XDocument.Descendants无法区分父子Member元素，如何查询并提取子元素？

原始XML文档 #

<?xml version="1.0" encoding="utf-8"?>
<Document>
    <Interface>
        <Sections xmlns="http://www.siemens.com/automation/Openness/SW/Interface/v4">
            <Section Name="Static">
                <Member Name="3bool1" Datatype="&quot;3bool&quot;" Remanence="NonRetain" Accessibility="Public">
                    <AttributeList>
                        <BooleanAttribute Name="ExternalAccessible" SystemDefined="true">true</BooleanAttribute>
                        <BooleanAttribute Name="ExternalVisible" SystemDefined="true">true</BooleanAttribute>
                        <BooleanAttribute Name="ExternalWritable" SystemDefined="true">true</BooleanAttribute>
                        <BooleanAttribute Name="SetPoint" SystemDefined="true">false</BooleanAttribute>
                    </AttributeList>
                    <Sections>
                        <Section Name="None">
                            <Member Name="bool1" Datatype="Bool" />
                            <Member Name="bool2" Datatype="Bool" />
                            <Member Name="bool3" Datatype="Bool" />
                        </Section>
                    </Sections>
                </Member>
                <Member Name="int7" Datatype="Int" Remanence="NonRetain" Accessibility="Public">
                    <AttributeList>
                        <BooleanAttribute Name="ExternalAccessible" SystemDefined="true">true</BooleanAttribute>
                        <BooleanAttribute Name="ExternalVisible" SystemDefined="true">true</BooleanAttribute>
                        <BooleanAttribute Name="ExternalWritable" SystemDefined="true">true</BooleanAttribute>
                        <BooleanAttribute Name="SetPoint" SystemDefined="true">true</BooleanAttribute>
                    </AttributeList>
                </Member>
            </Section>
        </Sections>
    </Interface>
 </Document>

原有参考代码（获取含Bool的Datatype属性） #

XNamespace ns = "http://www.siemens.com/automation/Openness/SW/Interface/v4";

var memb = doc.Descendants(ns + "Member")
     .Select(f => f.Attribute("Datatype"))
     .Where(n => n.Value.Contains("Bool"))
     .ToList();

memb.ForEach(i => Console.WriteLine("{0}\t", i));

需求实现代码 #

1. 判断Member是否为复合数据类型（包含子Member） #

通过检查Member节点下是否存在Sections/Section/Member结构来判断是否为复合类型：

XNamespace ns = "http://www.siemens.com/automation/Openness/SW/Interface/v4";

// 获取Static节下的所有父级Member
var parentMembers = doc.Descendants(ns + "Section")
    .Where(s => s.Attribute("Name")?.Value == "Static")
    .Elements(ns + "Member");

// 遍历判断每个父Member是否含子元素
foreach (var parent in parentMembers)
{
    bool isComplexType = parent.Elements(ns + "Sections")
                               .Elements(ns + "Section")
                               .Elements(ns + "Member")
                               .Any();
    Console.WriteLine($"Member [{parent.Attribute("Name").Value}] 是复合类型: {isComplexType}");
}

2. 提取指定父元素的所有子Member #

以示例中Name="3bool1"的父元素为例，提取其子元素：

// 定位目标父Member
var targetParent = parentMembers.FirstOrDefault(p => p.Attribute("Name").Value == "3bool1");

if (targetParent != null)
{
    // 提取所有子Member
    var childMembers = targetParent.Elements(ns + "Sections")
                                   .Elements(ns + "Section")
                                   .Elements(ns + "Member")
                                   .ToList();

    Console.WriteLine("\n目标父元素的子元素列表：");
    foreach (var child in childMembers)
    {
        Console.WriteLine($"Name: {child.Attribute("Name").Value}, Datatype: {child.Attribute("Datatype").Value}");
    }
}

内容的提问来源于stack exchange，提问作者fabrizio scarpetta