I have worked on this for a while and have not been able to get it working.
I seem to be missing something. What I am attempting to do is get
information from a csv file such as: name (stirng), unit number (int),
address (int), value (int), etc. I created a structre to handle each
element. Since there is an unknown number of rows I have used an arraylist
to hold it. This works using the arraylist.add(s tructure).
The problem is that after loading I get information from an external device
tied to the serial port. As this information is recieved I would like to
update the value element in the arraylist. I did this in VB6 by using a UDT
the dynamic arrays. I have read that this should not be done in VB.NET, to
use the arraylist instead.
Any help would be greatly appriciated.
Thanks
wg
8  6638 
On 2005-06-26, wg <wg@hotmail.com > wrote: I have worked on this for a while and have not been able to get it working.
I seem to be missing something. What I am attempting to do is get
information from a csv file such as: name (stirng), unit number (int),
address (int), value (int), etc. I created a structre to handle each
element. Since there is an unknown number of rows I have used an arraylist
to hold it. This works using the arraylist.add(s tructure).
The problem is that after loading I get information from an external device
tied to the serial port. As this information is recieved I would like to
update the value element in the arraylist. I did this in VB6 by using a UDT
the dynamic arrays. I have read that this should not be done in VB.NET, to
use the arraylist instead.
Any help would be greatly appriciated.
Thanks
wg
wg... use a class in an arraylist. Using a structure can be made to
work, but it is very inefficent.
--
Tom Shelton [MVP]
Hi,
Directcast(arra ylist.item(numb er), YourStructureNa me).value = NewValue
Ken
-----------------
"wg" <wg@hotmail.com > wrote in message
news:oR******** ********@bignew s4.bellsouth.ne t...
I have worked on this for a while and have not been able to get it working.
I seem to be missing something. What I am attempting to do is get
information from a csv file such as: name (stirng), unit number (int),
address (int), value (int), etc. I created a structre to handle each
element. Since there is an unknown number of rows I have used an arraylist
to hold it. This works using the arraylist.add(s tructure).
The problem is that after loading I get information from an external device
tied to the serial port. As this information is recieved I would like to
update the value element in the arraylist. I did this in VB6 by using a UDT
the dynamic arrays. I have read that this should not be done in VB.NET, to
use the arraylist instead.
Any help would be greatly appriciated.
Thanks
wg
"wg" <wg@hotmail.com > schrieb I have worked on this for a while and have not been able to get it
working. I seem to be missing something. What I am attempting to do
is get information from a csv file such as: name (stirng), unit
number (int), address (int), value (int), etc. I created a structre
to handle each element. Since there is an unknown number of rows I
have used an arraylist to hold it. This works using the
arraylist.add(s tructure).
The problem is that after loading I get information from an external
device tied to the serial port. As this information is recieved I
would like to update the value element in the arraylist. I did this
in VB6 by using a UDT the dynamic arrays. I have read that this
should not be done in VB.NET, to use the arraylist instead.
Value types added to an arraylist can not be changed. Retrieving the Item
always retruns a copy because it's a value type. As Tom wrote, use a class
instead.
Armin
"Ken Tucker [MVP]" <vb***@bellsout h.net> schrieb Directcast(arra ylist.item(numb er), YourStructureNa me).value =
NewValue
Doesn't work because the returned value is a value type.
Armin
"Armin Zingler" <az*******@free net.de> schrieb: Directcast(arra ylist.item(numb er), YourStructureNa me).value =
NewValue
Doesn't work because the returned value is a value type.
You'll have to reassign the value to the item after changingt the copy, or
use a class instead of the structure ;-).
--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>
I have attempted to use a class in the beginning but could never get it to
work right. Could someone give a quick example?
Thanks
wg
"wg" <wg@hotmail.com > wrote in message
news:oR******** ********@bignew s4.bellsouth.ne t... I have worked on this for a while and have not been able to get it working.
I seem to be missing something. What I am attempting to do is get
information from a csv file such as: name (stirng), unit number (int),
address (int), value (int), etc. I created a structre to handle each
element. Since there is an unknown number of rows I have used an arraylist
to hold it. This works using the arraylist.add(s tructure).
The problem is that after loading I get information from an external
device tied to the serial port. As this information is recieved I would
like to update the value element in the arraylist. I did this in VB6 by
using a UDT the dynamic arrays. I have read that this should not be done
in VB.NET, to use the arraylist instead.
Any help would be greatly appriciated.
Thanks
wg
Thanks for the tip Cor. I assume the row delimiter is a \ or can be anything
that the FMT=Delimited* is set to like the *. Is this correct?
--
Dennis in Houston
"Cor Ligthert" wrote: WG,
You know that with OleDb you can in one time from a CSV make a dataset?
See this sample on our site
http://www.windowsformsdatagridhelp....f-212f9e0de193
I hope this helps,
Cor
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