Parsing xml with name space with namespace prefix that appears twice

Question

i have te next xml :

<samlp:Response xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol" 
xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion" Consent="urn:oasis:names:tc:SAML:2.0:consent:obtained" 
>
    <samlp:Status>
        <samlp:StatusCode Value="urn:oasis:names:tc:SAML:2.0:status:Success"/>
    </samlp:Status>
</samlp:Response>

i tried to parse it with next code (i want to get the value of the "value" attribute which is in : samlp:StatusCode):
XmlDocument xmlDocument=new ConfigXmlDocument();
what do i miss here?
xmlDocument.Load(@"c:\file1.xml");
//determine whether document contains namespace
var namespaceName = "samlp";
var namespacePrefix = string.Empty;
var xmlns = xmlDocument.FirstChild.Attributes?["xmlns:samlp"];
if (xmlns != null)
{
var nameSpaceManager = new XmlNamespaceManager(xmlDocument.NameTable);
nameSpaceManager.AddNamespace(namespaceName, xmlns.Value);
namespacePrefix = namespaceName + ":";
}

            XmlNode node = xmlDocument.SelectSingleNode("StatusCode");

Answer 1

Hi @wantto wantto ,

It is better to use LINQ to XML API. It is available in the .Net Framework since 2007.

XML

<samlp:Response xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol"  
                xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion"  
                Consent="urn:oasis:names:tc:SAML:2.0:consent:obtained">  
 <samlp:Status>  
 <samlp:StatusCode Value="urn:oasis:names:tc:SAML:2.0:status:Success"/>  
 </samlp:Status>  
</samlp:Response>  

c#

void Main()  
{  
 const string fileName = @"e:\Temp\wantto.xml";  
 XDocument xdoc = XDocument.Load(fileName);  
  
 XNamespace ns = xdoc.Root.GetNamespaceOfPrefix("samlp");  
 XElement xelem = xdoc.Descendants(ns + "StatusCode").FirstOrDefault();  
  
 Console.WriteLine("StatusCode: {0}", xelem.Attribute("Value").Value.Split(':').Select(sValue => sValue).ToArray().Last());  
}  

Output

StatusCode: Success  

Answer 2

To get the value of attribute:

XmlNamespaceManager nsm = new XmlNamespaceManager( xmlDocument.NameTable );
nsm.AddNamespace( "samlp", "urn:oasis:names:tc:SAML:2.0:protocol" );

string value = xmlDocument.SelectSingleNode( "/samlp:Response/samlp:Status/samlp:StatusCode/@Value", nsm ).Value;