How we change array size in vb.net

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I declared Dim arr1(2) as string

I need to change array size based on some input.

Eg. I want to change array size from 2 to 4, what method would I need to use?

Posted 4-Jul-11 20:36pm

Nathansathya

Updated 4-Jul-11 20:49pm

Dalek Dave

v2

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Dalek Dave 5-Jul-11 2:49am

Edited for Grammar, Syntax and Readability.

5 solutions

Solution 5

Arrays are poorly designed for re-size. Instead, if you need anything with variable size, always use System.Collections.Generic.List<string> (or any other element type); you can get back to array using its method ToArray.

—SA

Posted 4-Jul-11 21:46pm

Sergey Alexandrovich Kryukov

Comments

Abhinav S 5-Jul-11 3:53am

Good advice. my 5.

Sergey Alexandrovich Kryukov 5-Jul-11 4:07am

Thank you, Abhinav.
--SA

Simon_Whale 5-Jul-11 8:15am

sound advice +5

Sergey Alexandrovich Kryukov 5-Jul-11 12:55pm

Thank you, Simon.
--SA

Solution 1

Hello,

define a static variable count and the define your array with count set the count's value that will be your array size.

Hoping it will help you
Thanks
sanjeev

Posted 4-Jul-11 20:39pm

SanjeevSingh

Comments

Nathansathya 5-Jul-11 2:45am

thanks sanjeev........

Dalek Dave 5-Jul-11 2:50am

Helpful.

[no name] 5-Jul-11 2:51am

thanks Dave

Solution 4

you can use 'ReDim Preserve' keyword

suppose you have declared Dim arr1(2) as string, and now you can increase size of arr1 then you can use 'redim preserve' like this

'ReDim Preserve arr1(8)'

for more information aabout Redim statement you can visit
http://www.authorcode.com/redim-statement-of-array-in-vb-net/[^]

Posted 4-Jul-11 21:11pm

hirendra_sisodiya

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Abhinav S · Accepted Answer · 2011-07-04T20:40:00

Solution 2

Try Array.Resize(arr1, 4).

Posted 4-Jul-11 20:40pm

Abhinav S

Comments

Nathansathya 5-Jul-11 2:45am

Tks lot Abinav its works......

Abhinav S 5-Jul-11 2:52am

You are welcome.

You might want to read about the preserve keyword as well.

Dalek Dave 5-Jul-11 2:50am

That is how I would do it.

Abhinav S 5-Jul-11 2:52am

Thanks DD.

Toniyo Jackson 5-Jul-11 2:59am

This also correct +5

Abhinav S 5-Jul-11 3:04am

Thanks.

Sergey Alexandrovich Kryukov 5-Jul-11 3:48am

Correct, works but not recommended. OP should use generic list and return array when done. So, I voted 4.
Please see my solution.
--SA

Sahu.Ashok · Accepted Answer · 2011-07-04T20:44:00

Solution 3

Redim arr1(4) as string
' if u r trieng to preserve previous data than 
Redim preserve arr1(4) as string

Posted 4-Jul-11 20:44pm

Sahu.Ashok

Comments

Nathansathya 5-Jul-11 2:45am

tks sahu........

Toniyo Jackson 5-Jul-11 2:49am

Good answer +5

Dalek Dave 5-Jul-11 2:49am

Good Call.

Abhinav S 5-Jul-11 2:52am

Thanks DD.

Sahu.Ashok 5-Jul-11 3:19am

Thanks Tonyo, Dave and welcome Abhinav & Nathansathys