c# - Linq XML 使用属性中的特定值查询父级的后代

Question

我需要一些 LINQ to XML 方面的帮助。我有以下 XML；

<GcctTestData>
  <TestDriveRequest Record="1">
    <element name="Time Zone">(GMT+05:30)</element>
    <element name="Requested Dealer">Concorde</element>
    <element name="Model Year">1999</element>
    <element name="Make">Tata</element>
    <element name="Model/Vehicle Line">Indica</element>
  </TestDriveRequest>
  <TestDriveRequest Record="2">
    <element name="Time Zone">(GMT+05:30)</element>
    <element name="Requested Dealer">Kun"</element>
    <element name="Model Year">2020"</element>
    <element name="Make">BMW"</element>
    <element name="Model/Vehicle Line">3-series</element>
  </TestDriveRequest>
  <TestDriveRequest Record="3">
    <element name="Time Zone">(GMT+05:30)</element>
    <element name="Requested Dealer">KUN Hyundai</element>
    <element name="Model Year">2001</element>
    <element name="Make">Hyundai</element>
    <element name="Model/Vehicle Line">Verna</element>
  </TestDriveRequest>
</GcctTestData>

我试过如下:

IEnumerable<XElement> xElements =
                from element in root.Elements("TestDriveRequest")
                where element.Attribute("Record").Value == "1"
                select element;

            foreach (XElement el in xElements.Descendants().Where(p => !p.HasElements))
            {
                int keyInt = 0;
                string keyName = el.Attribute("name").Value;

                while (keyValuePairs.ContainsKey(keyName))
                {
                    keyName = $"{el.Attribute("name").Value}_{keyInt++}";
                }
                keyValuePairs.Add(keyName, el.Value);
            }                

我必须得到元素 姓名 的属性值元素 对于具有记录值 的父级1

但是 linq 查询没有获取它......

在实现@anu-viswan 的建议后，我面临以下问题

Answer 1

您需要使用 root.Descendants而不是 root.Elements .

例如，

IEnumerable<XElement> xElements =   from element in root.Descendants("TestDriveRequest")
                where element.Attribute("Record").Value == "1"
                select element;

XContainer.Elements

Returns a filtered collection of the child elements of this element or document, in document order. Only elements that have a matching XName are included in the collection.

XContainer.Descendants

Returns a filtered collection of the descendant elements for this document or element, in document order. Only elements that have a matching XName are included in the collection Output

完整代码

IEnumerable<XElement> xElements =   from element in root.Descendants("TestDriveRequest")
            where element.Attribute("Record").Value == "1"
            select element;

foreach (XElement el in xElements.Descendants().Where(p => !p.HasElements))
{
   int keyInt = 0;
   string keyName = el.Attribute("name").Value;

   while (keyValuePairs.ContainsKey(keyName))
   {
     keyName = $"{el.Attribute("name").Value}_{keyInt++}";
   }
   keyValuePairs.Add(keyName, el.Value);
}  

样本输出