How to resize an array in CSharp

Question

4.00/5 (2 votes)

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I have code as follow:

Dim aRead() As String
      Dim  nCnt,i As Iteger  
      nCnt = 0
      For i=0 to 5               
         ReDim Preserve aRead(nCnt)                           
         aRead(nCnt) = i
      Next i
      nCnt = nCnt + 1

and now I want to convert it to C#, so How must I do?
I tried as below but not:

int i,nCnt = 0;
string[] aRead = null;
For(i=0;i<=5;i++){
Array.Resize(ref aRead, nCnt);
aRead[nCnt] = i;
nCnt = nCnt + 1;
}

could you help me please.
thanks.

Posted 17-Feb-11 14:20pm

ngthtra

Updated 17-Feb-11 14:34pm

Henry Minute

v3

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3 solutions

Solution 3

I use for from 0 to 5 to for example and the problem in here is I can not riseze array in loop.Because when I debug it the first run it is resized ok but the second has bug.
I think that in C# it do not allow we risize array in loop as in VB. Maybe I must count the time loop and then resize my array and this way is ok.

Posted 18-Feb-11 21:09pm

ngthtra

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Nish Nishant · Accepted Answer · 2011-02-17T14:24:00

Solution 1

The closest C# equivalent is Array.Resize<T> but even that creates a new array and copies over the old array into the new array.

If you want an array-like collection that can grow as required, use List<T>. That would be a more .NET-ish way of doing things.

When moving from classic VB to .NET, it's not enough to learn the new syntax, you also need to understand the new framework and try and follow recommended .NET practices.

Posted 17-Feb-11 14:24pm

Nish Nishant

Updated 17-Feb-11 14:27pm

v4

Comments

Henry Minute 17-Feb-11 20:32pm

Good answer.

Nish Nishant 17-Feb-11 20:34pm

Thanks Henry!

Sergey Alexandrovich Kryukov 17-Feb-11 20:33pm

All correct, my 5.
--SA

Nish Nishant 17-Feb-11 20:34pm

Thanks SA.

fjdiewornncalwe 17-Feb-11 22:59pm

Agreed! +5

Yusuf · Accepted Answer · 2011-02-17T14:36:00

As Nishant mentioned Array.Resize will do it. But it is expensive operation as each call will create a new array.

Alternatively, you know from your code above your array size ahead of time. So you don't need to Resize it in the loop, rather have it defined once and you are done.

C#

int i;
string[] aRead = new string[5];
for(i=0;i<=5;i++){
 aRead[i] = i;
}

Alternative 2: If you think you will need to grow your array then use ArrayList[^]

ArrayList myAL = new ArrayList();
for(i=0;i<=5;i++){
      myAL.Add(i);
}