C# – Copy one string array to another


How can I copy a string[] from another string[]?

Suppose I have string[] args. How can I copy it to another array string[] args1?

Best Solution

  • To create a completely new array with the same contents (as a shallow copy): call Array.Clone and just cast the result.
  • To copy a portion of a string array into another string array: call Array.Copy or Array.CopyTo

For example:

using System;

class Test
    static void Main(string[] args)
        // Clone the whole array
        string[] args2 = (string[]) args.Clone();

        // Copy the five elements with indexes 2-6
        // from args into args3, stating from
        // index 2 of args3.
        string[] args3 = new string[5];
        Array.Copy(args, 2, args3, 0, 5);

        // Copy whole of args into args4, starting from
        // index 2 (of args4)
        string[] args4 = new string[args.Length+2];
        args.CopyTo(args4, 2);

Assuming we start off with args = { "a", "b", "c", "d", "e", "f", "g", "h" } the results are:

args2 = { "a", "b", "c", "d", "e", "f", "g", "h" }
args3 = { "c", "d", "e", "f", "g" }
args4 = { null, null, "a", "b", "c", "d", "e", "f", "g", "h" }