Two Dimensional Array C#

Question

I will get the input from the user like this - "99211,99212,99213_1,99214,99215_3" and I store it in a string as

string cpt = "99211,99212,99213_1,99214,99215_3";
cptarray = cpt.Split(',');

I got the output as

cptarray[0] = "99211"
cptarray[1] = "99212"
cptarray[2] = "99213_1"
cptarray[3] = "99214"
cptarray[4] = "99215_3"

But I would like the output to be:

cptarray[0][0] = "99211",""
cptarray[1][0] = "99212",""
cptarray[2][0] = "99213","1"
cptarray[3][0] = "99214",""
cptarray[4][0] = "99215","3"

If I need to get the output like above then can I use the 2D array, is it the correct approach?

Maybe you could use a Dictionary<long, int> or Dictionary<string, string> — Mate
– Mate, Commented Nov 17, 2016 at 19:14
What you show is not a 2D array, but a jagged array (an array of arrays). — John Alexiou
– John Alexiou, Commented Nov 17, 2016 at 21:07

Dmitrii Bychenko · Accepted Answer · 2016-11-17 19:51:45Z

2

According to the syntax provided:

 cptarray[0][0]
 ...
 cptarray[4][0]

you want a jagged array, not 2D one; you can construct this array with a help of Linq:

 var cptarray = cpt
   .Split(',')
   .Select(number => number.Split('_'))
   .Select(items => items.Length == 1 ? new string[] {items[0], ""} : items)
   .ToArray();

Test

string test = string.Join(Environment.NewLine, cptarray
  .Select((line, index) => string.Format("cptarray[{0}] = {1}", 
     index,
     string.Join(", ", line.Select(item => "\"" + item + "\"")))));

Console.Write(test);

Output

 cptarray[0] = "99211", ""
 cptarray[1] = "99212", ""
 cptarray[2] = "99213", "1"
 cptarray[3] = "99214", ""
 cptarray[4] = "99215", "3"

edited Nov 17, 2016 at 19:51

answered Nov 17, 2016 at 19:22

Dmitrii Bychenko

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3 Comments

Arun Over a year ago

this line shows syntax error - string test = string.Join(Environment.NewLine, cptarray .Select((line, index) => $"cptarray[{index}] = {string.Join(", ", line.Select(item => "\"" + item + "\""))}"));

Dmitrii Bychenko Over a year ago

@Aruna: do you use C# 6.0? $"..." is a string interpolation which appears in C# 6.0

Dmitrii Bychenko Over a year ago

@Aruna: I've changed string interpolation for string formatting in the test (see my edit)

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