How to shift the start of an array in C#?

Question

I\'m trying to reorganize an array based on the first occurrence of a value (thus simulating similar functionality to a circular array.)

For example, in the followin

Answer 1

New approach that will only work with .NET 4.5 (from 2012) or later:

  const int value = 6;
  int[] myArray = { 2, 3, 6, 1, 7, 6, };

  var index = Array.IndexOf(myArray, value);
  if (index == -1)
    throw new InvalidOperationException();

  var rotatedArray = (new ArraySegment(myArray, index, myArray.Length - index))
    .Concat(new ArraySegment(myArray, 0, index))
    .ToArray();

In earlier .NET versions, an ArraySegment<> value could not be used as an IEnumerable<> like that.

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Not clear to me if it was a requirement that the original array instance be mutated, but if you need that, simply append:

  rotatedArray.CopyTo(myArray, 0);

to my code.