从跨度读取值
[英]Read Value from span
问题描述
i want to try a programm which reads out Values of a website with Geckofx. 
我想尝试一个使用Geckofx读取网站价值的程序。 Now i have the following Problem that i dont get the needed Values and it shows to me it is null. 现在我有以下问题，我没有获得所需的值，它向我显示它为空。
The HTML Code i want to access: 我要访问的HTML代码：
<li id="box" class="tooltip" title="">
<div class="classname"></div>
<span class="value">
<span id="class_test" class="">48.066</span>
</span>
</li>
48.066 is the Value i want to read. 48.066是我要读取的值。
I searched now for about 2 days for a solution that i can go on with my private project i hope anyone can help me :) 我现在搜寻了大约2天的解决方案，可以继续进行我的私人项目，希望有人可以帮助我:)
Solutions i tried: 我尝试的解决方案：
Test 1: 测试1：
GeckoElement testelement = null;
testelement = (GeckoElement)Browser.Document.GetElementById("class_test");
string text = testelement.GetAttribute("value");
Test 2: 测试2：
GeckoHtmlElement testelement = null;
testelement = (GeckoHtmlElement)Browser.Document.GetHtmlElementById("class_test");
string text = testelement.InnerHtml;
2 个解决方案
解决方案1
0 已采纳 2018-01-04 23:52:10
If testelement is null, you're not loading the page correctly, or the source is incorrect. 如果testelement为null，则说明您未正确加载页面，或者源不正确。
This works fine: 这工作正常：
string content = "<html><body><li id=\"box\" class=\"tooltip\" title=\"\">"+
"<div class=\"classname\"></div>" +
"<span class=\"value\">" +
"<span id=\"class_test\" class=\"\">48.066</span>" +
"</span></li></body></html>";
webBrowser1.LoadHtml(content, "http://www.example.com");
And in webBrowser_DocumentCompleted: 并在webBrowser_DocumentCompleted中：
GeckoElement testelement = null;
testelement = (GeckoElement)webBrowser1.Document.GetElementById("class_test");
string text = testelement.InnerHtml; // 48.066
解决方案2
0 2018-01-05 00:00:02
Most likely, you need to wait for the document to finish loading before looking for elements. 最有可能的是，您需要等待文档完成加载才能查找元素。
Browser.DocumentCompleted += (sender, e) =>
{
var testElement = Browser.Document.GetElementById("class_test") as GeckoElement;
// TODO: handle testElement being null
string text = testElement.GetAttribute("value");
}
声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.