Adding elements to a C# array

Question

I would like to programmatically add or remove some elements to a string array in C#, but still keeping the items I had before, a bit like the VB function ReDim Preserve.

Answer 1

If you really won't (or can't) use a generic collection instead of your array, Array.Resize is c#'s version of redim preserve:

var  oldA = new [] {1,2,3,4};
Array.Resize(ref oldA,10);
foreach(var i in oldA) Console.WriteLine(i); //1 2 3 4 0 0 0 0 0 0

Answer 2

Since arrays implement IEnumerable<T> you can use Concat:

string[] strArr = { "foo", "bar" };
strArr = strArr.Concat(new string[] { "something", "new" });

Or what would be more appropriate would be to use a collection type that supports inline manipulation.

Answer 3

You should take a look at the List object. Lists tend to be better at changing dynamically like you want. Arrays not so much...

Answer 4

You can use this snippet:

static void Main(string[] args)
{



        Console.WriteLine("Enter number:");
        int fnum = 0;
        bool chek = Int32.TryParse(Console.ReadLine(),out fnum);            


        Console.WriteLine("Enter number:");
        int snum = 0;
        chek = Int32.TryParse(Console.ReadLine(),out snum);


        Console.WriteLine("Enter number:");
        int thnum = 0;
        chek = Int32.TryParse(Console.ReadLine(),out thnum);


        int[] arr = AddToArr(fnum,snum,thnum);

        IOrderedEnumerable<int> oarr = arr.OrderBy(delegate(int s)
        {  
            return s;
        });


        Console.WriteLine("Here your result:");


        oarr.ToList().FindAll(delegate(int num) {

            Console.WriteLine(num);

            return num > 0;

        });



}



public static int[] AddToArr(params int[] arr) {

    return arr;
}

I hope this will help to you, just change the type