StrataFrame Forum » StrataFrame Application Framework - V1 » Business Objects and Data Access (How do I?) » Error creating custom BO property

Error creating custom BO property

Larry Tucker — Thu, 28 Feb 2008 09:41:51 GMT

I'm getting an error "Object reference not set to an instance of an object." in the FieldPropertyDescriptor code and cannot figure it out. Maybe a second pair of eyes will help. I'm pretty sure it is copied straight from the Help.

(This code is in my StaffBO.vb.)

Thanks,

Larry

[codesnippet]

#Region " Custom Field Properties "

''' <summary>

''' cLastFirst

''' </summary>

''' <remarks></remarks>

<Browsable(False), _

BusinessFieldDisplayInEditor(), _

Description("Staff full name, last name first"), _

DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)> _

Public ReadOnly Property [CLASTFIRST]() As System.String

Get

Return Me.CLASTNAME & ", " & Me.CFIRSTNAME

End Get

End Property

Protected Overrides Function GetCustomBindablePropertyDescriptors() As MicroFour.StrataFrame.Business.FieldPropertyDescriptor()

Return New MicroFour.StrataFrame.Business.FieldPropertyDescriptor() { _

New MicroFour.StrataFrame.Business.ReflectionPropertyDescriptor( _

"cLastFirst", GetType(StaffBO))}

End Function

#End Region

[/codesnippet]

RE: Error creating custom BO property

Trent L. Taylor — Thu, 28 Feb 2008 09:41:51 GMT

No problem :)

RE: Error creating custom BO property

Larry Tucker — Thu, 28 Feb 2008 09:29:48 GMT

Trent,

Thanks for the help. That does it nicely. (I'm trying to study VB syntax along with learning SF and I appreciate the clarifications.)

Larry

RE: Error creating custom BO property

Trent L. Taylor — Thu, 28 Feb 2008 09:15:55 GMT

OK...first of all, the framework and VB.NET are not necessarily case sensitive, but the core of .NET is regarding a type descriptor. Anytime that you create a type descriptor, it should always match the name of your custom property...whether you are in a case sensitive language or not, this is ALWAYS the safest thing since there are other core .NET classes that get used within the framework.

[quote]Second, how would I add a second custom property descriptor to my StaffBO?[/quote]

It may be too late, but there is no need to start another thread. But to do this, just add another item to the array:

[codesnippet]Return New MicroFour.StrataFrame.Business.FieldPropertyDescriptor() { _
New MicroFour.StrataFrame.Business.ReflectionPropertyDescriptor("cLastFirst", GetType(StaffBO)), _
New MicroFour.StrataFrame.Business.ReflectionPropertyDescriptor("MySecondProperty", GetType(StaffBO))}[/codesnippet]

RE: Error creating custom BO property

Larry Tucker — Thu, 28 Feb 2008 09:05:20 GMT

Not to be pushy, but I'm going to start a second thread for this second question "how to a second custom property descriptor". May be more useful for future users and more easily addressed.

Larry

RE: Error creating custom BO property

Larry Tucker — Wed, 27 Feb 2008 15:22:17 GMT

Actually,

Maybe I do need some help... <s>. I'm obviously new to VB and C# and looking at that cryptic and cap sensitive GetCustomBindablePropertiesDescriptors() override, I'm figuring it is C# and not VB. If this is true, how would the function syntax read in VB?

Second, how would I add a second custom property descriptor to my StaffBO?

Thanks,

Larry

RE: Error creating custom BO property

Larry Tucker — Wed, 27 Feb 2008 14:43:05 GMT

Never mind,

The call is apparently cap sensitive, and changing it to "CLASTFIRST" solved it. Ugh... 2 hours wasted. I thought VB wasn't cap sensitive, but apparently some of the guts of the framework are.

Larry