Where did my exception go?

[dragonwell]

I am binding an editable DataGrid to an ArrayList. The objects in the ArrayList are of a class in my program which has this property

Public Property Capacity() As Integer
  Get
    Return Me._capacity
  End Get
  Set(ByVal value As Integer)
    If value < 0 Then
        Throw New ApplicationException("Capacity must be more than 0.")
    End If
    Me._capacity = value
  End Set
End Property

If I edit the Capacity column in my DataGrid, and enter a value less than 0, I am expecting the exception to be thrown. It is getting thrown - but who is handling it? All that happens is the value is not set. In fact, if I enter a non-integer string, the same thing happens - I guess the question is "where is the value of what is entered into a DataGrid validated?"

I would like to be able to inform the user of this business rule while they edit the object in the DataGrid, not simply reject their values.

Thanks for you help!

 

[ThatRickGuy]

what code do you use to call the property? That is where the exception should be getting handled.

-Rick

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I believe in killer coding ninja monkeys.

 

[dragonwell]

I don't know! I have bound the objects to rows in the DataGrid. When the cells in the DataGrid are edited, the property is set - but not by any code that I wrote.


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[ThatRickGuy]

Interesting. The datagrid must have some level of error handling built in at that level. I'm not sure on that one.

-Rick

VB.Net Forum forum796 forum855 ASP.NET Forum
I believe in killer coding ninja monkeys.