我的 LINQ2XML 查询已实现我的目标一半:
var XMLDoc = XDocument.Load("WeatherData.xml");
var maximums = from tempvalue in
XMLDoc.Descendants("temperature").Elements("value")
where tempvalue.Parent.Attribute("type").Value == "maximum"
select (string)tempvalue;
var minimums = from tempvalue in
XMLDoc.Descendants("temperature").Elements("value")
where tempvalue.Parent.Attribute("type").Value == "minimum"
select (string)tempvalue;
List<string> MaxTemps = maximums.ToList();
List<string> MinTemps = minimums.ToList();
但是,我在从 XML 文档获取时间信息时遇到了麻烦,因为我必须匹配布局键信息(请参阅 XML 注释),并且我想知道 LINQ 中的最佳解决方案是什么将此时间数据与我现有的查询结合起来:
(顺便说一句,此 XML 数据来自 Web 服务)
<?xml version="1.0" encoding="utf-8"?>
<dwml>
<data>
<time-layout>
<!-- Maximums Key -->
<layout-key>k-p24h-n7-1</layout-key>
<start-valid-time>2009-02-09T07:00:00-05:00</start-valid-time>
<end-valid-time>2009-02-09T19:00:00-05:00</end-valid-time>
<start-valid-time>2009-02-10T07:00:00-05:00</start-valid-time>
<end-valid-time>2009-02-10T19:00:00-05:00</end-valid-time>
<start-valid-time>2009-02-11T07:00:00-05:00</start-valid-time>
<end-valid-time>2009-02-11T19:00:00-05:00</end-valid-time>
<start-valid-time>2009-02-12T07:00:00-05:00</start-valid-time>
<end-valid-time>2009-02-12T19:00:00-05:00</end-valid-time>
<start-valid-time>2009-02-13T07:00:00-05:00</start-valid-time>
<end-valid-time>2009-02-13T19:00:00-05:00</end-valid-time>
<start-valid-time>2009-02-14T07:00:00-05:00</start-valid-time>
<end-valid-time>2009-02-14T19:00:00-05:00</end-valid-time>
<start-valid-time>2009-02-15T07:00:00-05:00</start-valid-time>
<end-valid-time>2009-02-15T19:00:00-05:00</end-valid-time>
</time-layout>
<time-layout>
<!-- Minimums Key -->
<layout-key>k-p24h-n7-2</layout-key>
<start-valid-time>2009-02-08T19:00:00-05:00</start-valid-time>
<end-valid-time>2009-02-09T08:00:00-05:00</end-valid-time>
<start-valid-time>2009-02-09T19:00:00-05:00</start-valid-time>
<end-valid-time>2009-02-10T08:00:00-05:00</end-valid-time>
<start-valid-time>2009-02-10T19:00:00-05:00</start-valid-time>
<end-valid-time>2009-02-11T08:00:00-05:00</end-valid-time>
<start-valid-time>2009-02-11T19:00:00-05:00</start-valid-time>
<end-valid-time>2009-02-12T08:00:00-05:00</end-valid-time>
<start-valid-time>2009-02-12T19:00:00-05:00</start-valid-time>
<end-valid-time>2009-02-13T08:00:00-05:00</end-valid-time>
<start-valid-time>2009-02-13T19:00:00-05:00</start-valid-time>
<end-valid-time>2009-02-14T08:00:00-05:00</end-valid-time>
<start-valid-time>2009-02-14T19:00:00-05:00</start-valid-time>
<end-valid-time>2009-02-15T08:00:00-05:00</end-valid-time>
</time-layout>
<parameters>
<!-- 1st Key -->
<temperature type="maximum" time-layout="k-p24h-n7-1">
<value>44</value>
<value>57</value>
<value>55</value>
<value>40</value>
<value>39</value>
<value>34</value>
<value>33</value>
</temperature>
<!-- 2nd Key -->
<temperature type="minimum" time-layout="k-p24h-n7-2">
<value>24</value>
<value>38</value>
<value>46</value>
<value>35</value>
<value>25</value>
<value>27</value>
<value>23</value>
</temperature>
</parameters>
</data>
</dwml>
最佳答案
我首先会将其分解为更小的部分。首先,我会将时间布局调整为更可行的形式,按布局键分组,并将有效开始时间和有效结束时间相互关联:
var timeLayouts =
from tempvalue in XMLDoc.Descendants("time-layout")
let tempStartTimes = tempvalue.Elements("start-valid-time").
Select((x, i) => new { Index = i, ValidDateTime = (DateTime)x })
let tempEndTimes = tempvalue.Elements("end-valid-time").
Select((x, i) => new { Index = i, ValidDateTime = (DateTime)x })
select new
{
LayoutKey = tempvalue.Element("layout-key").Value,
ValidTimeRanges =
from s in tempStartTimes
from e in tempEndTimes
where s.Index == e.Index
select new
{
Index = s.Index,
ValidStartDateTime = s.ValidDateTime,
ValidEndDateTime = e.ValidDateTime
}
};
然后,我会以大致相同的方式调整参数:
var parameters =
from tempvalue in XMLDoc.Descendants("temperature")
select new
{
TemperatureType = (string) tempvalue.Attribute("type"),
TimeLayout = (string) tempvalue.Attribute("time-layout"),
Temperatures = tempvalue.Elements("value").Select((x, i) =>
new { Index = i, Temperature = (int)x })
};
从那里,获得最大值和最小值并不难:
var maximums =
from p in parameters
where p.TemperatureType == "maximum"
from tl in timeLayouts
where tl.LayoutKey == p.TimeLayout
from tr in tl.ValidTimeRanges
from t in p.Temperatures
where tr.Index == t.Index
select new { tr.ValidStartDateTime, tr.ValidEndDateTime,
t.Temperature };
var minimums =
from p in parameters
where p.TemperatureType == "minimum"
from tl in timeLayouts
where tl.LayoutKey == p.TimeLayout
from tr in tl.ValidTimeRanges
from t in p.Temperatures
where tr.Index == t.Index
select new { tr.ValidStartDateTime, tr.ValidEndDateTime,
t.Temperature };
如果您想简化某些表示(例如,您可以将布局和参数展平为更“表格”的内容),您可以采用其他方法,只需要进行一些调整即可。
关于c# - 在这种情况下我将如何使用 LINQ2XML?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/542426/