Object reference not set to an instance of an object

Question

I have the following code -

private static void convert()
    {
        string csv = File.ReadAllText("test.csv");
        XDocument doc = ConvertCsvToXML(csv, new[] { "," });
        doc.Save("update.xml");

        XmlTextReader reader = new XmlTextReader("update.xml");
        XmlDocument testDoc = new XmlDocument();
        testDoc.Load(@"update.xml");

        XDocument turnip = XDocument.Load("update.xml");
        webservice.function[] test = new webservice.function[1];
        webservice.function CallWebService = new webservice.function();

        foreach(XElement el in turnip.Descendants("row"))
        {
                            test[0].com = System.Convert.ToInt32(el.Descendants("var").Where(x => (string)x.Attribute("name") == "com").SingleOrDefault().Attribute("value").Value);
            test[0].Centre = el.Descendants("var").Where(x => (string)x.Attribute("name") == "Centre").SingleOrDefault().Attribute("value").Value;
            test[0].CCentre = el.Descendants("var").Where(x => (string)x.Attribute("name") == "CCentre").SingleOrDefault().Attribute("value").Value;

            MessageBox.Show(test[0].person, "person");
            MessageBox.Show(System.Convert.ToString(test[0].actually), "Actually");
            MessageBox.Show(System.Convert.ToString(test[0].com), "Com");

            CallWebService.updateFeedStatus(test);
        }

It is coming up with the error of - NullReferenceException was unhandled, saying that the object reference not set to an instance of an object. The error occurs on the first line test[0].account.

How can I get past this?

Why are you creating an array of size 1, instead of just an instance of the relevant class? — Nellius, Jan 11 '11 at 16:50
possible duplicate of [What is a NullReferenceException in .NET?](http://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-in-net) — John Saunders, Jan 11 '11 at 16:54
@John Saunders: This question was asked before that one, and is more specific — Nellius, Jan 11 '11 at 16:54
@Nellius: it should perhaps be edited to say, "help me find my bug". Under no circumstances should it have the current title. — John Saunders, Jan 11 '11 at 16:58
Possible duplicate of [What is a NullReferenceException, and how do I fix it?](http://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-and-how-do-i-fix-it) — tom redfern, Jan 11 '17 at 10:30

score 6 · Accepted Answer · answered Jan 11 '11 at 16:50

Initializing an array does not initialize the objects in the array. Try adding the second line below (assuming you want to use the default constructor):

webservice.singleSummary[] test = new webservice.singleSummary[1];
test[0] = new webservice.singleSummary();

score 2 · Answer 2 · answered Jan 11 '11 at 16:48

Put a debugger on the process.
Identify which line of code is generating the error. (Assuming Visual Studio)
Test the object references on that line one by one until you determine which one has the null reference.
Put in a null check before the line to fix the problem.

score 1 · Answer 3 · answered Jan 11 '11 at 16:51

1

I'm guessing your xml has a namespace that you need to include in your xname for the desired elements, but as the other comments mention, there is little that can be done without full disclosure.

answered Jan 11 '11 at 16:51

jjrdk

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Object reference not set to an instance of an object

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