如何读取二维数组并将其作为矩阵写入控制台

Question

I wanted to read a 2-D array and write it as a matrix to the console.My code is shown below

//To read the Array

int[][] arr = new int[3][];
for(int i=0;i<3;i++)
{
       arr[i] = Array.ConvertAll(Console.ReadLine().Split(' '),aTemp => Convert.ToInt32(aTemp));
}

//To write the array as matrix to the console

for(int i=0;i<arr.GetLength(0);i++)
            {
                for(int j=0;j<arr.GetLength(1);j++)
                {
                    Console.WriteLine("\t" + arr[i][j]);
                }
            }

However when I enter the input in the console and try to run, I am getting an Index out of bound exception in here 

“ j

I then tried initializing the column too like this with both row and column 

“ int [] [] arr =新的int [3] [3];”。

当时，另一个错误是说**“无效的排名说明符：预期的'，'或']'”

Then I tried initializing the array as below 
"int[,] arr = new int[3,3];"

The invalid rank specifier error gone this time but error comes in the line of reading array elements,

probably this error may be due to not using arr[i][j] and reading each elements.

I just want to know what was the mistake in my initial code,that I don't get the value of GetLength(1).

和“ int [，] arr = new int [3,3];有什么区别？”和“ int [] [] arr = new int [3] [3];”

and also is there any optimized way to read a 2-d array like the statement,

rather than using 2 for loops.

I hope the question is clear. It would be so nice if somebody helps me with this problem. Thanks in Advance!!!

Answer 1

[int[,]是multidimensional array

[int[][]是jagged array，它是数组的数组

将锯齿状数组写入矩阵，您可以利用string.Join

连接指定数组的元素或元素的成员 集合，在每个元素之间使用指定的分隔符或 成员。

string.Join

输出

var arr = new [] {new []{1,2,3},new []{4,5,6},new []{7,8,9}};

for(int i=0;i<arr.GetLength(0);i++)
    Console.WriteLine(string.Join(", ",arr[i] ));