我们使用了一个返回 XML 的第三方 Web 服务,它看起来像(为了简洁而删减):
<Response>
<block name="availability">
<block name="cqual">
<a name="result-code" format="text">L</a>
</block>
<block name="exchange">
<a name="code" format="text">MRDEN</a>
</block>
<block name="mqual">
<a name="rate-adaptive" format="text">G</a>
</block>
</block>
<block name="products">
<block>
<a name="product-id" format="counting">1235</a>
<block name="realms">
<block>
<a name="realm" format="text">-u@surfuk1</a>
</block>
</block>
</block>
<block>
<a name="product-id" format="counting">1236</a>
<block name="realms">
<block>
<a name="realm" format="text">-u@surfuk2</a>
</block>
</block>
</block>
<block>
<a name="product-id" format="counting">1237</a>
<block name="realms">
<block>
<a name="realm" format="text">-u@surfuk3</a>
</block>
</block>
</block>
</block>
<status no="0" />
</Response>
对于特定的产品代码,我需要获取realm
名称,即内部文本:
<a name="realm" format="text">
-u@surfuk2</a>
因为每个元素名称要么是要么<block>
用<a>
linq 解析为 xml 或查询表达式有点麻烦。
以下是获取特定产品的领域名称(例如 1235)的最有效/最有效/最具表现力的方式:
List<XElement> products = response
.Element("Response")
.Elements("block")
.Where(x => x.Attribute("name").Value == "products")
.Elements("block").ToList();
//
// I broke down the query to aid readability
//
string realm = products.Elements("a")
.Where(x => x.Attribute("name").Value == "product-id")
.Where(y => y.Value == "1235") // hardcoded for example use
.Ancestors()
.First()
.Elements("block")
.Where(z => z.Attribute("name").Value == "realms")
.Elements("block")
.Elements("a")
.First().Value;