Question

此XML文件是使用Wikipedia API？

获得的

<SearchSuggestion version="2.0" xmlns="http://opensearch.org/searchsuggest2">
    <Query xml:space="preserve">India</Query>
    <Section>
        <Item>
            <Image source="http://upload.wikimedia.org/wikipedia/en/thumb/4/41/Flag_of_India.svg/50px-Flag_of_India.svg.png" width="50" height="33" />
            <Text xml:space="preserve">India</Text>
            <Description xml:space="preserve">India (), officially the Republic of India ('), is a country in South Asia. It is the seventh-largest country by area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world. </Description>
            <Url xml:space="preserve">http://en.wikipedia.org/wiki/India</Url>
        </Item>
    </Section>
</SearchSuggestion>

我试过这个：

var texts = doc.Descendants("Text");
foreach (var text in texts)
{
    Debug.WriteLine(text.Value);
}

但是我遇到了Object reference not set to an instance of an object.错误。然后我尝试了这个：

XNamespace aw = "https://www.google.org";
IEnumerable<XElement> de =  from el in doc.Descendants(aw + "Text")
                            select el;
foreach (XElement el in de)
    Console.WriteLine(el.Name);

但是这段代码给了我一个System.NullReferenceException;Object reference not set to an instance of an object.错误。

Answer 1

您的命名空间错误。使用LINQ2XML，您可以使用默认文档命名空间，然后按照标记名称Text提取节点：

var xml = XDocument.Parse(xmlSource); // or XDocument.Load("c:\path\input.xml");
var ns = xml.Root.GetDefaultNamespace();
var textNodes = xml.Root.Descendants(ns + "Text").ToList();
foreach (var textNode in textNodes)
{
    Console.WriteLine(textNode.Value);
}

这种情况下的输出是：

印度

如何从XML标签获取数据

1 个答案: