Equivalent of java arrays in c# only one index

Question

you know that in java you can use the rows of an array just by calling the index of the row, which is the equivalent in c#?

int[][] matrix = {{0,1},{2,3}};

If I want to use row 0, I only reference it like this:

int[] row1 = matrix[0];

row values will be:

{0,1}

Now how do I do this in c #? with the:

  int[,] matrix = {{0,1},{2,3}};

If I refer to the array with a single value I receive:

int[] row = matrix[j];

I thank you

What is keeping you from doing *exactly the same* as you do in Java? — nvoigt, Apr 30 '21 at 05:36
int[][] matrix = new int[2][2]; invalid rank specifier: expected ',' or ']' — cacasswein, Apr 30 '21 at 05:40
@nvoigt I do not understand your question, I uploaded my error, I wanted to do it as in java but I cannot get another error, the one above — cacasswein, Apr 30 '21 at 05:42
Granted, C# is a little more verbose in array initialization: `int[][] matrix = new [] { new[]{ 0, 1 }, new[]{ 2, 3 } };` — nvoigt, Apr 30 '21 at 05:44
@nvoigt I don't want to set the values directly, I just want to give it dimensions, how could I do it? Excuse me, I'm new, I thought there was only the way [,] — cacasswein, Apr 30 '21 at 05:47
Did you try giving each of my inferred "new[]{}" constructs a number instead, like "new int[2]"? — nvoigt, Apr 30 '21 at 05:50

Caius Jard · Answer 1 · 2021-04-30T05:49:07.563

The java and the c# are not the same. Your c# uses a multidimensional array and your java uses a jagged

Change your c# to a jagged and init it:

int[][] matrix = {new[]{0,1},new[]{2,3}};

The slight syntax different here versus java is that you have to new[] the inner arrays but you can omit the type because the compiler is willing to infer it from the type it sees the elements as inside the curly brackets. Omitting the new[] entirely gives a helpful compiler error outlining that array initializers can only be used in assignments (and this inner array is not an assignment in that sense) and suggests the use of "new" again :)

C# documentation on jagged arrays has lots of useful tips: https://learn.microsoft.com/en-us/dotnet/csharp/programming-guide/arrays/jagged-arrays

Equivalent of java arrays in c# only one index

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