Question

我正在尝试将C14N转换应用于某些生成的XML。看来我不能使用LINQ来检索节点来执行规范化，因此我必须使用DOM进行“旧学校”，但我认为我正在违反默认命名空间。

以下是我的代码示例。

static void Main(string[] args)
{
    XmlDocument xDoc = new XmlDocument();

    // Load some test xml
    string path = @"..\..\TestFiles\Test_1.xml";
    if (File.Exists(path) == true)
    { 
        xDoc.PreserveWhitespace = true;
        using (FileStream fs = new FileStream(path, FileMode.Open))
        {
            xDoc.Load(fs);
        }
    }

    //Instantiate an XmlNamespaceManager object. 
    System.Xml.XmlNamespaceManager xmlnsManager = new System.Xml.XmlNamespaceManager(xDoc.NameTable);

    //Add the namespaces used in books.xml to the XmlNamespaceManager.
    xmlnsManager.AddNamespace("", "http://www.myApps.co.uk/");

    // Create a list of nodes to have the Canonical treatment
        //Execute the XPath query using the SelectNodes method of the XmlDocument.
        //Supply the XmlNamespaceManager as the nsmgr parameter.
        //The matching nodes will be returned as an XmlNodeList.
    XmlNodeList nodeList = xDoc.SelectNodes("/ApplicationsBatch/Applications|/ApplicationsBatch/Applications//*", xmlnsManager);

    // Perform the C14N transform on the data
    XmlDsigC14NTransform transform = new XmlDsigC14NTransform();

    transform.LoadInput(nodeList);
    MemoryStream ms = (MemoryStream)transform.GetOutput(typeof(Stream));

    File.WriteAllBytes(@"..\..\TestFiles\ModifiedTest_1", ms.ToArray());
}

我的XML：

<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<ApplicationsBatch xmlns="http://www.myApps.co.uk/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <MessageHeader>
    <MessageID>00000003</MessageID>
    <Body>11223344556</Body>
    <Timestamp>2011-08-02T09:00:00</Timestamp>
    <MessageCheck>?</MessageCheck>
  </MessageHeader>
  <Applications>
    <Application>
      <ApplicantDetails>
        <Title>MR</Title>
        <Forename>HOMER</Forename>
        <Middlenames>
          <Middlename></Middlename>
        </Middlenames>
        <PresentSurname>SIMPSON</PresentSurname>
        <CurrentAddress>
          <Address>
            <AddressLine1>ADDRESS LINE1</AddressLine1>
            <AddressLine2>ADDRESS LINE2</AddressLine2>
            <AddressTown>ADDRESS Town</AddressTown>
            <AddressCounty>COUNTY</AddressCounty>
            <Postcode>POST CODE</Postcode>
            <CountryCode>GB</CountryCode>
          </Address>
          <ResidentFromGyearMonth>2007-01</ResidentFromGyearMonth>
        </CurrentAddress>
      </ApplicantDetails>
    </Application>
    <Application>
      <ApplicantDetails>
        <Title>MR</Title>
        <Forename>BART</Forename>
        <Middlenames>
          <Middlename></Middlename>
        </Middlenames>
        <PresentSurname>SIMPSON</PresentSurname>
        <CurrentAddress>
          <Address>
            <AddressLine1>ADDRESS LINE1</AddressLine1>
            <AddressLine2>ADDRESS LINE2</AddressLine2>
            <AddressTown>ADDRESS Town</AddressTown>
            <AddressCounty>COUNTY</AddressCounty>
            <Postcode>POST CODE</Postcode>
            <CountryCode>GB</CountryCode>
          </Address>
          <ResidentFromGyearMonth>2007-01</ResidentFromGyearMonth>
        </CurrentAddress>
      </ApplicantDetails>
    </Application>
  </Applications>
</ApplicationsBatch>

我已经阅读了该地区的其他几个主题并遇到了这个问题Gem，但这并没有解决问题。

使用XPath Visualiser显示应该选择所需的节点，但我的代码无法选择任何节点。

Answer 1

我找到了问题的部分答案。

当新的命名空间添加到管理器时，似乎默认命名空间不能是空字符串。这就是我最终的结果：

//Instantiate an XmlNamespaceManager object. 
System.Xml.XmlNamespaceManager xmlnsManager = new System.Xml.XmlNamespaceManager(xDoc.NameTable);

//Add the namespaces used to the XmlNamespaceManager.
xmlnsManager.AddNamespace("x", "http://www.myApps.co.uk/");

然后我需要修改XPath以反映命名空间标识符，如下所示：

// Create a list of nodes to have the Canonical treatment
    //Execute the XPath query using the SelectNodes method of the XmlDocument.
    //Supply the XmlNamespaceManager as the nsmgr parameter.
    //The matching nodes will be returned as an XmlNodeList.
XmlNodeList nodeList = xDoc.SelectNodes("/x:ApplicationsBatch/x:Applications|/x:ApplicationsBatch/x:Applications//*", xmlnsManager);

现在选择了节点并准备好进行转换......尽管这会返回正确的XML结构，但所有值都已被删除，但这是另一个问题的问题。

在C＃中使用带有默认命名空间的Xpath进行规范化

1 个答案: