Is there anything obvious wrong with this little loop? The second statement
throws an exception "Enumeratio n has not started. Call MoveNext." I thought
that is what I did in line one.
My intent here is to take what is left in the queue and write it back to the
text file from which it came so it can survive an upcoming reboot.
Do While myQ.GetEnumerat or.MoveNext
sw = myQ.GetEnumerat or.Current 'sw is a StreamWriter
Loop
9  4171 
"Ty Moffett" <tm******@solar c.com> schrieb Is there anything obvious wrong with this little loop? The second
statement throws an exception "Enumeratio n has not started. Call
MoveNext." I thought that is what I did in line one.
My intent here is to take what is left in the queue and write it back
to the text file from which it came so it can survive an upcoming
reboot.
Do While myQ.GetEnumerat or.MoveNext
sw = myQ.GetEnumerat or.Current 'sw is a StreamWriter
Loop
I guess, each call to GetEnumerator creates a _new_ enumerator. Solution:
dim en as ienuemrator
en = myQ.GetEnumerat or
Do While en.MoveNext
sw = em.Current 'sw is a StreamWriter
Loop
--
Armin
* "Ty Moffett" <tm******@solar c.com> scripsit: Is there anything obvious wrong with this little loop? The second statement
throws an exception "Enumeratio n has not started. Call MoveNext." I thought
that is what I did in line one.
My intent here is to take what is left in the queue and write it back to the
text file from which it came so it can survive an upcoming reboot.
\\\
Dim e As IEnumerator = myQ.GetEnumerat or()
///
Do While myQ.GetEnumerat or.MoveNext
Instead of the line above:
\\\
Do While e.MoveNext()
///
sw = myQ.GetEnumerat or.Current 'sw is a StreamWriter
Use this instead of the line above:
\\\
sw = e.Current
///
Loop
--
Herfried K. Wagner
MVP · VB Classic, VB.NET
<http://www.mvps.org/dotnet>
Thanks a lot fellas. This little app is really coming along.
I did fnd that sw.WriteLine(en .Current) worked like I wanted it too.
Thanks again!
"Herfried K. Wagner [MVP]" <hi************ ***@gmx.at> wrote in message
news:bn******** ****@ID-208219.news.uni-berlin.de... * "Ty Moffett" <tm******@solar c.com> scripsit: Is there anything obvious wrong with this little loop? The second
statement throws an exception "Enumeratio n has not started. Call MoveNext." I
thought that is what I did in line one.
My intent here is to take what is left in the queue and write it back to
the text file from which it came so it can survive an upcoming reboot.
\\\
Dim e As IEnumerator = myQ.GetEnumerat or()
///
Do While myQ.GetEnumerat or.MoveNext
Instead of the line above:
\\\
Do While e.MoveNext()
///
sw = myQ.GetEnumerat or.Current 'sw is a StreamWriter
Use this instead of the line above:
\\\
sw = e.Current
///
Loop
--
Herfried K. Wagner
MVP · VB Classic, VB.NET
<http://www.mvps.org/dotnet>
In article <ub************ **@TK2MSFTNGP10 .phx.gbl>, Armin Zingler wrote: "Ty Moffett" <tm******@solar c.com> schrieb Is there anything obvious wrong with this little loop? The second
statement throws an exception "Enumeratio n has not started. Call
MoveNext." I thought that is what I did in line one.
My intent here is to take what is left in the queue and write it back
to the text file from which it came so it can survive an upcoming
reboot.
Do While myQ.GetEnumerat or.MoveNext
sw = myQ.GetEnumerat or.Current 'sw is a StreamWriter
Loop
I guess, each call to GetEnumerator creates a _new_ enumerator. Solution:
dim en as ienuemrator
en = myQ.GetEnumerat or
Do While en.MoveNext
sw = em.Current 'sw is a StreamWriter
Loop
I have to ask... Why don't you just use a For Each?
Dim q As Queue(New String() {"1", "2", "3", "4", "5"}
For Each s As String In q
Console.WriteLi ne(s)
Next
Unless your trying to actually modify the collection (like calling
Enqueue or Dequeue), that should work fine. And if you are trying to
modify the collection, then you shouldn't use the enumerator anyway
because it's going to throw an exception. In that case, you should just
do something like:
Do While q.Count > 0
s = DirectCast(q.De queue(), String)
Console.WriteLi ne(s)
Loop
--
Tom Shelton
MVP [Visual Basic]
Ty,
Why are using a While loop instead of a For Next?
As Armin stated, each call to GetEnumertor returns a new IEnumerator object,
as you have multiple threads and each thread can be enumerating over the
same collection, or even have a single thread & can be enumerating over the
same collection with multiple IEnumerator variables.
I would recommend you use a For Each:
' VS.NET 2003 syntax
For Each item As Object In myQ
sw.WriteLine(it em)
Next
Hope this helps
Jay
"Ty Moffett" <tm******@solar c.com> wrote in message
news:uu******** ********@TK2MSF TNGP10.phx.gbl. .. Is there anything obvious wrong with this little loop? The second
statement throws an exception "Enumeratio n has not started. Call MoveNext." I
thought that is what I did in line one.
My intent here is to take what is left in the queue and write it back to
the text file from which it came so it can survive an upcoming reboot.
Do While myQ.GetEnumerat or.MoveNext
sw = myQ.GetEnumerat or.Current 'sw is a StreamWriter
Loop
"Tom Shelton" <to*@mtogden.co m> schrieb I guess, each call to GetEnumerator creates a _new_ enumerator.
Solution:
dim en as ienuemrator
en = myQ.GetEnumerat or
Do While en.MoveNext
sw = em.Current 'sw is a StreamWriter
Loop
I have to ask... Why don't you just use a For Each?
Because Ty Moffett also didn't. Of course I could also point him to For
each, but I wanted to show why the error occurs.
--
Armin
On 2003-10-23, Armin Zingler <az*******@free net.de> wrote: "Tom Shelton" <to*@mtogden.co m> schrieb > I guess, each call to GetEnumerator creates a _new_ enumerator.
> Solution:
>
> dim en as ienuemrator
>
> en = myQ.GetEnumerat or
>
> Do While en.MoveNext
> sw = em.Current 'sw is a StreamWriter
> Loop
>
>
I have to ask... Why don't you just use a For Each?
Because Ty Moffett also didn't. Of course I could also point him to For
each, but I wanted to show why the error occurs.
Sorry, Armin... My post was acutally supposed to be attached to Ty's
but I some how muffed it... I realize you were just showing him how it
works. Gosh, that's the second time today that I've felt sheepish. I
think I better take a day off :)
--
Tom Shelton
MVP [Visual Basic]
"Tom Shelton" <to*@mtogden.co m> schrieb Sorry, Armin... My post was acutally supposed to be attached to
Ty's but I some how muffed it... I realize you were just showing him
how it works.
No problem. Happens to everyone now and then. :-)
Gosh, that's the second time today that I've felt
sheepish. I think I better take a day off :)
Sometimes I think we all should take a day off. ;-)
--
Armin
Mainly just out of ignorance. =) I'm going to take your advice and try to
simplify my code.
Thanks a lot for all of you help guys. =)
"Jay B. Harlow [MVP - Outlook]" <Ja********@ema il.msn.com> wrote in message
news:%2******** ********@TK2MSF TNGP09.phx.gbl. .. Ty,
Why are using a While loop instead of a For Next?
As Armin stated, each call to GetEnumertor returns a new IEnumerator
object, as you have multiple threads and each thread can be enumerating over the
same collection, or even have a single thread & can be enumerating over
the same collection with multiple IEnumerator variables.
I would recommend you use a For Each:
' VS.NET 2003 syntax
For Each item As Object In myQ
sw.WriteLine(it em)
Next
Hope this helps
Jay
"Ty Moffett" <tm******@solar c.com> wrote in message
news:uu******** ********@TK2MSF TNGP10.phx.gbl. .. Is there anything obvious wrong with this little loop? The second
statement throws an exception "Enumeratio n has not started. Call MoveNext." I
thought that is what I did in line one.
My intent here is to take what is left in the queue and write it back to
the text file from which it came so it can survive an upcoming reboot.
Do While myQ.GetEnumerat or.MoveNext
sw = myQ.GetEnumerat or.Current 'sw is a StreamWriter
Loop
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