Question

我可以使用此代码

阅读并获取KML数据Placemark值

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Xml.Linq;

namespace ConsoleApplication1
{
    class Program
    {
        const string FILENAME = @"c:\temp\test.xml";
        static void Main(string[] args)
        {
            XDocument doc = XDocument.Load(FILENAME);
            List<XElement> placemarks = doc.Descendants().Where(x => x.Name.LocalName == "Placemark").ToList();
            List<string> states = placemarks.Descendants().Where(x => x.Name.LocalName == "name").Select(x => x.Value).ToList();
        }
    }

}

但如果它有以下详细信息，我不知道如何获取KML数据：

示例：阿拉巴马州KML格式，如

<Polygon> <outerBoundaryIs> <LinearRing> <coordinates>-85.070067,31.980703,0.0 -85.11515,31.907425,0.0 -85.135567,31.854884,0.0 -85.0567,32.017377,0.0 -85.070067,31.980703,0.0</coordinates> </LinearRing> </outerBoundaryIs> </Polygon>
示例：德克萨斯州KML格式，如

<MultiGeometry> <Polygon> <outerBoundaryIs> <LinearRing> <coordinates>-161.333785,58.703653</coordinates> </LinearRing> </outerBoundaryIs> </Polygon> <Polygon> <outerBoundaryIs> <LinearRing> <coordinates>-131.594177,55.106316,55.23548,0.0</coordinates> </LinearRing> </outerBoundaryIs> </Polygon> </MultiGeometry>

我尝试了这个LINQ过程来获取Polygon值：

List<string> states = placemarks.Descendants().Where(x => x.Name.LocalName == "Polygon").Select(x => x.Value).ToList();

输出：

-85.070067,31.980703,0.0 -85.11515,31.907425,0.0 -85.135567,31.854884,0.0 -85.0567,32.017377,0.0 -85.070067,31.980703,0.0

在我尝试用下面显示的格式替换坐标并将它们复制/粘贴到融合表位置预览中后，地图的工作方式完全符合预期。

<Polygon> <outerBoundaryIs> <LinearRing> <coordinates>-85.070067,31.980703,0.0 -85.11515,31.907425,0.0 -85.135567,31.854884,0.0 -85.0567,32.017377,0.0 -85.070067,31.980703,0.0</coordinates> </LinearRing> </outerBoundaryIs> </Polygon>

但是当我尝试使用相同的方式获得Multigeometry值时：

List<string> states = placemarks.Descendants().Where(x => x.Name.LocalName == "MultiGeometry").Select(x => x.Value).ToList();

我得到了这个输出：

-161.333785,58.703653 -131.594177,55.106316,55.23548,0.0

但我不知道如何获取细节。

Answer 1

＆＃34; 在我尝试用下面显示的格式替换坐标并将它们复制/粘贴到融合表位置预览后，地图的工作方式完全符合预期。＆＃34;

<Polygon> <outerBoundaryIs> <LinearRing> <coordinates>-85.070067,31.980703,0.0 -85.11515,31.907425,0.0 -85.135567,31.854884,0.0 -85.0567,32.017377,0.0 -85.070067,31.980703,0.0</coordinates> </LinearRing> </outerBoundaryIs> </Polygon>

如果您想要XElement的XML标记，只需调用ToString()而不是获取Value属性：

List<string> states = placemarks.Descendants()
                                .Where(x => x.Name.LocalName == "MultiGeometry")
                                .Select(x => x.ToString())
                                .ToList();

..或者如果你真的打算从MultiGeometry得到个别坐标值：

List<string> states = placemarks.Descendants()
                                .Where(x => x.Name.LocalName == "MultiGeometry")
                                .Descendants()
                                .Where(x => x.Name.LocalName == "Polygon")
                                .Select(x => x.Value)
                                .ToList();

如何在c＃中获取KML Polygon和Multigeometry值？

1 个答案: