[英]Selecting elements from XML file using LINQ
我有這個XML結構:
<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2">
<Document>
<name>My Work</name>
<Placemark>
<name>Main Building</name>
<Polygon>
<extrude>1</extrude>
<altitudeMode>relativeToGround</altitudeMode>
<outerBoundaryIs>
<LinearRing>
<coordinates>
</coordinates>
</LinearRing>
</outerBoundaryIs>
</Polygon>
</Placemark>
<Placemark>
<name>Office 1</name>
<Polygon>
<extrude>1</extrude>
<altitudeMode>relativeToGround</altitudeMode>
<outerBoundaryIs>
<LinearRing>
<coordinates>
</coordinates>
</LinearRing>
</outerBoundaryIs>
</Polygon>
</Placemark>
</Document>
</kml>
這繼續......
我需要為它們中的每一個選擇構建“名稱”並將其存儲在列表中。 我寫了這段代碼:
using System;
using System.Linq;
using System.Xml;
using System.Xml.Linq;
using System.Collections.Generic;
namespace dsdsdsds
{
public class Building
{
public string BuildingName { get; set; }
}
class MainClass
{
public static void Main(string[] args)
{
List<Building> buildingNames =
(from e in XDocument.Load("buildings.kml").Root
.Elements("Document")
select new Building
{
BuildingName = (string)e.Element("name")
}).ToList();
foreach (var e in buildingNames)
{
Console.WriteLine(e);
}
}
}
}
但是,它似乎不想輸出任何東西,我無法找出我出錯的地方。 誰能幫助我?
謝謝
您忘記了xml中聲明的命名空間:
var xdoc = XDocument.Load("buildings.kml");
XNamespace kml = "http://www.opengis.net/kml/2.2";
var buildings = xdoc.Root.Elements(kml + "Document")
.Select(d => new Building {
BuildingName = (string)d.Element(kml + "name")
}).ToList();
XDocument xDocument = XDocument.Load("buildings.kml");
XNamespace xNameSpace = "http://www.opengis.net/kml/2.2";
var names = from o in xDocument.Descendants(xNameSpace+"name")
select o.Value;
我認為這是最簡單的方法; 不要忘記在查詢元素之前添加命名空間。
從我所看到的,你試圖循環“文檔” - 元素並選擇他們的名字。 相反,你可能想要更進一步,進入地標 - 元素,即。
XDocument.Load("buildings.kml").Element("Document").Elements("Placemark")
select new Building
{
BuildingName = e.Element("name").Value
}).ToList();
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