creating properties of data type List

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I have an XML file in string format. The XML file may sometimes contain more that one of the same tags, like it may have multiple msisdn tags. I am using linq to XML to retrieve all of the msisdn's tags values.

I have a class with the property as follow:

private List<int> _msisdn;
public List<int> msisdn
{
   get { return _msisdn; }
   set { _msisdn = value; }
}

when I use a Linq to XML query, I get the error saying:

Object reference not set to an instance of an object.

Here is the linq code:

public void getMsidn(string xml)
        {
            XElement xDoc = XElement.Parse(xml);

            IEnumerable<XElement> da = from p in xDoc.Descendants("msisdn")
                                       select p;

            foreach (XElement x in da)
            {
                _msisdn.Add((int)x);
            }
        }

I want to be able by using this query, add all the values retrieved from the xml to the property mentioned above.

Any help regarding this?

Posted 14-Mar-12 23:22pm

Andrew797

Updated 14-Mar-12 23:24pm

sravani.v

v3

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Lakxman 15-Mar-12 5:38am

Can you let me know on what line does this error occurs? is that in Linq query line? If so, can you please check if xDoc is being null or something?

Andrew797 15-Mar-12 5:46am

I have checked, and the xDoc is not null, it contains the XML file, XElement x is not null, it contains values. the error is given at _msisdn.add((int)x); Is this not maybe because it is expecting me to create a new list, like List<int> _msisdn = new List<int>(); I do not want to do it like that, I want to be able to use the list data type in the property

2 solutions

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Prabhakaran Soundarapandian · Answer 1 · 2012-03-15T00:48:00

Solution 1

Try this one

C#

public void getMsidn(string xml)
        {
            XElement xDoc = XElement.Parse(xml);
 
            IEnumerable<xelement> da = from p in xDoc.Descendants("msisdn")
                                       select p;
 
            foreach (XElement x in da)
            {
                msisdn.Add((int)x);
            }
        }

Posted 15-Mar-12 0:48am

Prabhakaran Soundarapandian

Updated 15-Mar-12 0:50am

v2

Comments

Andrew797 15-Mar-12 6:56am

The same approach as what I have done. Thanks

Andrew797 · Answer 2 · 2012-03-15T00:52:00

I have found a solution myself, using the following approach:

my Property:

XML

private IEnumerable<int> _msisdn;
        public IEnumerable<int> msisdn
        {
            get { return _msisdn; }
            set { _msisdn = value; }
        }

And my linq to xml query:

C#

public void getMsidn(string xml)
        {
            XElement xDoc = XElement.Parse(xml);

            _msisdn = from p in xDoc.Descendants("msisdn")
                                       select (int)p;
        }

This works perfectly for what I need it.

Thanks for the help.