I tried this VB.NET 2003 (.Net runtime 1.1):

Dim o As Object = DirectCast(Nothing, HashTable)
If IsNothing(o) Then
Debug.WriteLine("Nothing")
Else
Debug.WriteLine("Something")
End If

Guess what: o is not Nothing!
Is this a bug or a feature? By the way: CType(Nothing, HashTable) returns
Nothing as I would expect.

Guido

hi Guido,

recheck your code. I tested it and cannot reproduce. I get o is Nothing.


Bill.


"Guido Kraus" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> I tried this VB.NET 2003 (.Net runtime 1.1):
>
> Dim o As Object = DirectCast(Nothing, HashTable)
> If IsNothing(o) Then
> Debug.WriteLine("Nothing")
> Else
> Debug.WriteLine("Something")
> End If
>
> Guess what: o is not Nothing!
> Is this a bug or a feature? By the way: CType(Nothing, HashTable) returns
> Nothing as I would expect.
>
> Guido
>
>

* "Guido Kraus" <(E-Mail Removed)> scripsit:
> I tried this VB.NET 2003 (.Net runtime 1.1):
>
> Dim o As Object = DirectCast(Nothing, HashTable)
> If IsNothing(o) Then
> Debug.WriteLine("Nothing")
> Else
> Debug.WriteLine("Something")
> End If
>
> Guess what: o is not Nothing!
> Is this a bug or a feature? By the way: CType(Nothing, HashTable) returns
> Nothing as I would expect.

I am not able to repro that in .NET 1.1, VB.NET 2003.

--
Herfried K. Wagner [MVP]
<URL:http://dotnet.mvps.org/>

Hi Guido,

Yeh, I get the same in the watch window, but I still get the result to be
Nothing when actually run:
e.g:

Console.Writeline( DirectCast(Nothing, Hashtable) Is Nothing)

returns True.

What does your watch window say for :
DirectCast(Nothing, Hashtable) Is Nothing




"Guido Kraus" <(E-Mail Removed)> wrote in message
news:OE%(E-Mail Removed)...
> Hi Bill,
>
> I made a screenshot of my Watch window (I have the German version of VS.NET
> but I everybody will understand it).
>
> Guido
>
> "Bill McCarthy <no spam>" <bill_mcc &#64; iprimus.com.au> schrieb im
> Newsbeitrag news:e6$$(E-Mail Removed)...
> > hi Guido,
> >
> > recheck your code. I tested it and cannot reproduce. I get o is Nothing.
> >
> >
> > Bill.
> >
> >
> > "Guido Kraus" <(E-Mail Removed)> wrote in message
> > news:(E-Mail Removed)...
> > > I tried this VB.NET 2003 (.Net runtime 1.1):
> > >
> > > Dim o As Object = DirectCast(Nothing, HashTable)
> > > If IsNothing(o) Then
> > > Debug.WriteLine("Nothing")
> > > Else
> > > Debug.WriteLine("Something")
> > > End If
> > >
> > > Guess what: o is not Nothing!
> > > Is this a bug or a feature? By the way: CType(Nothing, HashTable)
> returns
> > > Nothing as I would expect.
> > >
> > > Guido
> > >
> > >
> >
> >
>
>
>

Hi Guido,
Dim o As Object = DirectCast(Nothing, Hashtable)
Dim m As Object = CType(Nothing, Hashtable)
If m Is o Then
MessageBox.Show("both the same")
End If

both the same is showed (and they are nothing)

Cor

Hi Bill,

you are right.
DirectCast(Nothing, Hashtable) Is Nothing correctly returns Nothing and the
example I gave also works correctly. However, the watch window and the
variable tooltips obviously have a problem because they display {Length = 0}
instead of Nothing.

Guido

"Bill McCarthy <no spam>" <bill_mcc &#64; iprimus.com.au> schrieb im
Newsbeitrag news:(E-Mail Removed)...
> Hi Guido,
>
> Yeh, I get the same in the watch window, but I still get the result to be
> Nothing when actually run:
> e.g:
>
> Console.Writeline( DirectCast(Nothing, Hashtable) Is Nothing)
>
> returns True.
>
> What does your watch window say for :
> DirectCast(Nothing, Hashtable) Is Nothing
>
>
>
>
> "Guido Kraus" <(E-Mail Removed)> wrote in message
> news:OE%(E-Mail Removed)...
> > Hi Bill,
> >
> > I made a screenshot of my Watch window (I have the German version of
VS.NET
> > but I everybody will understand it).
> >
> > Guido
> >
> > "Bill McCarthy <no spam>" <bill_mcc &#64; iprimus.com.au> schrieb im
> > Newsbeitrag news:e6$$(E-Mail Removed)...
> > > hi Guido,
> > >
> > > recheck your code. I tested it and cannot reproduce. I get o is
Nothing.
> > >
> > >
> > > Bill.
> > >
> > >
> > > "Guido Kraus" <(E-Mail Removed)> wrote in message
> > > news:(E-Mail Removed)...
> > > > I tried this VB.NET 2003 (.Net runtime 1.1):
> > > >
> > > > Dim o As Object = DirectCast(Nothing, HashTable)
> > > > If IsNothing(o) Then
> > > > Debug.WriteLine("Nothing")
> > > > Else
> > > > Debug.WriteLine("Something")
> > > > End If
> > > >
> > > > Guess what: o is not Nothing!
> > > > Is this a bug or a feature? By the way: CType(Nothing, HashTable)
> > returns
> > > > Nothing as I would expect.
> > > >
> > > > Guido
> > > >
> > > >
> > >
> > >
> >
> >
> >
>
>

Guido,

I remember me that shortly ago Jay B. Harlow has told something about this
windows

I found the article here

http://tinyurl.com/2lrb4

Cor

* "Guido Kraus" <(E-Mail Removed)> scripsit:
> you are right.
> DirectCast(Nothing, Hashtable) Is Nothing correctly returns Nothing and the
> example I gave also works correctly. However, the watch window and the
> variable tooltips obviously have a problem because they display {Length = 0}
> instead of Nothing.

Yep. The watch window and the tooltips don't always show the right
data.

--
Herfried K. Wagner [MVP]
<URL:http://dotnet.mvps.org/>