Linq to xml using ASP.Net

Question

I am trying to poulate all the elements of an order to a listbox. The listbox just adds the collection, not the elements. Please help!

XDocument doc = XDocument.Load(Server.MapPath("App_Data/Orders.xml"));

        string order = ddl.SelectedValue;

        var results = doc.Descendants("Order").Where(o => o.Attribute("OrderNumber").Value == "SO43659")
                         .Select(o => o.Elements("LineItem"));

        foreach (var r in results)
        {
          ListBox1.Items.Add(new ListItem(r.ToString()));

        }

xml fragment:

<Order OrderNumber="SO43659">
    <LineItem Line="1" PID="349" Qty="1" Price="2024.9940" Freight="50.6249" />
    <LineItem Line="2" PID="350" Qty="3" Price="2024.9940" Freight="151.8746" />
    <LineItem Line="3" PID="351" Qty="1" Price="2024.9940" Freight="50.6249" />
    <LineItem Line="4" PID="344" Qty="1" Price="2039.9940" Freight="50.9999" />
    <LineItem Line="5" PID="345" Qty="1" Price="2039.9940" Freight="50.9999" />
    <LineItem Line="6" PID="346" Qty="2" Price="2039.9940" Freight="101.9997" />
    <LineItem Line="7" PID="347" Qty="1" Price="2039.9940" Freight="50.9999" />
    <LineItem Line="8" PID="229" Qty="3" Price="28.8404" Freight="2.1630" />
    <LineItem Line="9" PID="235" Qty="1" Price="28.8404" Freight="0.7210" />
    <LineItem Line="10" PID="218" Qty="6" Price="5.7000" Freight="0.8550" />
    <LineItem Line="11" PID="223" Qty="2" Price="5.1865" Freight="0.2593" />
    <LineItem Line="12" PID="220" Qty="4" Price="20.1865" Freight="2.0187" />
  </Order>

What exactly are you trying to display in the dropdown, any particulat attribute of LineItem? — Bala R
– Bala R, Commented Sep 15, 2011 at 12:35

Daniel Hilgarth · Accepted Answer · 2011-09-15 12:41:51Z

2

var results = doc.Descendants("Order")
                 .Where(o => o.Attribute("OrderNumber").Value == "SO43659")
                 .FirstOrDefault();

foreach (var r in results.Elements("LineItem"))
{
    ListBox1.Items.Add(new ListItem(r.ToString()));
}

edited Sep 15, 2011 at 12:41

Daniel Hilgarth

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answered Sep 15, 2011 at 12:38

ebattulga

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Comments

Jon Skeet · Accepted Answer · 2011-09-15 12:42:19Z

If you didn't use var, you'd see what's wrong - each elements of results is a sequence of elements. Here's your code without var:

IEnumerable<IEnumerable<XElement>> results =
   doc.Descendants("Order")
      .Where(o => o.Attribute("OrderNumber").Value == "SO43659")
      .Select(o => o.Elements("LineItem"));

foreach (IEnumerable<XElement> r in results)
{
    ListBox1.Items.Add(new ListItem(r.ToString()));

}

I suspect that's not what you're after. You could use this instead:

// Will go bang if there isn't exactly one matching order
IEnumerable<XElement> results =
   doc.Descendants("Order")
      .Where(o => o.Attribute("OrderNumber").Value == "SO43659")
      .Single()
      .Select(o => o.Elements("LineItem"));

Or:

// Will find *all* the LineItem elements under *all* matching orders
IEnumerable<XElement> results =
   doc.Descendants("Order")
      .Where(o => o.Attribute("OrderNumber").Value == "SO43659")
      .SelectMany(o => o.Elements("LineItem"));

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