读取具有多个命名空间的 xml

Question

我正在努力获得

<dc:identifier xsi:type="dcterms:URI" >bitstream link</dc:identifier>

和 dc:title、publisher 等在我的 MVC 应用程序中使用 C# 需要帮助，因为我是 xml 新手

<metadata>
  <uketd_dc:uketddc
         xmlns:uketd_dc="http://naca.central.cranfield.ac.uk/ethos-oai/2.0/"
         xmlns:doc="http://www.lyncode.com/xoai"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns:uketdterms="http://naca.central.cranfield.ac.uk/ethos-oai/terms/" 
         xmlns:dcterms="http://purl.org/dc/terms/"
         xmlns:dc="http://purl.org/dc/elements/1.1/"
         xsi:schemaLocation="http://naca.central.cranfield.ac.uk/ethos-oai/2.0/ http://naca.central.cranfield.ac.uk/ethos-oai/2.0/uketd_dc.xsd">
    <dc:date>2010-10-14T17:31:59Z</dc:date>
    <dc:date>2010-10-14T17:31:59Z</dc:date>
    <dc:date>2003-01-01</dc:date>
    <dc:date>2015-06-12T10:34:09Z</dc:date>
    <dcterms:issued>2003-01-01</dcterms:issued>
    <dcterms:isReferencedBy xsi:type="dcterms:URI">http://www.iadb.org/en/publications/publication-detail,7101.html?id=4486</dcterms:isReferencedBy>
    <dcterms:abstract>This book looks at the key issues and lessons that policymakers must consider in designing an adequate framework for dealing with financial crises. These include structural problems and their causes, policy actions, the role of market discipline, and preemptive strategies.</dcterms:abstract>
    <dc:title>Financial Crises in Japan and Latin America</dc:title>
    <dc:creator>Zahler, Roberto</dc:creator>
    <dc:contributor>VICTORCO</dc:contributor>
    <dc:subject>Financial Crises &amp; Economic Stabilization</dc:subject>
    <dc:description>This book looks at the key issues and lessons that policymakers must consider in designing an adequate framework for dealing with financial crises. These include structural problems and their causes, policy actions, the role of market discipline, and preemptive strategies.</dc:description>
    <dc:type>Books</dc:type>
    <dc:identifier>International Lending and Debt Problems</dc:identifier>
    <dc:identifier>International Lending and Debt Problems</dc:identifier>
    <dc:identifier>International Lending and Debt Problems</dc:identifier>
    <dc:identifier>International Lending and Debt Problems</dc:identifier>
    <dc:identifier>International Lending and Debt Problems</dc:identifier>
    <dc:identifier>9781931003476</dc:identifier>
    <dc:identifier>http://www.iadb.org/en/publications/publication-detail,7101.html?id=4486</dc:identifier>
    <dc:language>en</dc:language>
    <dc:publisher>Inter-American Development Bank (IDB)</dc:publisher>
    <dc:identifier xsi:type="dcterms:URI">http://publications.iadb.org/bitstream/handle/11319/195/Financial+Crises+in+Japan+and+Latin+America.pdf?sequence=1</dc:identifier>
    <uketdterms:checksum xsi:type="uketdterms:MD5">83c42636d27d253499be4db09db02312</uketdterms:checksum>
    <dc:identifier xsi:type="dcterms:URI">http://publications.iadb.org/bitstream/handle/11319/195/Financial+Crises+in+Japan+and+Latin+America.pdf.png?sequence=11</dc:identifier>
    <uketdterms:checksum xsi:type="uketdterms:MD5">4d4c1c29a730054db0cfcfc477333626</uketdterms:checksum>
    <dc:identifier xsi:type="dcterms:URI">http://publications.iadb.org/bitstream/handle/11319/195/Financial+Crises+in+Japan+and+Latin+America.pdf.jpg?sequence=5</dc:identifier>
    <uketdterms:checksum xsi:type="uketdterms:MD5">7e49ce2e1c21c12e141aa50402037b25</uketdterms:checksum>
    <dc:identifier xsi:type="dcterms:URI">http://publications.iadb.org/bitstream/handle/11319/195/Financial+Crises+in+Japan+and+Latin+America.pdf.txt?sequence=10</dc:identifier>
    <uketdterms:checksum xsi:type="uketdterms:MD5">bad0c21c28fc8a9946bdfa5eae2bf59d</uketdterms:checksum>
  </uketd_dc:uketddc>
</metadata>

我尝试了以下代码，但无法获取详细信息

XDocument billingData = XDocument.Load("http://publications.iadb.org/oai/request?verb=ListRecords&metadataPrefix=uketd_dc");
XNamespace oai_dc = XNamespace.Get("http://naca.central.cranfield.ac.uk/ethos-oai/2.0/");
XNamespace oai_dc1 = XNamespace.Get("http://naca.central.cranfield.ac.uk/ethos-oai/2.0/ http://naca.central.cranfield.ac.uk/ethos-oai/2.0/uketd_dc.xsd");
XNamespace dc = XNamespace.Get("http://purl.org/dc/elements/1.1/");

var billings = from billing in billingData.Descendants(oai_dc + "uketd_dc").Descendants(oai_dc1 + "dc")
               select new Billing(billing.Element(dc + "title").Value, billing.Element(dc + "creator").Value,
                       billing.Element(dc + "description").Value, billing.Element(dc + "identifier").Value);
allBillings.AddRange(billings.ToList<Billing>());

我不知道我做得对不对。

Answer 1

您的查询正在查找元素本地名称为 uketd_dc 和 dc 的后代。您没有任何具有这些名称的元素 - 这些似乎是名称空间前缀。另外，我不确定您的 oai_dc1 命名空间应该是什么。

你可能想要的是这个：

XNamespace uketd_dc = "http://naca.central.cranfield.ac.uk/ethos-oai/2.0/";
XNamespace dc = "http://purl.org/dc/elements/1.1/";

var billings = from e in doc.Descendants(uketd_dc + "uketddc")
               select new Billing(
                    (string)e.Element(dc + "title"),
                    (string)e.Element(dc + "creator"),
                    (string)e.Element(dc + "description"),
                    (string)e.Element(dc + "identifier")
                    ); 

请注意，您的 XML 有多个元素用于其中的一些（例如标识符）。这将返回第一个。