So in C# you can define an array like so:
string[] Demo;
string[,] Demo;
string[,,] Demo;
What does the , represent?
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1possible duplicate of What are the differences between a multidimensional array and an array of arrays in C#?Jeroen Vannevel– Jeroen Vannevel2015-08-23 18:24:11 +00:00Commented Aug 23, 2015 at 18:24
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3 Answers
The dimensions.
- No comma: 1 dimension
- 1 comma: 2 dimensions
- 2 commas: 3 dimensions
- and so on...
Learn more about multi-dimensional arrays on MSDN.
answered Aug 23, 2015 at 18:21
Matías Fidemraizer
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Multi-dimensional arrays.
The following example would declare a string array with two dimensions:
string[,] demo = new string[5, 3];
The [,] syntax is useful, for example, if you have a method taking a 2D array as a parameter:
void myMethod(string[,] some2Darray) { ... }
Note the difference between multi-dimensional arrays (e.g. string[,]), which are like a matrix:
+-+-+-+-+
| | | | |
+-+-+-+-+
| | | | |
+-+-+-+-+
| | | | |
+-+-+-+-+
and jagged arrays (e.g. string[][]), which are basically arrays of arrays:
+------------+
| +-+-+-+-+ |
| | | | | | |
| +-+-+-+-+ |
+------------+
| +-+-+-+-+ |
| | | | | | |
| +-+-+-+-+ |
+------------+
| +-+-+-+ |
| | | | | | <- possible in jagged arrays but not in multi-dimensional arrays
| +-+-+-+ |
+------------+
Reference:
Comments
These are multi-dimensional arrays.
The difference between this and array[][] as you might be used to is described here and here
