Easiest methods for copying and removing +elements+ of one ArrayList to/from another?

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kenfine@nospam.nospam - 17 Nov 2006 19:12 GMT

I have three Arraylists that hold strings corresponding to addresses of an
e-mail list:

ArrayList masterList
ArrayList optInToMasterList
ArrayList optOutFromMasterList

I want to know the easiest way to add all of the +contents+ of one arraylist
to another.

masterList.CopyTo (optInToMasterList) does not have the intended effect: I
end up with an array nested in an array, which is quite logical, but it
isn't what I want.

optInToMasterList.Remove(optOutFromMasterList) does not seem to work either.

I'm sure I could figure out how to .Add and .Remove what I want to using
looping structures, but I would be happiest if there's already an inbuilt
method in the Framework to help me out.

Can you help?

Thank you,
-KF

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gary@garyshort.org - 17 Nov 2006 20:17 GMT

Is this the sort of thing you are looking for?

ArrayList AL1 = new ArrayList(3);
ArrayList AL2 = new ArrayList(3);
ArrayList AL3 = new ArrayList(6);

//Fill an arraylist with strings
AL1.Add("One");
AL1.Add("Two");
AL1.Add("Three");

//Fill another arraylist with strings
AL2.Add("Four");
AL2.Add("Five");
AL2.Add("Six");

//Combine the two arraylists into a third list
AL3.AddRange(AL1);
AL3.AddRange(AL2);

--
Cheers,
Gary
http://www.garyshort.org/

> I have three Arraylists that hold strings corresponding to addresses of an
> e-mail list:
[quoted text clipped - 20 lines]
> Thank you,
> -KF

Reply to this Message

Peter Bromberg [C# MVP] - 17 Nov 2006 20:19 GMT

Sometimes the brute force method will save you a lot of time, especially if
it doesn't involve a lot of code (pseudocode here):

for(int i=0;i<optIntoMasterList.Length;i++)
masterList.Add(optIntoMasterList[i]);

Cheers
Peter

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> I have three Arraylists that hold strings corresponding to addresses of an
> e-mail list:
[quoted text clipped - 20 lines]
> Thank you,
> -KF

Reply to this Message

kenfine@nospam.nospam - 17 Nov 2006 20:58 GMT

Thanks to both of you. My application now works great and I know a lot more
about the ArrayLists's methods.

ArrayList newbies who discover this e-mail thread should note that the
ArrayList equivalent of the .Length property is ".Count".

-KF

> Sometimes the brute force method will save you a lot of time, especially
> if
[quoted text clipped - 34 lines]
>> Thank you,
>> -KF

Reply to this Message

Kevin Yu [MSFT] - 20 Nov 2006 02:18 GMT

Hi KF,

I agree with Peter. You can also use foreach statement for the loop.

Kevin Yu
Microsoft Online Community Support

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Easiest methods for copying and removing +elements+ of one ArrayList to/from another?

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