBox事件的TextChanged,以便将WebBrowser1.DocumentText(txt_htmlBody)文本更改为RichTextBox

   private void txt_htmlBody_TextChanged(object sender, EventArgs e)
    {
        try
        {

            webBrowser1.DocumentText = txt_htmlBody.Text.Replace("\n", String.Empty);

        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

运行程序时,将以下示例HTML复制到txt_htmlBody,然后单击右侧的图像并调试highLightElement。您将在我的评论中看到为什么我在搜索字符串中找不到指定的文本,因为WebBrowser控件会重新排列属性。

<img src="images/PROMO-GREEN2_01_04.jpg" width="393" height="30" border="0" alt=""/>

有谁知道如何让WebBrowser控件按原样呈现我的HTML?

感谢您的时间。

1 个答案:

答案 0 :(得分:1)

当您通过element.OuterHtml获取时,您不能指望已处理的HTML与原始来源的1:1相同。无论渲染模式如何,它几乎都不会相同。

然而,尽管属性可能已经重新排列,但它们的名称和值仍然相同,因此您只需要改进搜索逻辑(例如,通过遍历DOM三或简单地通过{{3}枚举元素并通过HtmlDocument.All检查其属性。