如何基于另一个属性的值选择XML中的属性? [英] How to select an attribute in XML based on the value of another attribute?

问题描述

当前，我能够在XML文档中选择属性，因为它们是唯一可识别的，如下所示:

Currently I am able to select attributes in an XML document because they are uniquely identifiable, like this:

XmlDocument weatherData = new XmlDocument();
weatherData.Load(query);

XmlNode channel = weatherData.SelectSingleNode("rss").SelectSingleNode("channel");
XmlNamespaceManager man = new XmlNamespaceManager(weatherData.NameTable);
man.AddNamespace("yweather", "http://xml.weather.yahoo.com/ns/rss/1.0");

town            = channel.SelectSingleNode("yweather:location", man).Attributes["city"].Value;

但是如何从同名的节点(yweather:forecast)中选择文本"属性?

But how do I select the "text" attribute from a node of the same name (yweather:forecast)?

<yweather:forecast day="Sat" text="Sunny" code="32"/>
<yweather:forecast day="Sun" text="Partly Cloudy" code="30"/>
<yweather:forecast day="Mon" text="AM Showers" code="39"/>
<yweather:forecast day="Tue" text="Cloudy" code="26"/>
<yweather:forecast day="Wed" text="Cloudy/Wind" code="24"/>

是否有一条条件语句只能用于选择text属性(其中day属性等于"Mon")?

Is there a conditional statement I can use to only select the text attribute where the day attribute is equal to "Mon"?

推荐答案

类似的方法将起作用:

string xml = "YourXml";
XElement doc = XElement.Parse(xml);

var Result = from a in doc.Descendants("yweather:forecast")
             where a.Attribute("day").Value == "Mon"
             select a.Attribute("text").Value;

或lambda语法:

var Result = doc.Descendants("yweather:forecast")
                .Where(x=> x.Attribute("day").Value == "Mon")
                .Select(x=> x.Attribute("text").Value);

您还可以参考此 SO帖子

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