c# - Cannot implicitly convert string[] to string when splitting

Question

I am new to c# and I don't understand why this isn't working. I want to split a previously splitted string.

My code is the following:

int i;
string s;
string[] temp, temp2;

Console.WriteLine("write 'a-a,b-b,c-c,d-d'";
s = Console.ReadLine();
temp = s.Split(',');

for (i = 0; i < temp.Length; i++)
    temp2[i] = temp[i].Split('-');

I get the following error Cannot implicitly convert type 'string[]' to 'string

I want to end with:

temp = {a-a , b-b , c-c , d-d};
temp2 = {{a,a},{b,b},{c,c},{d,d}};

Answer 1

The result of string.Split() is string[], which you should already see by the correct usage when you assign to string[] temp. But when you are assigning to the elements of string[] temp2, you are trying to store arrays of strings in slots that are meant to only store strings, hence the compiler error. Your code could work with a simple change below.

string[] temp;
string[][] temp2; // array of arrays 

string s = "a-a,b-b,c-c,d-d";
temp = s.Split(',');

temp2 = new string[temp.Length][];

for (int i = 0; i < temp.Length; i++)
    temp2[i] = temp[i].Split('-');