Question

我想知道是否有一种方法可以检查XML文件中有多少相等的字符串。例如，这是XML文件：

<Root>
  <task>
    <sub1>test</sub1>
    <sub2>hello</sub2>
    <sub3>csharp</sub3>
  </task>
  <task>
    <sub1>test2</sub1>
    <sub2>hello2</sub2>
    <sub3>csharp2</sub3>
  </task>
  <task>
    <sub1>test3</sub1>
    <sub2>hello3</sub2>
    <sub3>csharp3</sub3>
  </task>
  <task>
    <sub1>test</sub1>
    <sub2>hello4</sub2>
    <sub3>csharp4</sub3>
  </task>
</Root>

正如您所见，node.Innertext = "test"存在两次。我想知道我怎么算这个？我试过像

这样的东西

client["sub1"].InnerText.Count

但这会计算此字符串中的字符数。

建议赞赏：）

编辑：我使用XmlDocument

解析XML文件

Answer 1

选择要检查的元素（例如，所有任务的所有子元素）并按值对其进行分组：

xdoc.Root.Elements("task").SelectMany(t => t.Elements())
    .GroupBy(e => e.Value)
    .Select(g => new { Text = g.Key, Count = g.Count() })

查询语法：

var xdoc = XDocument.Load(path_to_xml);
var result = from t in xdoc.Root.Elements("task")
             from e in t.Elements()
             group e by e.Value into g
             select new {
                  Text = g.Key,
                  Count = g.Count()
             };

使用XPath：

var result = from e in xdoc.XPathSelectElements("//task/*")
             group e by e.Value into g
             select new {
                 Text = g.Key,
                 Count = g.Count()
             };

对于您的样本，xml结果将为：

[
  { Text: "test", Count: 2 },
  { Text: "hello", Count: 1 },
  { Text: "csharp", Count: 1 },
  { Text: "test2", Count: 1 },
  { Text: "hello2", Count: 1 },
  { Text: "csharp2", Count: 1 },
  { Text: "test3", Count: 1 },
  { Text: "hello3", Count: 1 },
  { Text: "csharp3", Count: 1 },
  { Text: "hello4", Count: 1 },
  { Text: "csharp4", Count: 1 }
]

如果您只想获得多次出现的文字，可以按计数过滤结果：

 result.Where(x => x.Count > 1)

XmlDocument的相同查询：

var doc = new XmlDocument();
doc.Load(path_to_xml);
var result = from XmlNode n in doc.SelectNodes("//task/*")
             group n by n.InnerText into g
             select new {
                 Text = g.Key,
                 Count = g.Count()
             };

Answer 2

var dubs = XDocument.Parse(xml)
            .Descendants("task")
            .GroupBy(g => (string)g.Attribute("sub1"))
            .Where(g => g.Count() > 1)
            .Select(g => g.Key);

计算XML文件中有多少相等的字符串

2 个答案: