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我将 C# 与 Mono 一起使用，并且我想使用 XPathNavigator 导航经过 XML Schema 验证的 XmlDocument。关键是当我遍历文档时，我可以通过 XPathNavigator.SchemaInfo 属性获取每个元素的 XML Schema 信息。但是，在我调用 XPathNavigator.MoveToFirstChild() 之后，XPathNavigator.SchemaInfo = null。这是一个例子

using System;

using System.IO;
using System.Xml;
using System.Xml.XPath;
using System.Xml.Schema;

namespace XmlSchemaTest
{
    class Program
    {
        static void Main(string[] args)
        {
            XmlDocument xmlDocument = ReadAndValidateXmlFile(@"../test.xml", @"../test.xsd");

            if (xmlDocument == null)
                Console.WriteLine("Cannot open document or it didn't validate.");
            else
            {
                XPathNavigator xpathNavigator = xmlDocument.CreateNavigator();
                Console.WriteLine("XPathNavigator.SchemaInfo is " + ((xpathNavigator.SchemaInfo == null) ? "null" : "not null"));

                xpathNavigator.MoveToRoot();
                Console.WriteLine("Called XPathNavigator.MoveToRoot()");

                if(xpathNavigator.MoveToFirstChild())
                {
                    Console.WriteLine("XPathNavigator.LocalName after .MoveToFirstChild() succeeded = " + xpathNavigator.LocalName);
                    Console.WriteLine("XPathNavigator.NodeType value = " + xpathNavigator.NodeType.ToString());
                    Console.WriteLine("XPathNavigator.SchemaInfo is " + ((xpathNavigator.SchemaInfo == null) ? "null" : "not null"));
                }
            }

            //Console.ReadLine();
        }

        private static XmlDocument ReadAndValidateXmlFile(string xmlPath, string xsdPath)
        {
            // Load the XML Schema
            bool anyValidationErrors = false;
            XmlSchemaSet oSchemaSet = new XmlSchemaSet();
            ValidationEventHandler Handler = new ValidationEventHandler((object sender, ValidationEventArgs args) => {Console.WriteLine(args.Message); anyValidationErrors = true;} );
            oSchemaSet.ValidationEventHandler += Handler;
            XmlSchema oSchema = null;
            using (StreamReader sr = new StreamReader(xsdPath)) {
                oSchema = XmlSchema.Read(sr, Handler);  
            }
            if (anyValidationErrors || (oSchema == null)) {
                Console.WriteLine("Schema validation errors");
                return null;    
            }
            oSchemaSet.Add(oSchema);

            // Set up the Xml reader to do schema validation
            XmlReaderSettings xmlReaderSettings = new XmlReaderSettings();
            xmlReaderSettings.ValidationType = ValidationType.Schema;
            xmlReaderSettings.Schemas.Add(oSchemaSet);
            anyValidationErrors = false;
            xmlReaderSettings.ValidationEventHandler += new ValidationEventHandler((object sender, ValidationEventArgs args) => {Console.WriteLine(args.Message); anyValidationErrors = true;} );

            // Load the Xml and validate against schemer
            using (XmlReader xmlReader = XmlReader.Create(xmlPath, xmlReaderSettings))
            {
                XmlDocument xmlDocument = new XmlDocument();
                xmlDocument.Load(xmlReader);

                if (anyValidationErrors) {
                    Console.WriteLine("Xml validation errors");
                    return null;
                }
                else
                    return xmlDocument;
            }
        }
    }
}

有了这个 XSD

<?xml version="1.0" encoding="utf-8"?>
<xs:schema id="TEST" 
            targetNamespace="urn:test" 
            xmlns:tst="urn:test" 
            xmlns="urn:test" 
            elementFormDefault="qualified"
            xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="TestElement">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="SubEle">
          <xs:complexType>
            <xs:sequence>
              <xs:element name="ChildEle" type="xs:unsignedInt" />
            </xs:sequence>
          </xs:complexType>
        </xs:element>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>

而这个 XML

<?xml version="1.0" encoding="utf-8" ?>
<tst:TestElement xmlns:tst="urn:test">
  <tst:SubEle>
    <tst:ChildEle>123</tst:ChildEle>
  </tst:SubEle>
</tst:TestElement>

给出这个输出

XPathNavigator.SchemaInfo is not null
Called XPathNavigator.MoveToRoot()
XPathNavigator.LocalName after .MoveToFirstChild() succeeded = TestElement
XPathNavigator.NodeType value = Element
XPathNavigator.SchemaInfo is null

有人对正在发生的事情或我做错了什么有建议吗？

谢谢戴夫

PS我说“单声道”是因为那是我正在使用的，我还不能在 Windows 上确认。此外，它的运行时版本是 .Net 4.0，发生在 Debug 和 Release 中。

更新我刚刚在 Windows 上尝试过这个并得到了这个结果

XPathNavigator.SchemaInfo is not null
Called XPathNavigator.MoveToRoot()
XPathNavigator.LocalName after .MoveToFirstChild() succeeded = TestElement
XPathNavigator.NodeType value = Element
XPathNavigator.SchemaInfo is not null
Press any key to continue . . .

所以也许是 Mono 的事情？

4

1 回答 1

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我最终提交了一个错误 - https://bugzilla.xamarin.com/show_bug.cgi?id=9541

我正在通过从 XmlSchemaSet 中的根 XmlSchemaElement 遍历并通过 XmlQualifiedName 记录所有 XmlSchemaElements 和 XmlSchemaAttributes，然后在通过 XPathNavigator 遍历 XmlDocument 时使用 XPathNavigator 中的 XmlQualifiedName 来查找 XmlSchemaElement/XmlSchemaAttribute 来解决该问题。它有点工作，但也没有，因为 XmlQualifiedName 不足以唯一地标识架构中的元素实例，例如，一个元素可以在具有不同 maxOccurs/minOccurs 值的架构中的不同位置使用。

于 2013-01-24T09:43:35.477 回答