Question

LINQ2Xml：我想得到候选人在每个省赢得的元素数。我需要一些帮助。

<Pronvice_Data>
    <Pronvice>PronviceA</Pronvice>
    <Registered_Voters>115852</Registered_Voters>
    <Sam_Kea>100</Sam_Kea>
    <Jeje>500</Jeje>
    <John_Doe>400</John_Doe>
</Pronvice_Data>

<Pronvice_Data>
    <Pronvice>PronviceA</Pronvice>
    <Registered_Voters>25852</Registered_Voters>
    <Sam_Kea>200</Sam_Kea>
    <Jeje>100</Jeje>
    <John_Doe>300</John_Doe>
</Pronvice_Data>

<Pronvice_Data>
    <Pronvice>PronviceC</Pronvice>
    <Registered_Voters>317684</Registered_Voters>
    <Sam_Kea>1000</Sam_Kea>
    <Jeje>1200</Jeje>
    <John_Doe>190</John_Doe>
</Pronvice_Data>

预期结果：

Candidate | Won In
Jeje         2
John_Doe     1
Sam_Kea      0

Answer 1

好的，我不喜欢数据格式，所以我将其更改为：

<root>
  <Candidates>
    <Sam_Kea/>
    <Jeje/>
    <John_Doe/>
  </Candidates>

  <Provinces>
    <Province name='ProvinceA' Registered_Voters='115852'>
      <Candidate name='Sam_Kea' votes='100'/>
      <Candidate name='Jeje' votes='500'/>
      <Candidate name='John_Doe' votes='400'/>
    </Province>

    <Province name='ProvinceB' Registered_Voters='25852'>
      <Candidate name='Sam_Kea' votes='200'/>
      <Candidate name='Jeje' votes='100'/>
      <Candidate name='John_Doe' votes='300'/>
    </Province>

    <Province name='ProvinceC' Registered_Voters='317684'>
      <Candidate name='Sam_Kea' votes='1000'/>
      <Candidate name='Jeje' votes='1200'/>
      <Candidate name='John_Doe' votes='190'/>
    </Province>
  </Provinces>

</root>

这是我使用的LINQ-to-XML代码：

public void Run()
{
    string fileToLoad = this.GetType().Name + ".xml";

    XElement root = XElement.Load(fileToLoad);

    // =======================================================
    System.Console.WriteLine("\nCandidates:");
    var allCandidates = from c in root.Element("Candidates").Elements()
        select c.Name;

    foreach (var d in allCandidates)
        Console.WriteLine("  {0}", d.ToString());


    // =======================================================
    System.Console.WriteLine("\nNumber of Candidates in each Province:");

    var s1 = from p in root.Element("Provinces").Elements()
        select new
            {
                Prov = (string) p.Attribute("name"),
                NumCandidates = p.Elements("Candidate").Count()
            };

    foreach (var d in s1)
        Console.WriteLine("  {0}", d.ToString());


    // =======================================================
    System.Console.WriteLine("\nCandidate with most votes:");
    var s2 = from p in root.Element("Provinces").Elements()
        let maxVotes = (from c in p.Elements("Candidate") select c)
                       .Max(x => ((int)x.Attribute("votes")))

        select new
            {
                Prov = (string) p.Attribute("name"),
                Voters = (int) p.Attribute("Registered_Voters"),
                Candidate = (from c in p.Elements("Candidate")
                             select c).Where(x => ((int)x.Attribute("votes")) == maxVotes)
                    .First().Attribute("name").Value
            };

    foreach (var d in s2)
        Console.WriteLine("  {0}", d.ToString());


    // =======================================================
    System.Console.WriteLine("\nCandidates and the # of provinces won:");

    var s4 = from can in allCandidates
        let count = (from p in s2 where p.Candidate == can select p).Count()
        orderby count descending
        select new { Candidate = can, NumberOfProvincesWon = count };

    foreach (var d in s4)
        Console.WriteLine("  {0}", d.ToString());
}

输出：

Candidates:
  Sam_Kea
  Jeje
  John_Doe

Number of Candidates in each Province:
  { Prov = ProvinceA, NumCandidates = 3 }
  { Prov = ProvinceB, NumCandidates = 3 }
  { Prov = ProvinceC, NumCandidates = 3 }

Candidate with most votes:
  { Prov = ProvinceA, Voters = 115852, Candidate = Jeje }
  { Prov = ProvinceB, Voters = 25852, Candidate = John_Doe }
  { Prov = ProvinceC, Voters = 317684, Candidate = Jeje }

Candidates and the # of provinces won:
  { Candidate = Jeje, NumberOfProvincesWon = 2 }
  { Candidate = John_Doe, NumberOfProvincesWon = 1 }
  { Candidate = Sam_Kea, NumberOfProvincesWon = 0 }

Answer 2

我很难处理属性值。从原始格式，我会使用下面的代码得到它。

var Percentages= from elem in xmlVectors2.Descendants("Province_Data")
          where elem.Elements().Count() > 1
          group elem by new { groupedData = elem.Element("Province_Data")} into g
          let votesSam_Kea=g.Sum(elem =>(int)elem.Element("Sam_Kea"))
          let votesJeje=g.Sum(elem =>(int)elem.Element("Jeje"))
          let votesJohn_Doe= g.Sum(elem =>(int)elem.Element("John_Doe"))              
          let totVotesCast=votesSam_Kea+ votesJeje+ votesJohn_Doe
          select new {
             Percent_Sam_Kea= Math.Round((double)(votesSam_Kea*100)/totVotesCast,2),
             Percent_Jeje=Math.Round((double)(votesJeje*100)/totVotesCast,2),
             Percent_John_Doe=Math.Round((double)(votesJohn_Doe*100)/totVotesCast,2),                
             VotesCast= totVotesCast,
             RegisteredVoters = g.Sum(elem => (int)elem.Element("Registered_Voters"))
             };

获得候选人获胜的元素数

2 个答案: