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我正在开展一个项目，以从我们的交付数据库中生成一些 KML 数据。

我很高兴使用 LINQ 构建 KML 结构，但似乎当命名空间属性应用于节点时，我无法将数据输出到字符串。

这是我用来生成 KML 的代码：

// Create a new XDocument object
_xDoc = new XDocument(new XDeclaration("1.0", "UTF-8", "yes"));

// Build internal kml document node
XElement document = CreateKmlDocumentNode();

if (document != null)
{
    // Add data points to the kml document node
    foreach (KmlData delivery in _deliveryData)
    {
        document.Add( CreatePlacemark(delivery) );
    }
}

// Add the document node to the kml node
XElement kml = new XElement("kml",
                            document);

// ** Comment out this line and the output is generated **
kml.Add( new XAttribute("xmlns", @"http://earth.google.com/kml/2.2"));

// And finally add the kml node to the XDocument
_xDoc.Add( kml );

这是我用来生成字符串的代码：

string output;

using (var stringWriter = new StringWriter())
{
    XmlWriterSettings xws = new XmlWriterSettings();
    xws.NamespaceHandling = NamespaceHandling.OmitDuplicates;
    xws.Indent = true;

    using (var xmlTextWriter = XmlWriter.Create(stringWriter, xws))
    {
        // The Line below throws the exception when the namespace attribute is added
        _xDoc.WriteTo(xmlTextWriter);

        xmlTextWriter.Flush();
        output = stringWriter.GetStringBuilder().ToString();
    }
}
return output;

生成的异常文本：

{“前缀 '' 不能在同一个起始元素标记中从 '' 重新定义为 'http://earth.google.com/kml/2.2'。”}

这是我希望数据看起来像的示例：

<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://earth.google.com/kml/2.2">
  <Document>
    <name>Sample</name>
    <description><![CDATA[]]></description>

    <Style id="depot">
      <IconStyle>
        <Icon>
          <href>http://maps.gstatic.com/mapfiles/ms2/micons/rangerstation.png</href>
        </Icon>
      </IconStyle>
    </Style>
    <Style id="pickupIcon">
      <IconStyle>
        <Icon>
          <href>http://maps.gstatic.com/mapfiles/ms2/micons/truck.png</href>
        </Icon>
      </IconStyle>
    </Style>
    <Style id="letterIcon">
      <IconStyle>
        <Icon>
          <href>http://maps.gstatic.com/mapfiles/ms2/micons/postoffice-us.png</href>
        </Icon>
      </IconStyle>
    </Style>
    <Placemark>
      <name>Chester Depot</name>
      <description><![CDATA[]]></description>
      <styleUrl>#depot</styleUrl>
      <Point>
        <coordinates>-2.881701,53.197021,0.000000</coordinates>
      </Point>
    </Placemark>
    <Placemark>
      <name>15 Hankelow Close</name>
      <description><![CDATA[<div><b><font size="4">Delivery Successful - 10:14am</font></b></div><div style="font-size:10pt"><b>Contact </b>Sam Spade</div><b style="font-size:10pt">Address </b><font size="2">15 Hankelow Close, Chester, Cheshire West and Chester CH2 2DZ, UK]]></description>
      <styleUrl>#letterIcon</styleUrl>
      <Point>
        <coordinates>-2.889466,53.199226,0.000000</coordinates>
      </Point>
    </Placemark>
    <Placemark>
      <name>45 Victoria Rd</name>
      <description><![CDATA[<div><b><font size="4">Pickup Successful - 1:24pm</font></b></div><div style="font-size:10pt"><b>Contact </b>Sam Spade</div><b style="font-size:10pt">Address </b><font size="2">Chester, Cheshire West and Chester CH2 2AX, UK]]></description>
      <styleUrl>#pickupIcon</styleUrl>
      <Point>
        <coordinates>-2.892855,53.198498,0.000000</coordinates>
      </Point>
    </Placemark>
  </Document>
</kml>
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1 回答 1

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我通过使用SharpKML库而不是从头开始构建 KML 解决了这个问题。

于 2012-05-20T08:48:41.237 回答