c# - 在 C# 中使用 xdocument 从 xml 文件中提取特定数据

Question

我正在尝试从我的 xml 文件中获取相关数据。因此，例如，我希望从 venue 元素中选择名为 Roker Park 的元素中的所有数据。我如何只选择该数据而不选择其余数据？这是我的 xdocument

<Funrun>
    <Venue> 
        <Name>Roker Park</Name>
        <Runner> 
            <Charity>Cancer Research</Charity>
            <Firstname>Roger</Firstname>
            <Lastname>Malibu</Lastname>
            <Sponsorship>550</Sponsorship>
        </Runner>
        <Runner>
            <Charity>Arthritis UK</Charity>
            <Firstname>Adam</Firstname>
            <Lastname>White</Lastname>
            <Sponsorship>340</Sponsorship>
        </Runner>
        <Venue> 
            <Name>Victoria Park</Name>
            <Runner> 
                <Charity>Against Malaria Foundation</Charity>
                <Firstname>Rob</Firstname>
                <Lastname>Tate</Lastname>
                <Sponsorship>850</Sponsorship>
            </Runner>
            <Runner>
                <Charity>Fred Follows Foundation</Charity>
                <Firstname>Peter</Firstname>
                <Lastname>Jackson</Lastname>
                <Sponsorship>500</Sponsorship>
            </Runner>
        </Venue>
</Funrun>

到目前为止我得到的代码选择了所有场馆数据，所以我得到了 Victoria Parks 和 Rokers，这是我到目前为止得到的代码:

List<string> VenueNames = new List<string>();
List<string> VenueDataList = new List<string>();

var doc = XDocument.Load("XMLFile1.xml");
var doc2 = XDocument.Load("XMLFile2.xml");
var doc3 = XDocument.Load("XMLFile3.xml");

var combinedunique = doc.Descendants("Venue")
                      .Union(doc2.Descendants("Venue"))
                      .Union(doc3.Descendants("Venue"));

foreach (XElement element in combinedunique.DescendantsAndSelf("Venue"))
{
    VenueNames.Add(element.Element("Name").Value.ToString());
}

if (Convert.ToString(lstboxVenues.SelectedItem) == VenueNames.ElementAt(0))
{
    foreach (XElement element in combinedunique.DescendantsAndSelf("Firstname"))   
    {
        VenueDataList.Add(element.Value);
    }

    for (int i = 0; i < VenueDataList.Count; i++)
    {
        lstboxVenueData.Items.Add(VenueDataList.ElementAt(i));
    }
}

Answer 1

获取所有 field 名称:

List<strgin> VenueNames = combindedunique.Select(v => (string)v.Element("Name")).ToList();

输出:

[
  "Roker Park",
  "Victoria Park"
]

通过给定的场所名称获取名字:

string venueName = "Victoria Park"; // name you want to search by
List<string> VenueDataList =
      combindedunique.Where(v => (string)v.Element("Name") == venueName)
                     .Elements("Runner")
                     .Select(r => (string)r.Element("Firstname"))
                     .ToList();

输出:

[
  "Rob",
  "Peter"
]