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Ebay API – Parse XML null reference exception error? C# ASP

I am super stuck on a simple api usage for over a week now. Here are the details.

Trying to make an api call to ebay.com.
Here is what my code looks like…

This is the starting pages code:

 protected void Button1_Click(object sender, EventArgs e)
    {
        Response.Redirect("Results.aspx?Keywords=" + searchString.Text);  
    }

The page is directed to this bit of code:

if (Request.QueryString["Keywords"] != null){
        string keywords = Request.QueryString["Keywords"];
            string myAppID = "HIDDEN";
            var xml = XDocument.Load("http://svcs.ebay.com/services/search/FindingService/v1?OPERATION-NAME=findItemsByKeywords&SERVICE-VERSION=1.0.0&SECURITY-APPNAME=" + myAppID + "&RESPONSE-DATA-FORMAT=XML&REST-PAYLOAD&keywords=" + keywords + "&paginationInput.entriesPerPage=5");
            XNamespace ns = "http://www.ebay.com/marketplace/search/v1/services";
            var titles = from item in xml.Root.Descendants(ns + "title")
                              select new{
                                  title = xml.Descendants(ns + "title").Select (x => x.Value),
                              };
        foreach (var item in titles){
                Label1.Text += item;
            } 
        }

Here is the xml example:

<findItemsByKeywordsResponse xmlns="http://www.ebay.com/marketplace/search/v1/services">
<searchReslut count="5">
<item>
    <title></title>
</item>
<item>
    <title></title>
</item>
<item>
    <title></title>
</item>

I really rather turn the items into an array not just list them out. Just thought I would try the easier approach first. Error I get is:
The for loop output to my label looks like this:

{ title = System.Linq.Enumerable+WhereSelectEnumerableIterator`2[System.Xml.Linq.XElement,System.String] }{ title = System.Linq.Enumerable+WhereSelectEnumerableIterator`2[System.Xml.Linq.XElement,System.String] }{ title = System.Linq.Enumerable+WhereSelectEnumerableIterator`2[System.Xml.Linq.XElement,System.String] }{ title = System.Linq.Enumerable+WhereSelectEnumerableIterator`2[System.Xml.Linq.XElement,System.String] }{ title = System.Linq.Enumerable+WhereSelectEnumerableIterator`2[System.Xml.Linq.XElement,System.String] }

And the output exception is:

A first chance exception of type ‘System.Threading.ThreadAbortException’ occurred in mscorlib.dll
An exception of type ‘System.Threading.ThreadAbortException’ occurred in mscorlib.dll but was not handled in user code
The thread ” (0x27ee4) has exited with code 0 (0x0).

Any help is appreciated!

Tags:

2

Answers


  1. 0

    The exception is coming from:

    var titles = from item in xml.Root.Descendants(ns + "title")
             select new
             {
                 title = item.Parent.Element("title").Value,
             };

    You don’t need to go to the parent, you can just directly get the value of title since that is what you are searching for:

    xml.Descendants(ns + "title").Select (x => x.Value)

    Also, please take a look here Asking Better Questions, as it’ll likely get you faster/better responses. There is a ton of code in your question that is not relevant, and is hard to parse to get to what you actually need help with.

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  2. 0

    This should be fairly simple to accomplish. Try using the code below. The top part I am just setting up your sample XML from your example and parsing it to a XElement (note: some closing tags were missing, also I am assuming the ‘searchReslut’ node is supposed to be ‘searchResult’). Next, I am grabbing all of the descendant nodes from the root node that have a name of ‘title’ and where the value is not null. Then I am simply looping through the IEnumerable that is created, and concatenating the text of the label. Let me know if there are any questions.

    string ns = "http://www.ebay.com/marketplace/search/v1/services";
string returnedXml = "<findItemsByKeywordsResponse xmlns="" + ns + "">" +
                    "<searchReslut count="5">" +
                        "<item>" +
                            "<title>Title1</title>" +
                        "</item>" +
                        "<item>" +
                            "<title>Title2</title>" +
                        "</item>" +
                        "<item>" +
                            "<title>Title3</title>" +
                        "</item>" +
                     "</searchReslut>" +
                    "</findItemsByKeywordsResponse>";
        XElement xml = XElement.Parse(returnedXml);
        IEnumerable<XElement> titleNodes = xml.Descendants("title").Where(x => x.Value != null);
        foreach (XElement t in titleNodes)
        {
            Label1.Text += t.Value;
        }
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