拆分时不能将 string[] 隐式转换为 string

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('-'); 

Answer 2

When you call split, it returns an array of strings. You can't assign string[] to a string variable.

Answer 3

As others have said, Split returns an array. However, you can split on more than one character at a time. For example,

string s = "a,b,c,d-d";
var split = s.Split(new[] {',', '-'});

In this case, the split array would contain 5 indices, containing "a", "b", "c", "d", and "d".