How to initialize array dynamically?

[Brett]

I need an array but don't know how many items will go into it upon
declaration.

int ArrayIndex = 0;
string[] linkArray = new string[]{};

for (int i = 0; i < Links.Count; i++)
{
linkArray[ArrayIndex] = u.AbsoluteUri;
ArrayIndex++;
}

The first time through the loop, I get an out of bounds error. How exactly
does the array need to work in this case?

Thanks,
Brett

[Alan Pretre]

"Brett" <[e-mail]> wrote in message
news:ul*************@TK2MSFTNGP15.phx.gbl...

I need an array but don't know how many items will go into it upon
declaration.

Hi. Use an ArrayList instead.

System.Collections.ArrayList linkArrayList = new
System.Collections.ArrayList();
for (int i = 0; i < Links.Count; i++) linkArrayList.Add(u.AbsoluteUri);
string[] linkArray = (string[]) linkArrayList.ToArray(typeof(string));

-- Alan

[Jon Skeet [C# MVP]]

Brett <[e-mail]> wrote:

I need an array but don't know how many items will go into it upon
declaration.

int ArrayIndex = 0;
string[] linkArray = new string[]{};

for (int i = 0; i < Links.Count; i++)
{
linkArray[ArrayIndex] = u.AbsoluteUri;
ArrayIndex++;
}

The first time through the loop, I get an out of bounds error. How exactly
does the array need to work in this case?

In this case, it's easy - you *do* know the number of links:

string[] linkArray = new string[Links.Count];

(You don't need the ArrayIndex variable either; just use i.)

If you genuinely don't know ahead of time how many items you need, use
an ArrayList and if you need to, call ToArray on the ArrayList.

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too