null reference could result

Anonymous — Wed, 07 Apr 2010 18:21:58 GMT

I know some people don't like to see questions here that include any com
interop elements, but this is a dotnet question so does not belong in the
vba group.
acad2009 vbnet 2008 express
how to avoid the compiler warning:
Variable 'ArrayObjects' is used before it has been assigned a value. A null
reference exception could result at runtime.

given
Dim ArrayObjects() As AcadEntity

...some code...

Try

ReDim ArrayObjects(0)

ArrayObjects(UBound(ArrayObjects)) = oSideLine

Catch ex As ApplicationException

m_Util.Logentry("error " & ex.Message)

End Try

...more code...then...

Try

If ArrayObjects Is Nothing Then <------------here is the warning location at
"ArrayObjects"

m_Util.Logentry("error ArrayObjects Is Nothing")

Else

SelectionSetWblock.AddItems(ArrayObjects)

End If

Catch ex As ApplicationException

End Try

what should I be doing in such cases (using an array)

i wouldn't think you'd do Dim ArrayObjects() As AcadEntity = Nothing

like you might with a simple object???

thanks

mark

Re: null reference could result

Anonymous — Wed, 07 Apr 2010 18:34:54 GMT

A 'dotnet question' will probably get more answers on
the relevant Microsoft newsgroups.

This isn't a quesiton about using the managed .NET API,
it is a basic VB.NET language usage question.

I'm sure someone here that's more familiar with VB.NET
will answer you, but I generally don't answer basic language
usage questions here, because this really isn't the VB.NET
(or C#) language newsgroup, this newsgroup is about using
the managed AutoCAD API.

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"mp" wrote in message
news:6368878@discussion.autodesk.com...
I know some people don't like to see questions here that include any com
interop elements, but this is a dotnet question so does not belong in the
vba group.
acad2009 vbnet 2008 express
how to avoid the compiler warning:
Variable 'ArrayObjects' is used before it has been assigned a value. A null
reference exception could result at runtime.

given
Dim ArrayObjects() As AcadEntity

...some code...

Try

ReDim ArrayObjects(0)

ArrayObjects(UBound(ArrayObjects)) = oSideLine

Catch ex As ApplicationException

m_Util.Logentry("error " & ex.Message)

End Try

...more code...then...

Try

If ArrayObjects Is Nothing Then <------------here is the warning location at
"ArrayObjects"

m_Util.Logentry("error ArrayObjects Is Nothing")

Else

SelectionSetWblock.AddItems(ArrayObjects)

End If

Catch ex As ApplicationException

End Try

what should I be doing in such cases (using an array)

i wouldn't think you'd do Dim ArrayObjects() As AcadEntity = Nothing

like you might with a simple object???

thanks

mark

topic null reference could result in .NET Forum

null reference could result

Re: null reference could result