Reading XML using XDocument & Linq - check if element is NULL?

Question

I'm using LINQ together with XDocument to read a XML File. This is the code:

XDocument xml = XDocument.Load(filename);  var q = from b in xml.Descendants("product")         select new         {             name = b.Element("name").Value,             price = b.Element("price").Value,                                 extra = b.Element("extra1").Value,             deeplink = b.Element("deepLink").Value                            }; 

Now the problem is, the extra1 field is not always present. There are items in the XML file without that node. If that happens it's crashing with a NullReferenceException.

Is there any possibility to include a "check if null" so I can prevent it from crashing?

Answer 1

Use (string) instead of .Value:

var q = from b in xml.Descendants("product")         select new         {             name = (string)b.Element("name"),             price = (double?)b.Element("price"),                                 extra = (string)b.Element("extra1"),             deeplink = (string)b.Element("deepLink")                            }; 

This also works with other datatypes, including many nullable types in case the element is not always present.

Answer 2

You can use "null coalescing" operator:

var q = from b in xml.Descendants("product")         select new         {             name = (string)b.Element("name") ?? "Default Name",             price = (double?)b.Element("price") ?? 0.0,                                 extra = (string)b.Element("extra1") ?? String.Empty,             deeplink = (string)b.Element("deepLink") ?? String.Empty                            }; 

This way, you will have full control about default value used when there's no element.