Arguments of GetLength()

Question

What does the Arguments of GetLength mean? for example

value.GetLength(1)

where value is a two dimensional Array double[,] What will changing 0 and 1 differ in?

Answer 1

The argument for GetLength method specifies the dimension. The method returns the number of elements in the specified dimension. Example with a two dimensional array:

class Program
{
    static void Main()
    {
        var a = new int[5, 4];
        Console.WriteLine(a.GetLength(0));
        Console.WriteLine(a.GetLength(1));
    }
}

prints 5 and 4 on the screen.

Answer 2

GetLength(i) returns the number of elements in the ith dimension. So for a two-dimensional array GetLength(0) returns the number of rows and GetLength(1) returns the number of columns.