如何在Split（''）上使用Empty文字

Question

I need to read a string with non-space separated values (0-9). Why can't I use Empty literal in String.Split method?

// Reading Grid's row and col size
gridInputValues = Console.ReadLine().Split(' ');
gridRow = int.Parse(gridInputValues[0]);
gridCol = int.Parse(gridInputValues[1]);
gridMatrix2D = new int[gridRow, gridCol];
// Reading Grid's row * col matrix values
for( int r = 0; r < gridRow; r++ ) 
{
    //string[] inputVal = Console.ReadLine().Split('');
    //string[] inputVal = Console.ReadLine().Split(string.Empty));
    string inputVal = Console.ReadLine();
    for( int c = 0; c < gridCol; c++ ) 
    {
        //gridMatrix2D[r, c] = int.Parse(inputVal[c]);
        gridMatrix2D[r, c] = int.Parse(inputVal[c].ToString());
    }

Why not,

string[] inputVal = Console.ReadLine().Split('');

or

string[] inputVal = Console.ReadLine().Split(string.Empty));

works?

Alternatively, Is using string.ToString good practice in such case?

or

Will the string.ToString method on each iteration increase the running time?

EDIT 1:

Input:

 "12345" // type is string

Expected Output:

 "1","2","3","4","5" // type is string[]

Answer 1

What about:

Console.ReadLine().ToArray()

You don´t seem to need split the string, you just want the individual characters.

or String.ToCharArray as @Tim Schmelter correctly pointed out.

Answer 2

You can probably try this

string[] inputVal = Console.ReadLine().Split(null);

or

string[] inputVal = Console.ReadLine().Split(new char[0], StringSplitOptions.RemoveEmptyEntries)

Answer 3

您可以改用chars：

int[] intArray = inputVal.Select(ch => ch-'0').ToArray();