Question

请参阅我的演示。我想删除所有重复的地标节点，而不管层次结构如何。这对Linq有可能吗？删除所有重复节点并保存为新的xml文件的最佳方法是什么。

另请注意，对于演示，我创建了一个字符串，否则我将从计算机路径加载xml文件。

更新

    var raw = @"<?xml version='1.0' encoding='UTF-8'?><kml xmlns= 'http://www.opengis.net/kml/2.2'>
      <Document>
          <Folder>
  <Placemark>
    <name>1</name>
    <description>abc</description>
    <Point>
      <coordinates>102.595626,14.996729</coordinates>
    </Point>
  </Placemark>
  <Placemark>
    <name>2</name>
    <description>abc</description>
    <Point>
      <coordinates>102.595626,14.996729</coordinates>
    </Point>
  </Placemark>
  <Placemark>
    <name>2</name>
    <description>abc</description>
    <Point>
      <coordinates>102.595626,14.996729</coordinates>
    </Point>
  </Placemark>
  <Placemark>
    <name>4</name>
    <description>abc</description>
    <Point>
      <coordinates>102.595626,14.996729</coordinates>
    </Point>
  </Placemark>

   <Folder>
          <Placemark>
            <name>3</name>
            <description>abc</description>
            <Point>
              <coordinates>102.595626,14.996729</coordinates>
            </Point>
          </Placemark>
          <Placemark>
            <name>4</name>
            <description>abc</description>
            <Point>
              <coordinates>102.595626,14.996729</coordinates>
            </Point>
          </Placemark>
          <Placemark>
            <name>4</name>
            <description>abc</description>
            <Point>
              <coordinates>102.595626,14.996729</coordinates>
            </Point>
          </Placemark>
</Folder>
</Folder> 
<Placemark>
  <name>4</name>
  <description>abc</description>
  <Point>
    <coordinates>102.595626,14.996729</coordinates>
  </Point>
</Placemark>

<Placemark>
  <name>4</name>
  <description>abc</description>
  <Point>
    <coordinates>102.595626,14.996729</coordinates>
  </Point>
</Placemark>
      </Document>
    </kml>";

代码

    var xdoc = XDocument.Parse(raw);
    XNamespace ns = "http://www.opengis.net/kml/2.2";
    xdoc.Root.Elements(ns+"Document").Elements(ns+"Placemark").GroupBy(i => (string)i).SelectMany(g => g.Skip(1)).Remove();

我想查找所有Placemark节点，并删除重复的节点，而不考虑层次结构

Answer 1

您可以通过将地标节点的值连接到字典来实现如果您在字典中找到节点的值，则它是重复的，您可以在其上调用.Remove() 一种方法：

var raw = "yourxmlhere";
var xdoc = XDocument.Parse(raw);
XNamespace ns = "http://www.opengis.net/kml/2.2";

Dictionary<string,bool> dictionary = new Dictionary<string,bool>();
var descendants = xdoc.Root.Descendants(ns + "Placemark").ToList();

foreach(var node in descendants){
    string key = string.Join("", node.Elements().Select(el => el.Value));
    if(dictionary.ContainsKey(key))
        node.Remove();
    else
        dictionary.Add(key, true);
}
//at this point your xdoc only contains unique Placemark nodes

c＃从xml文件中删除节点，而不考虑层次结构

1 个答案: