C# Multidimensional Arrays: What's the Difference Between `[][]` and `[,]`?

The multi -dimensional array in the c#

and [][] [,] When creating a multi -dimensional array in C#, there is a difference between

and

grammar. [][] [,] The array of an array (

)

[][]

This grammar creates a reference array of an array. Each element of the array can have different lengths to create a jagged array.

double[][] ServicePoint = new double[10][]; Unified two -dimensional array (

)

[,] This grammar creates a unified two -dimensional array, of which each element is the same size. Unlike the sawtooth array, it requires specified rows and indexes during the assignment period.

Why (1) report an error

double[,] ServicePoint = new double[10, 9];

The grammatical error is because C# requires only one index when creating an array in the array. The second index is specified when it is assigned to each element.

Why

Failure in (2)

Because is a unified two -dimensional array, the assignment must specify and indexes at the same time.

It is meaningless, because it tries to access one -dimensional array in the two -dimensional array. double[][] ServicePoint = new double10;

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