Clearing two-dimensional array

Question

I am using a two-dimensional array of 10 elements, but my code is extremely slow.

Dim myArray As String(,) 
For i=0 to 100
   'Clear Array. (This line is really slow)
   myArray = New String(,) {{"", ""}, {"", ""}, {"", ""}, _
   {"", ""}, {"", ""}, {"", ""}, {"", ""}, {"", ""}, {"", ""}, {"", ""}}

   'Populate array
   fillArray(myArray) 

   'Do stuff with array
   useArray(myArray)
Next i

I create a new empty array with every iteration of the for loop. Is there a way I can use the same array but just clear it instead?

AJ. · Accepted Answer · 2011-02-25 13:45:22Z

3

It's unclear what you're using your array for, but you might want to look into using a collection instead.

As far as clearing the array is concerned, look into using Array.Clear.

answered Feb 25, 2011 at 13:45

AJ.

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3 Comments

cHao Over a year ago

Note, though, that Array.Clear will set the elements to their default value -- which, in the case of strings, is Nothing (null for the C# folks).

Urbycoz Over a year ago

The array gets populated and then its contents gets read elsewhere. That bit's not important though. I'm just illustrating the point that I need to clear the array whilst keeping its structure.

Urbycoz Over a year ago

What's the advantage of collections over arrays?

Aesphere · Accepted Answer · 2011-02-25 14:00:45Z

1

Doesn't vb.net have a way to quickly create 2 dimensional arrays? It was something like:

Dim rectArray(10, 10) As String

Then you can populate as usual:

Dim rectArray(,) As String = {{'', '', '' ....etc

some reading that might help - link

answered Feb 25, 2011 at 14:00

Aesphere

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1 Comment

Urbycoz Over a year ago

You're so right! After a bit of research it turns out the syntax is actually arr = New String(9, 1) {}. Thank you!

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