Sorting: NullReferenceException

[Tomasz M.Lipiński]

Hi,

my grid displays - for example - organization units: OrgUnit objects. The OrgUnit class has a property "Manager" which contains an instance of the class "Person". This class has, in turn, a property named "FullName".
I want to display names of managers in one of the grid's columns. I bind this column with: "Manager.FullName". And it works perfectly - event for units with no manager.
Then, I want to sort my grid by this column. I put SortExpression="Manager.FullName". It works - but fails (NullReferenceException) when any of displayed units has no manager.
I understand that "Manager.FullName" can raise this exception when "Manager" is null but when displaying data it doesn't.
Can I solve this problem any way?
The workaround: define a special property "ManagerFullName" (return Manager == null ? "" : Manager.FullName) is not acceptable.

Regrads
Tomasz

[Tsvetoslav]

Hi Tomasz,

I tried to reproduce the issue in the sample attached - but had no success in that. Could you take a look at it and direct me how to modify it in order for the problem to be reproduced.

All the best,
Tsvetoslav
the Telerik team

[Tomasz M.Lipiński]

Hi,

The attached example was not exact. The grid contains columns:
- Name
- Configuration.Description
- SkuAvailable.Minutes
Null was set for SkuAvailable.Minutes only. The point is to set null to SkuAvailable or Configuration.
I've improved your example by adding a single line of the constructor of the Movie class:

if (minutes.HasValue)
  _Configuration = new Config(descConfig);

Well, I've been surprised: it's my case of data but it works...
I've compared both RadGrids (yours and mine). The only difference was in EnableLinqExpressions attribute: your grid has "false" and mine has this attribute not set. I've put EnableLinqExpressions="false" to my RadGrid and it's started to work.
My grids don't use filtering at all. Is EnableLinqExpressions used for anything else?

Thanks for the solution - even if indirect :-)

Regards
Tomasz