xpath returns no nodes error

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Tom 713 posts 954 karma points

Jul 19, 2011 @ 09:27
0

XPath Returns no nodes error
Is there a way to get razor to not blow up and instead just let you proceed??

i.e.
```
var collectionsWithProducts = Model.XPath("./productRelease [count(./product) > 0]");
```
and then check for something??
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Tom 713 posts 954 karma points

Jul 19, 2011 @ 09:49

0

i also tried returning a count like so:

var collectionsWithProductsCount = Model.XPath("count(./productRelease [count(./product) > 0])");
  dynamic activeCollection = null;

  if(collectionsWithProductsCount > 0)
  {
  activeCollection = Model.XPath("./productRelease [count(./product) > 0]").FirstOrDefault();
  }

  if(activeCollection != null)
  {

but alas

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Sebastiaan Janssen 5058 posts 15520 karma points MVP admin hq

Jul 19, 2011 @ 10:59

Don't use XPath selectors would be my answer.. but yeah, this should probably be filed as a bug in codeplex.

For now you could either just use XSLT (why use Razor when all you're doing is XPath selections?) or do something like this in Razor:

        var activeCollection = new List<dynamic>();
        @foreach(var item in Model.Children.Where("nodeTypeAlias == \"productRelease\""))
        {
            if(item.Children.Where("nodeTypeAlias == \"product\"").Count() > 1)
            {
                activeCollection.Add(item);
            }
        }

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Tom 713 posts 954 karma points

Jul 20, 2011 @ 00:38

0

A great answer thank you..

sorry still jsut feeling that out! but yes it would be great if they could fix that.. having a pile of exceptions being thrown isn't really a result you'd expect!

I am using razor to learn it but in this instance I thought it'd be cleaner to get the results of the query in a single line of code rather than the approach shown but if that's how it needs to be done! that's how it needs to be done!

Cheers,

Tom

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