checking for dynamic child nodes

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Allan Michaelsen 14 posts 33 karma points

Mar 04, 2011 @ 01:03
0

Checking for dynamic child nodes
I would like to know if it's possible to check ig a page has specific child nodes. I have something like this:
```
@{
if(Model.someDocName != null && Model.someDocName.Count() > 0)
{
  some code...
}
```
But i keep getting this error: Cannot perform runtime binding on a null reference.

Is it not possible to check for the specific child node or what's the trick to doing so.
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Gareth Evans 143 posts 335 karma points c-trib

Mar 09, 2011 @ 08:01

0

What version? I think this is fixed in RC1

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Allan Michaelsen 14 posts 33 karma points

Mar 09, 2011 @ 20:24

0

I use RC1 with all Razor scripts, but a couple of things bugs me sometimes, this being one of them... :D

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Gareth Evans 143 posts 335 karma points c-trib

Mar 09, 2011 @ 21:49

0

In RC1, the return type will be DynamicNull when no property or children exist.

I've checked your syntax and it indeed doesn't work in RC1.

This is because

if(Model.someDocName != null [true; DynamicNull != null] && Model.someDocName.Count() [error; .Count doesn't exist on DynamicNull] > 0)
{
some code...

RC2 is just around the corner, and I have already added support for accessing properties off a DynamicNull

Model.someDocName.Count => DynamicNull

To solve the requirement, i've also added a .Count() function, .IsNull property and .HasValue (reverse of IsNull) property.

This lets your original syntax work.

For now, if you do this:

@using umbraco.MacroEngines

if(Model.someDocType.GetType() != typeof(DynamicNull))
{

...

}

Then it will behave how you expect in RC1 and RC2

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Allan Michaelsen 14 posts 33 karma points

Mar 12, 2011 @ 10:57

0

Thanks Gareth

I'll look forward to the next release... :)

I would like to say this was solve, but i can't see the check mark to do so... But i consider it a satisfying answer.

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Allan Michaelsen 14 posts 33 karma points

Mar 12, 2011 @ 10:58

0

DO' allready marked as solve... My bad...

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Checking for dynamic child nodes