Re: ArrayList stored in DataSet? (What can & Cant be stored?)

If you're trying to persist objects to a file, then you could always try
this, http://www.google.com/search?q=serialize+objects+to+file+c%23.

--ola 

-----Original Message-----
From: Discussion relating to the specifics of the C# and Managed C++
languages [mailto:DOTNET-CX@xxxxxxxxxxxxxxxxxxx] On Behalf Of Ola
Tinoco-Ekdahl
Sent: Tuesday, September 20, 2005 2:41 PM
To: DOTNET-CX@xxxxxxxxxxxxxxxxxxx
Subject: Re: [DOTNET-CX] ArrayList stored in DataSet? (What can & Cant
be stored?)

What's the error? Some type of casting mismatch?

--ola

-----Original Message-----
From: Discussion relating to the specifics of the C# and Managed C++
languages [mailto:DOTNET-CX@xxxxxxxxxxxxxxxxxxx] On Behalf Of Zeusbwr
Sent: Tuesday, September 20, 2005 2:32 PM
To: DOTNET-CX@xxxxxxxxxxxxxxxxxxx
Subject: Re: [DOTNET-CX] ArrayList stored in DataSet? (What can & Cant
be stored?)

I'm just trying to save some time so i don't have to convert it to a
set of columns that each hold a value and essentially an object of the
array list.

I haven't toyed with hash tables in C# so i wouldn't know.


As far as the purist face. I wasn't saying THIS STUPID POS DOESN'T
WORK LIKE ITS DESIGNED TO, i was asking if it was designed to be used
that way or not, if it was then apparently i was doing something
wrong. Then again, i shouldn't be dumb enough to ask a silly "does
this do that" question.

So Thanks.. i think.


Short answer, nope, i gatta split my ArrayList/Array up before storing
it.

Thanks!

On 9/20/05, Steve Welborn <swelborn2001@xxxxxxxxx> wrote:
> What is your goal here?
> 
> From looking at your info so far it would seem to be
> easier to use a
> HashTable and put the arraylist inside of it.
> Depending on what your trying
> to do of course.
> 
> Steve
> 
> -----Original Message-----
> From: Discussion relating to the specifics of the C#
> and Managed C++
> languages [mailto:DOTNET-CX@xxxxxxxxxxxxxxxxxxx] On
> Behalf Of Zeusbwr
> Sent: Tuesday, September 20, 2005 12:05 PM
> To: DOTNET-CX@xxxxxxxxxxxxxxxxxxx
> Subject: [DOTNET-CX] ArrayList stored in DataSet?
> (What can & Cant be
> stored?)
> 
> Well i have a DataSet that holds user information. One
> of this set of
> 
> info being (well many hopefully) a form of Array.
> 
> 
> 
> Now Array list start off fine, but when i actually
> assign and save
> 
> data to text, it is deleted it seems.. so either i am
> doing it wrong
> 
> or its not possible to save an ArrayList on a DataSet.
> 
> 
> 
> Is this the proper method to assign a data set? Then
> call it? And if
> 
> so, is there a special save flag or something? because
> as said, mine
> 
> isn't working..
> 
> 
> 
> // Retrieve the Array
> 
>         System.Collections.ArrayList alInv =
> 
> (System.Collections.ArrayList)drUser[0]["SomeData"];
> 
> // Add to the Array
> 
>         alData.Add( "blah" );
> 
>         alData.Add( "blah2" );
> 
> // Put the Array back in the DataSet
> 
>         drUser[0]["SomeData"] = alData;
> 
> // Pull it back out again (to act as if alData didnt
> exist)
> 
>         System.Collections.ArrayList alData2 =
> 
> (System.Collections.ArrayList)drUser[0]["SomeData"];
> 
> // Check the elements, there should be 2. It works for
> me.
> 
>         MessageBox.Show( "This works, here is the number of
> elements: "+
> 
> alData2.Count );
> 
> // Here is where it goes wrong
> 
>         this.dsUsers.WriteXml( "filename.db",
> System.Data.XmlWriteMode.WriteSchema
> 
> 
> 
> Now if you were to reload the dataset and try all that
> again, noting
> 
> that the first thing you do is try and pull the
> ArrayList from the
> 
> DataSet to use it, you would get an error (least i
> do).
> 
> 
> 
> And upon examining the actual XML File that holds the
> DataSet, you get
> 
> this for the ArrayList Row's Column (or w/e).
> 
> 
> 
> <SomeData>System.Collections.ArrayList</SomeData>
> 
> 
> 
> 
> 
> So yea.. I'm doing something wrong i hope. The ability
> to physically
> 
> save objects, and arrays of objects would vastly help
> me. Please give
> 
> me some idea of what I'm doing wrong.. if its even
> possible... :/
> 
> 
> 
> 
> 
> --
> 
> Zeusbwr[at]gmail.com,
> 
> http://www.google.com/talk/
> 
> 
> 
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> 
> 
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-- 
Zeusbwr[at]gmail.com,
http://www.google.com/talk/

Project Blog: http://zeusbwr.blogspot.com/

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