Question

我正在尝试使用C＃读取XML文档，我这样做：

XmlDocument myData = new XmlDocument();
myData.Load("datafile.xml");

无论如何，我有时会在阅读XmlNode.ChildNodes时收到评论。

为了让谁遇到同样的要求，最后我就是这样做的：

/** Validate a file, return a XmlDocument, exclude comments */
private XmlDocument LoadAndValidate( String fileName )
{
    // Create XML reader settings
    XmlReaderSettings settings = new XmlReaderSettings();
    settings.IgnoreComments = true;                         // Exclude comments
    settings.ProhibitDtd = false;                           
    settings.ValidationType = ValidationType.DTD;           // Validation

    // Create reader based on settings
    XmlReader reader = XmlReader.Create(fileName, settings);

    try {
        // Will throw exception if document is invalid
        XmlDocument document = new XmlDocument();
        document.Load(reader);
        return document;
    } catch (XmlSchemaException) {
        return null;
    }
}

谢谢你托马索

Answer 1

您可以使用XmlReader XmlReaderSettings.IgnoreComments设置为true：

XmlReaderSettings readerSettings = new XmlReaderSettings();
readerSettings.IgnoreComments = true;
using (XmlReader reader = XmlReader.Create("input.xml", readerSettings))
{
    XmlDocument myData = new XmlDocument();
    myData.Load(reader);
    // etc...
}

（通过搜索here来自XmlDocument ignore comments）

Answer 2

foreach(XmlNode node in nodeList)
  if(node.NodeType != XmlNodeType.Comment)
     ...

Answer 3

您只需在ChildNodes上添加过滤器即可。 E.g。

var children = myNode.ChildNodes.Cast<XmlNode>().Where(n => n.NodeType != XmlNodeType.Comment);

或者，您可以使用XmlReaderSettings.IgnoreComments为真的设置加载传入XmlReader的XmlDocument。

using (var file = File.OpenRead("datafile.xml"))
{
    var settings = new XmlReaderSettings() { IgnoreComments = true, IgnoreWhitespace = true };
    using (var xmlReader = XmlReader.Create(file, settings))
    {
        var document = new XmlDocument();
        document.Load(xmlReader);

        // Process document nodes...
    }
}

Answer 4

使用XmlReaderSettings

XmlReaderSettings readerSettings = new XmlReaderSettings();
readerSettings.IgnoreComments = true;
XmlReader reader = XmlReader.Create(sourceFilePath, readerSettings);
XmlDocument myXmlDoc = new XmlDocument();
myXmlDoc.Load(reader);

Answer 5

Dim pattern As String = String.Empty
Dim xDoc As XmlDocument = New XmlDocument()

xDoc.Load(path)

''Pattern of comments
pattern = "(<!--.*?--\>)"
xDoc.InnerXml = Regex.Replace(xDoc.InnerXml, pattern, String.Empty, RegexOptions.Singleline)

<!--aftr this run ur code-->

Answer 6

如果要使用XmlDocument而不是XmlReader，最好按名称或使用XPath引用子节点。

然后您不必担心已添加的评论或其他节点，或订单已更改。

XmlDocument myData = new XmlDocument();
myData.Load("datafile.xml");

XmlNode DocNode = myData.DocumentElement;

XmlNode Child = DocNode ["SomeChildNode"];

这将选择“SomeChildNode”，它是根元素的子元素。

下一个示例将遍历books.xml中的所有书籍并打印作者。它使用字符串属性选择器和Xpath。它不应受评论等影响。

XmlDocument myData = new XmlDocument();
myData.Load("books.xml");

XmlNode DocNode = myData.DocumentElement;

XmlNodeList BookNodeList = DocNode.SelectNodes("./book");

foreach (XmlNode Book in BookNodeList)
{
    Console.WriteLine(Book["author"].InnerText);
}

注意，使用XPath，您可以使用“.// book”之类的内容轻松搜索文档中的所有书籍元素。

的books.xml：

<?xml version="1.0"?>
<catalog>
   <book id="bk101">
      <author>Gambardella, Matthew</author>
      <title>XML Developer's Guide</title>
      <genre>Computer</genre>
      <price>44.95</price>
      <publish_date>2000-10-01</publish_date>
      <description>An in-depth look at creating applications 
      with XML.</description>
   </book>
   <book id="bk102">
      <author>Ralls, Kim</author>
      <title>Midnight Rain</title>
      <genre>Fantasy</genre>
      <price>5.95</price>
      <publish_date>2000-12-16</publish_date>
      <description>A former architect battles corporate zombies, 
      an evil sorceress, and her own childhood to become queen 
      of the world.</description>
   </book>
<catalog>

参考文献：

XmlNode.Item属性（字符串）hxxp：//msdn.microsoft.com/en-us/library/sss31aas.aspx XmlNode.SelectNodes方法（字符串）http://msdn.microsoft.com/en-us/library/hcebdtae.aspx XmlNode.SelectSingleNode方法（字符串）http://msdn.microsoft.com/en-us/library/fb63z0tw.aspx

在将XML文件读入XmlDocument时如何忽略注释？

6 个答案: