i'm new to asp.net and i'm writing some code to learn about arraylist
al.Add((string)"asfsaf");
al[1] = "bcd";
al.TrimToSize();
Response.Write(al[1]);
from the above code, the line al[1] = "bcd"; is wrong, is arraylist support insert elements by index? if not, any other data structure can be replaced?
thanks
You can try .Insert() as below:
al.Insert(1, "bcd");
EDIT: You can't directly insert based on an index in a List, you can only Set(Modify)/Get a value to an index. If it exists
You can use indexing with an ArrayList as well, but use a Generic List instead of ArrayList. Its type safe. and Also support insertion based on index.
With ArrayList you can use the index
List<string> list = new List<string>();
list.Add("first element");
list.Add("2nd element");
Console.Write(list[0]);
Console.Write(list[1]);
list[0] = "AAA - element"; //In actual its a modification,
//if there is no element, there will b exception
list[1] = "BBB - element";
Remember you can't directly set element of a list based on an index.
al[1] needs to be created before you can use it via the indexer.
al[1] = "bcd"; will result in an exception of ArgumentOutOfRangeException.
Remember array indexes start from zero.
If you want to overwrite it, it should be like this.
al[0] = "bcd";
