Re: C# Question

  • From: "Ricks Place" <OFBGMail@xxxxxxxxx>
  • To: <programmingblind@xxxxxxxxxxxxx>
  • Date: Sun, 30 Mar 2008 16:14:38 -0400

I'm back for a second, an Arraylist is only one dimensional if I remember. I'll do a little googling on another computer while I do some background work on this one and see if I can find something. You want to put what exactly into your array? Are you trying to store indexed elemental datatypes or are you wanting to store objects? Are you trying to store instances of the class itself? 

Rick USA
----- Original Message ----- From: "Chris Hofstader" <chris.hofstader@xxxxxxxxxxx> 
To: <programmingblind@xxxxxxxxxxxxx>
Sent: Sunday, March 30, 2008 3:15 PM
Subject: RE: C# Question



Thanks Rick,

Sina had most of the answer and I just found an article online on some
programming site that told me to use an ArrayList instead of an Array and
all of my problems should be solved. I haven't looked at the documentation 
on ArrayList yet and haven't given it a try yet.

cdh

-----Original Message-----
From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Ricks Place
Sent: Sunday, March 30, 2008 3:09 PM
To: programmingblind@xxxxxxxxxxxxx
Subject: Re: C# Question

I'm not sure about auto sizing arrays. I thought they would resize too but
not worked in C# in 3 or so years. If you know the max size and it's not
huge you could just set the max size in each dimension for initial testing
to make sure everything else is working like the instantiation. I have to do
some things but will be back in awhile and see if I can dig something up. I have never assigned class objects, just int and strings to arrays in the old 

days but I don't see why objects would be diferent.
Also, it seems i remember the c# syntax using the variable type in the first 

position of a definition.
int MyArray[][]; Or something like that.
Sorry I can't dig into it right now but look for an array definition using
an object Data type.
I'll be back later today to help if I can.
Sina may have had the answer, over my head but he is really advanced.
Rick USA
----- Original Message ----- From: "Chris Hofstader" <chris.hofstader@xxxxxxxxxxx> 
To: <programmingblind@xxxxxxxxxxxxx>
Sent: Sunday, March 30, 2008 2:59 PM
Subject: RE: C# Question
This is my first venture into multidimensional C# arrays. Prior to Sina's 
message I thought they grew as needed but that seems to have been a false
assumption.  I've been digging through documentation and learned that my
initial declaration was indeed wrong. The "dataTable" in my example isn't 
from my code and was only meant to act as an illustration.

So, if arrays do not resize dynamically, how can I start with a table of
unknown number of rows and columns and store them in an array?

Thanks,
cdh

-----Original Message-----
From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Ricks Place
Sent: Sunday, March 30, 2008 2:53 PM
To: programmingblind@xxxxxxxxxxxxx
Subject: Re: C# Question

Hi Chris:
How adept are you with C# Arrays? I ask because the format of the
definition
just looks wierd somehow, not looked at C# in a long time. Also, dataTable 
might be treading on the DataTable keyword or the array was not
instantiated.
If you  are adept at using C# arrays I'll guess it is something I've just
not encountered, assigning objects in an array. Otherwise I'll dig into
the
docs for Arrays and see if I can find anything.
Rick USA
----- Original Message ----- From: "Chris Hofstader" <chris.hofstader@xxxxxxxxxxx> 
To: <programmingblind@xxxxxxxxxxxxx>
Sent: Sunday, March 30, 2008 2:26 PM
Subject: C# Question



Hi,
I have a class which, for purposes of illustration, I'll call MyClass. I want to declare a two dimensional array of this class so I can have a set 
of
rows and columns within.  I don't know the ultimate size of the array so
I
declare it with empty brackets.

For instance:

MyArray[][] dataTable;  // This compiles without error

but, in the code, if I state:

dataTable[0][0] = new MyClass();

I get an exception about a NULL assignment when the code is executed.
I had thought that .Net arrays declared without the "fixed" keyword would 
grow dynamically and that the Array type overloaded the brackets to
ensure
the sort of exception I'm getting doesn't happen.
Obviously, I'm doing something quite wrong but I'm having trouble finding 
examples of C# arrays of anything more complex than int or String.

Please help.

Thanks,
cdh

Chris Hofstader
CUNY, BSO, ATG, Odds and Ends
email: cdh@xxxxxxxxxxxxx
Blog: http://www.blindconfidential.blogspot.com
Skype: BlindChristian
phone: 727-896-6393



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