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There is difference in these arrays in c#?
int[][][]
int[,,]
As far as I can see, it’s the same thing, but c# can’t cast from one to the other.
2 answers
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The cast is not possible because int[][][] and int[,,,] declare arrays different.
int[][][] is a array of arrays of arrays(Jagged array). Each element of the first array is a array which in turn has for elements a array. Each of the array may have different dimensions.
int[,,,] is a array three-dimensional(Multidimensional Array), each element is one int. Each row will always have the same number of columns.
It’s even possible to mix the two:
int[][,,][,]
The previous code declares a array one-dimensional(Single-Dimensional Array) of arrays three-dimensional of arrays two-dimensional int.
The notation [] indicates that the object is a array, the commas indicate the number of dimensions of the array.
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To Jagged Array is a Matrix of Matrices, a int[][] is a matrix of int[]. Elements can contain different sizes and dimensions.
Example:
int [][] jagged = new int [3][];
jagged [0] = new int [2]{1,2};
jagged [1] = new int [6]{3,4,5,6,7,8};
jagged [2] = new int [3]{9,10,11};
Illustration of the above code:
Already the Multidimensional Array (int[,]) is a single memory block (matrix itself). More cohesive looking like a box, square, etc where there are no irregular columns.
Example:
Three-row two-dimensional array across three columns.
int [,] multidimensional = new int[3, 3] {{1,2,3}, {4,5,6}, {7,8,9}};
Illustration.
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