Get an array of string from a jagged array

Question

I have a jagged array that contains other 1d string arrays:

string[] first = {"one","two"};
string[] second = {"three","four"};
string[][] jagged = {first,second};

When I try to get the sub-arrays, they give a null value (I might be doing something wrong):

foreach (string[] arr in jagged[][]) {
    // My stuff here
}

Did I do something wrong in the array initialization progress or do I have to convert the sub-arrays somehow?

what specific code is causing what specific error? (yes you might be doing something wrong but how will we know if you don't show what you're doing?) — Don Cheadle, Aug 05 '16 at 19:39
Just out of curiosity: why are you using arrays like this when .NET has so many better, easier-to-use options for collections of things? It's a full-featured, object-oriented programming language, not a scripting language. Take advantage of that. — rory.ap, Aug 05 '16 at 19:39
Does that even compile? `foreach (string[] arr in jagged[][])` doesn't look like valid syntax. — sstan, Aug 05 '16 at 19:42
Can you post that brings you null? because this doesn't compile - `... in jagged[][]..` — Gilad Green, Aug 05 '16 at 19:42

score 1 · Accepted Answer · edited Aug 31 '16 at 16:54

1

Just the foreach part is wrong. I have tested it like as follows:

string[] first = { "one", "two" };
string[] second = {"three","four"};
string[][] jagged = {first,second};

foreach (string[] arr in jagged)
{
    Console.WriteLine(string.Join(",", arr));
}

Output:

one, two

three, four

edited Aug 31 '16 at 16:54

Raktim Biswas

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answered Aug 05 '16 at 19:44

Henrique Forlani

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score 0 · Answer 2 · answered Aug 05 '16 at 19:45

0

It should be:

foreach (string[] arr in jagged)
{
    // My stuff here
}

I pasted your code on my local environment and could iterate just fine.

answered Aug 05 '16 at 19:45

Matias Cicero

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Raktim Biswas · Answer 3 · 2016-08-05T19:54:02.743

If you use jagged[][] in your loop, then possibly you get a type conversion failed message:

Cannot convert type 'char' to 'string'.

Instead use jagged in your loop.

public class Program
{
    public static void Main()
    {
        string[] first = {"one","two"};
        string[] second = {"three","four"};
        string[][] jagged = {first,second}; 

        foreach (string[] arr in jagged)
        {
            //Your code
        }
    }
}

Get an array of string from a jagged array

3 Answers3