XPathNavigator.SchemaInfo在Mono中导航后为空

Question

我正在使用c#和Mono，并且我想使用XPathNavigator导航XML Schema验证的XmlDocument。关键是，当我遍历文档时，我可以通过XPathNavigator获取每个元素的XML SChema信息。SchemaInfo财产。然而，在我调用XPathNavigator. movetofirstchild()之后，XPathNavigator。SchemaInfo = null。下面是一个例子

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;
            }
        }
    }
}

With this 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>

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

谁有什么建议，是怎么回事，我做错了什么?

谢谢戴夫

PS我说"单声道"，因为这是我正在使用的，我还没有能够在Windows上确认。此外，它的运行时版本是。net 4.0，发生在调试和发布。

UPDATE我刚刚在Windows上尝试了这个，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 . . .

也许是单声道的东西?

Answer 1

我最终提交了一个bug - 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来解决问题，然后在通过XPathNavigator遍历XmlDocument时，使用XPathNavigator中的XmlQualifiedName查找XmlSchemaElement/XmlSchemaAttribute。它有点工作，但也没有，因为XmlQualifiedName不足以唯一地标识模式中的元素实例，例如，一个元素可以在模式中的不同位置使用不同的maxOccurs/minOccurs值。