public static PositionTuple FirstPositionOf(this int[,] someTwoDimensionalArray, int someNumber)
{
return(someTwoDimensionalArray
.AsEnumerable()
.Select((num, index) => new { Number = num, Tuple = new PositionTuple {
X = index / (someTwoDimensionalArray.GetUpperBound(1) + 1), Y = index % (someTwoDimensionalArray.GetUpperBound(1) + 1)
} })
.Where(pair => pair.Number == someNumber)
.Select(pair => pair.Tuple)
.First());
}
public void AsEnumerable()
{
int[,] candidate =
{
{ 1, 2, 3, },
{ 4, 5, 6, },
{ 7, 8, 9, },
{ 10, 11, 12, },
};
CollectionAssert.AreEqual(Enumerable.Range(1, 12).ToArray(), candidate.AsEnumerable().ToArray());
}