What does it mean when there is a comma inside an array declaration? e.g. float[,]

问题

I have some code I'm trying to understand while learning C#. I do not understand what I even need to search Google for to get here, but the code is as follows:

float[,] heightAll = terData.GetHeights(0, 0, allWidth, allHeight);

Why does the array declaration have a comma in between the brackets?

回答1:

That would be a two-dimensional array. You can also specify more dimensions:

Multidimensional Arrays (C# Programming Guide)

回答2:

Each comma adds an additional dimension to the array [,] = 2 dimensional [,,] = 3 dimensional ...

回答3:

That the array is multi-dimensional - two-dimensional in your case.

回答4:

It means it is a multidimensional array.

See MSDN.

来源：https://stackoverflow.com/questions/13807493/what-does-it-mean-when-there-is-a-comma-inside-an-array-declaration-e-g-float