How to get IXmlNamespaceResolver

Question

I am trying to call an overload of XElement.XPathSelectElements () which requires an IXmlNamespaceResolver object. Can someone show me how to get (or make) IXmlNamespaceResolver? I have a list of namespaces that I want to use in my query

Answer 1

You can use the XmlNamespaceManager that implements this interface.

Use a constructor that takes an XmlNameTable by passing it an instance of System.Xml.NameTable through new NameTable() . You can then call the AddNamespace function to add namespaces:

 var nsMgr = new XmlNamespaceManager(new NameTable()); nsMgr.AddNamespace("ex", "urn:example.org"); nsMgr.AddNamespace("t", "urn:test.org"); doc.XPathSelectElements("/ex:path/ex:to/t:element", nsMgr); 

Answer 2

Use new XmlNamespaceManager(new NameTable()) .

For example, if you have an XML document that uses namespaces such as

 var xDoc = XDocument.Parse(@"<m:Student xmlns:m='http://www.ludlowcloud.com/Math'> <m:Grade>98</m:Grade> <m:Grade>96</m:Grade> </m:Student>"); 

then you can get the Grade nodes by doing

 var namespaceResolver = new XmlNamespaceManager(new NameTable()); namespaceResolver.AddNamespace("math", "http://www.ludlowcloud.com/Math"); var grades = xDoc.XPathSelectElements("//math:Student/math:Grade", namespaceResolver); 

Answer 3

I found this post while searching for how to use the [XPathSelectElements ()] overload to process a SOAP response, so I will post my answer if it is useful to others who have a document with multiple namespace definitions. In my case, I have a document like this:

 <?xml version="1.0" encoding="utf-8"?> <soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <soap:Body> <queryResponse xmlns="http://SomeUrl.com/SomeSection"> <response> <theOperationId>105</theOperationId> <theGeneraltheDetailsCode>0</theGeneraltheDetailsCode> <theDetails> <aDetail> <aDetailId>111</aDetailId> <theValue>Some Value</theValue> <theDescription>Some description</theDescription> </aDetail> <aDetail> <aDetailId>222</aDetailId> <theValue>Another Value</theValue> <theDescription>Another description</theDescription> </aDetail> <aDetail> <aDetailId>333</aDetailId> <theValue>And another Value</theValue> <theDescription>And another description</theDescription> </aDetail> </theDetails> </response> </queryResponse> </soap:Body> </soap:Envelope> 

To create [XDocument]:

 var theDocumentXDoc = XDocument.Parse( theDocumentContent ); 

To create [XmlNamespaceManager], I use:

 var theNamespaceIndicator = new XmlNamespaceManager( new NameTable() ); theNamespaceIndicator.AddNamespace( "theSoapNS", "http://www.w3.org/2003/05/soap-envelope" ); theNamespaceIndicator.AddNamespace( "noSuffNS" , "http://SomeUrl.com/SomeSection" ); 

The names that I use for prefixes ("theSoapNS" and "noSuffNS") are arbitrary. Use a name convenient for readable code.

To select the [Envelope] element, I use:

 var theEnvelope = theDocumentXDoc.XPathSelectElement( "//theSoapNS:Envelope", theNamespaceIndicator ); 

To select the [queryResponse] element:

 var theQueryResponse = theDocumentXDoc.XPathSelectElement( "//theSoapNS:Envelope/theSoapNS:Body/noSuffNS:queryResponse", theNamespaceIndicator ); 

To select all the details in [theDetails]:

 var theDetails = theDocumentXDoc.XPathSelectElement( "//theSoapNS:Envelope/theSoapNS:Body/noSuffNS:queryResponse/noSuffNS:response/noSuffNS:theDetails", theNamespaceIndicator ); 

The following is an example program (C # 6) using a selection:

 //The usings you need: using System; using System.Linq; using System.Xml; using System.Xml.Linq; using System.Xml.XPath; namespace ProcessXmlCons { class Inicial { static void Main(string[] args) { new Inicial().Tests(); } private void Tests() { Test01(); } private void Test01() { var theDocumentContent = @"<?xml version=""1.0"" encoding=""utf-8""?> <soap:Envelope xmlns:soap=""http://www.w3.org/2003/05/soap-envelope"" xmlns:xsi=""http://www.w3.org/2001/XMLSchema-instance"" xmlns:xsd=""http://www.w3.org/2001/XMLSchema""> <soap:Body> <queryResponse xmlns=""http://SomeUrl.com/SomeSection""> <response> <theOperationId>105</theOperationId> <theGeneraltheDetailsCode>0</theGeneraltheDetailsCode> <theDetails> <aDetail> <aDetailId>111</aDetailId> <theValue>Some Value</theValue> <theDescription>Some description</theDescription> </aDetail> <aDetail> <aDetailId>222</aDetailId> <theValue>Another Value</theValue> <theDescription>Another description</theDescription> </aDetail> <aDetail> <aDetailId>333</aDetailId> <theValue>And another Value</theValue> <theDescription>And another description</theDescription> </aDetail> </theDetails> </response> </queryResponse> </soap:Body> </soap:Envelope> "; var theDocumentXDoc = XDocument.Parse(theDocumentContent); var theNamespaceIndicator = new XmlNamespaceManager(new NameTable()); theNamespaceIndicator.AddNamespace("theSoapNS", "http://www.w3.org/2003/05/soap-envelope"); theNamespaceIndicator.AddNamespace("noSuffNS", "http://SomeUrl.com/SomeSection"); var theEnvelope = theDocumentXDoc.XPathSelectElement("//theSoapNS:Envelope", theNamespaceIndicator); Console.WriteLine($"The envelope: {theEnvelope?.ToString()} "); var theEnvelopeNotFound = theDocumentXDoc.XPathSelectElement("//Envelope", theNamespaceIndicator); Console.WriteLine("".PadRight(120, '_')); //Visual divider Console.WriteLine($"The other envelope: \r\n {theEnvelopeNotFound?.ToString()} "); var theQueryResponse = theDocumentXDoc.XPathSelectElement("//theSoapNS:Envelope/theSoapNS:Body/noSuffNS:queryResponse", theNamespaceIndicator); Console.WriteLine("".PadRight(120, '_')); //Visual divider Console.WriteLine($"The query response: \r\n {theQueryResponse?.ToString()} "); var theDetails = theDocumentXDoc.XPathSelectElement("//theSoapNS:Envelope/theSoapNS:Body/noSuffNS:queryResponse/noSuffNS:response/noSuffNS:theDetails", theNamespaceIndicator); Console.WriteLine("".PadRight(120, '_')); //Visual divider Console.WriteLine($"The details: \r\n {theDetails?.ToString()} "); Console.WriteLine("".PadRight(120, '_')); //Visual divider foreach (var currentDetail in theDetails.Descendants().Where(elementToFilter => elementToFilter.Name.LocalName != "aDetail")) { Console.WriteLine($"{currentDetail.Name.LocalName}: {currentDetail.Value}"); } //Not optimal. Just to show XPath select within another selection: Console.WriteLine("".PadRight(120, '_')); //Visual divider Console.WriteLine("Values only:"); foreach (var currentDetail in theDetails.Descendants()) { var onlyTheValueElement = currentDetail.XPathSelectElement("noSuffNS:theValue", theNamespaceIndicator); if (onlyTheValueElement != null) { Console.WriteLine($"--> {onlyTheValueElement.Value}"); } } } } //class Inicial } //namespace ProcessXmlCons