Question

I have an xml as follows

<Students xmlns="http://AdapterTest">
<Schema name="Schema1" xmlns="urn:schemas-microsoft-com:xml-data" xmlns:dt="urn:schemas-microsoft-com:datatypes">
    <ElementType name="Student" content="empty" model="closed">
        <AttributeType name="Student_id" dt:type="string"/>
        <AttributeType name="Student_Name" dt:type="string"/>
        <attribute type="Student_id"/>
        <attribute type="Student_Name"/>
    </ElementType>
</Schema>
<Student Student_id="123456" Student_Name="Udaya" xmlns="x-schema:#Schema1"/>
<Student Student_id="568923" Student_Name="Christie" xmlns="x-schema:#Schema1"/>
<Student Student_id="741852" Student_Name="Test Name" xmlns="x-schema:#Schema1"/>
<Student Student_id="852789" Student_Name="Sample Name" xmlns="x-schema:#Schema1"/>
</Students>

In my application I am trying to access the nodes using LINQ as follows.

XDocument xdoc1 = XDocument.Load("Customer.xml");

        List<Student> studentList =
            (from _student in xdoc1.Element("Students").Elements("Student")
             select new Student
             {
                 firstName = _student.Attribute("Student_id").Value,
                 lastName = _student.Attribute("Student_Name").Value,


             }).ToList();

It gives me an Object reference not set to an instance of an object.When I remove the xmlns=”http://AdapterTest” from the root element it works fine. What I am missing here

Answer 1

Ive had a similar problem before like this. Like you said if you remove the namespace from the xml it works. You have to do something like this:

XNamespace rootNs = xdoc1.Root.Name.Namespace;
XNamespace studentNS = "x-schema:#Schema1";

And then when selecting nodes prepend the selector with ns, like:

var yourStudentList = xdoc1.Element(rootNS + "Student").Elements(studentNS + "Student");

I havent tested this but it looks similar to and issue i have had.