c#访问二维数组中的行

Question

如何在C#中访问一行二维数组？我想得到第一排的数量.

谢谢!

Answer 1

问题实际上取决于您正在考虑的2D阵列的类型以及您的行的尺寸.

适当的2D阵列

// Init
var arr = new int[5,10];

// Counts
arr.GetLength(0) // Length of first dimension: 5
arr.GetLength(1) // Length of second dimension: 10

锯齿状的"2D"阵列

// Init
var arr = new int[3][];
// Initially arr[0],arr[1],arr[2] is null, so we have to intialize them:
arr[0] = new int[5];
arr[1] = new int[4];
arr[2] = new int[2];

// Counts
arr.Length // Length of first dimension
// In this case the "second dimension" (if you can call it that) is of variable size
arr[0].Length // Length: 5
arr[1].Length // Length: 4
arr[2].Length // Length: 2