Splitting a string into chunks of a certain size

Question

Suppose I had a string:

string str = \"1111222233334444\"; 

How can I break this string into chunks of some size?

e.g., breaking t

Answer 1

Modified (now it accepts any non null string and any positive chunkSize) Konstantin Spirin's solution:

public static IEnumerable Split(String value, int chunkSize) {
  if (null == value)
    throw new ArgumentNullException("value");
  else if (chunkSize <= 0)
    throw new ArgumentOutOfRangeException("chunkSize", "Chunk size should be positive");

  return Enumerable
    .Range(0, value.Length / chunkSize + ((value.Length % chunkSize) == 0 ? 0 : 1))
    .Select(index => (index + 1) * chunkSize < value.Length 
      ? value.Substring(index * chunkSize, chunkSize)
      : value.Substring(index * chunkSize));
}

Tests:

  String source = @"ABCDEF";

  // "ABCD,EF"
  String test1 = String.Join(",", Split(source, 4));
  // "AB,CD,EF"
  String test2 = String.Join(",", Split(source, 2));
  // "ABCDEF"
  String test3 = String.Join(",", Split(source, 123));