如何转换XDocument,只留下选定的路径?

(a) 展开给定的路径集以包含这些路径的所有前缀,因此从( /root/a/aa1 , /root/d )你得到了吗( /root /root/a /根/a/aa1 , /根/d )

<xsl:template match="*"/> <xsl:copy><xsl:copy-of select="@*"/><xsl:apply-templates/></xsl:copy> ).

(c) 在源文档上运行生成的样式表。

这将删除非白名单节点,从而压缩XML文档:

/// <summary> Siblings including self </summary>
public static IEnumerable<XElement> Siblings(this XElement xml) =>
    xml?.Parent?.Elements() ?? new List<XElement>();

/// <summary> Ancestors, descendants and self </summary>
public static IEnumerable<XElement> AncestorsDescendantsSelf(this XElement xml) =>
    xml?.DescendantsAndSelf()?.Union(xml?.Ancestors() ?? new List<XElement>()) ?? new List<XElement>();

/// <summary> Compress the document by removing everything except the elemnents along selected paths </summary>
/// <param name="xml">source document to be modified</param>
/// <param name="whitelistedPaths">collection of xpath paths</param>
public static void Compress(this XDocument xml, IEnumerable<string> whitelistedPaths) {
    var siblings = nodes.SelectMany(n => n.AncestorsAndSelf()).Aggregate((new List<XElement>()).AsEnumerable(), (n1,n2) => n1.Union(n2.Siblings()));
    var lineages = nodes.SelectMany(n => n.AncestorsDescendantsSelf());
    var nodesToDelete = siblings.Except(lineages).ToList();
    foreach (var element in nodesToDelete) {
        element.Remove();
    }
}

注: 这段代码远不是很快/完美,但它只是工作。