NVL & MVVM video series

NVL & MVVM video series

Old forum URL: forums.lhotka.net/forums/t/9538.aspx

TerryH posted on Tuesday, September 14, 2010


Following your video series as a template application I created a NVL, a viewmodel and a view. I can create a datasource that uses the NVL, however when I attempt to drag the datasource's model property onto a usercontrol I get the following error.

"Object reference not set to an instance of an object"

The designer window then throws an exception

"Width and Height must be non-negative"

I then created a simple console application and call the NVL.GetAll method and everything works.

Is there something about a datasource that is bound to a NVL that doesn't work with drag and drop ?

If I drag one of the properties from the NVL datasource I don't receive the first error, but in the usercontrol.resources I received the following error

"The given key was not present in the dictionary (CSLA.NameValueListBase`2

I can create a DynamicBindingListBase using the same table as the NVL and everything works.

mcfin replied on Monday, September 27, 2010

I'm having the same problem.

This does not work:

public class CustomerAccountsList : Csla.NameValueListBase<long, string>

But this does:  

public class CustomerAccountsList : Csla.ReadOnlyListBase<CustomerAccountsList, Csla.NameValueListBase<long, string>.NameValuePair>


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