A brief analysis of defining integer arrays in C#

　Arrays in C# are reference types. The way to define integer arrays in C# is:

　int [] intArray = {1,2,3}; or int [] intArray = new int[10];

　 And in C++, integer arrays are defined The method of type array is:

　int intArray[] = {1,2,3}; or int * intArray = new int[10];

　C# defines that integer array can be one-dimensional or multi-dimensional, Matrices and ragged arrays are also supported.

Note: The way to define a multi-dimensional array (matrix) is [,,] and the way to define a multi-dimensional "staggered matrix" is [][]. In addition, the use of the new keyword does not necessarily mean that the object is dynamically allocated (entered on the stack).

　The following is a common way to define (one-dimensional) multi-dimensional arrays in C#:

　
　int []a1; //Define a one-dimensional array
　int [,]a2; //Define a two-dimensional array
　int [,, ]a3; //Define a three-dimensional array
　int []a1 = new int [10]; //Define the depth of a one-dimensional array
　int [,]a2 = new int [10,20]; //Define the depth of a two-dimensional array
int [,,]a3 = new int [10,20,30]; //Define three-digit array depth
　int []a1 = new int []{1,2,3}; //Initialization
　int [,] a2 = new int [,]{{1,2,3},{4,5,6}};

　You can also define a "ragged" array:

　
　int [][]var = new int [3][];
var[0] = new int[]{1,2,3};
var[1] = new int[]{1,2,3,4,5,6};
var[2] = new int[]{1,2,3,4,5,6,7,8,9};

　Note, the difference between int [,]a and int [][]a: the definition of the former defines a two-dimensional fixed array, which defines a two-dimensional variable array. It's just that they haven't been allocated space and initialized yet. int [][]var = new int[3][4]; is wrong.

　　The following error:

　
　class Test
　{
　static void F(int []arr){}
　static void Main()
　{
　F({1,2,3});//Error! {1,2,3} is not a valid expression.
　}
　}
　
　class Test
　{
　statci void F(int []arr){}
　static void Main()
　{
　F(new int []{1,2,3});
　}
　}

　The above introduces the definition of integer array in C#

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