如何根据另一个属性的值 select XML 中的一个属性?

How to select an attribute in XML based on the value of another attribute?

目前我能够 select 文档中的属性,因为它们是唯一可识别的,如下所示:

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;

但是我如何 select 来自同名节点 (yweather:forecast) 的 "text" 属性?

<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"/>

是否有条件语句我可以仅用于 select text 属性,其中 day 属性等于 "Mon"?

像这样的东西会起作用:

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);

你也可以参考这个