How do I find the size of a 2D array? [duplicate]

问题

This question already has answers here:

How do you get the width and height of a multi-dimensional array? (5 answers)

Closed last year.

If I declare this array...

string[,] a = {
                  {"0", "1", "2"},
                  {"0", "1", "2"},
                  {"0", "1", "2"},
                  {"0", "1", "2"},
              };

Then I can measure the length with

a.Length

which is 12. How do I measure the dimension of the arrays within? If I try...

a[0].Length

I get Wrong number of indices inside []; expected 2. What gives?

回答1:

You want the GetLength() method of your array:

a.GetLength(0);

http://msdn.microsoft.com/en-us/library/system.array.getlength.aspx

回答2:

Use Array.Rank to get number of dimensions and then use Array.GetLength(int dimension) to get the length of a specific dimension.

回答3:

Use System.Array.GetLength(int dimension).

来源：https://stackoverflow.com/questions/4106369/how-do-i-find-the-size-of-a-2d-array