Question

如何将此foreach循环更改为if语句。它显示每个图像的消息[即使我只点击一个]。我只想在点击图片时显示一条消息......

[代码]

 private void webBrowser1_DocumentCompleted(object sender, CompletedEventArgs e)
        {
            foreach (HtmlElement ele in
                     webBrowser1.Document.GetElementsByTagName("img"))
            {
                ele.AttachEventHandler("onclick", Document_Click);
            }
        }

 private void Document_Click(object sender, EventArgs e)
        {
                MessageBox.Show("You clicked an image.");
        }

[我试过的]

 if (webBrowser1.Document.GetType().GetElementType().Equals("img"))
 {
    // I tried this
 }

 HtmlElement elemz;
 if (elemz.GetAttribute("type").Equals("img"))   
 {
    // And this
 }

 HtmlElement elemz;
 if (elemz == webBrowser1.Document.GetElementsByTagName("img"))
 {
    // Also this
 }

 if (webBrowser1.Document.GetType("img") == true)
 {
    // Finally I tried this
 }

 HtmlElement elemz;
 if (elemz.GetAttribute("type") == webBrowser1.Document.GetElementsByTagName("img"))
 {
    // My last hope was this 
 }

Answer 1

并不是每个图片都会显示点击事件，因为DocumentCompleted事件多次触发。（见WebBrowser DocumentCompleted event fired more than once）。如果您检查e.Url以确保您只运行实际页面DocumentCompleted的代码，您将看到该事件仅触发一次。

    private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e) {
        if (e.Url.Equals(webBrowser1.Url)) {
            foreach (HtmlElement ele in webBrowser1.Document.GetElementsByTagName("img")) {

                ele.AttachEventHandler("onclick", Document_Click);
            }
        }
    }

如何在c语句中使用HtmlElement [webbrowser / winforms]在c＃中

1 个答案: