C# Multidimensional Arrays: `[][]` vs `[,]` – What's the Difference?

and Multi -dimensional array [][] [,] C# multidimensional array can be represented in two syntax:

and

. Although they look similar, there are key differences between the two. [][] [,] Sawtooth array

[][]

This grammar creates an array of an array.

Each element is a reference to a separate double[][] ServicePoint = new double[10][]; array. The advantage of the serrated array lies in its flexibility. Its line can have different lengths, allowing irregular data structures.

Uniform group ServicePoint double

[,] On the contrary, the unified array is a rectangular grid with a fixed number of rows and the number of columns. Here, 10 lines and 9 columns make it two -dimensional. Each element in the grid is accessed by rows and indexes.

The grammar errors in grammar double[,] ServicePoint = new double[10, 9];

The error in the grammar example is because the second dimension cannot be specified when the statement is declared. You must first declare the array as an array (only one index): ServicePoint

Then, when creating each array in the external array, it can specify its dimension: [][]

[][] The assignment errors in grammar

double[][] ServicePoint = new double[10][]; The error in the second example is that the unified array is not allowed to assign a one -dimensional array to the line or column. This is because each element in the array is a single

, which requires lines and column indexes to access.

In short,

indicates a sawtooth array, each of which can have different lengths, and ServicePoint[0] = new double[13]; means a unified array with a fixed number of rows and the number of columns. Understanding this difference is essential for effective use of multidimensional arrays in C#.

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