Using a foreach Loop for a Jagged String Array to display the Elements in it?

Question

i am Using for each Loop to a Jagged String Array in order to display the Elements in it but it is not working and i have tried this code !

public class Program
    {
        public static void Main(string[] args)
        {
            string[][] str = new string[5][];
            str[0] = new string[5];
            str[1] = new string[10];
            str[2] = new string[20];
            str[3] = new string[50];
            str[4] = new string[10];
            //Now store data in the jagged array
            str[0][0] = "Pune";
            str[1][0] = "Kolkata";
            str[2][0] = "Bangalore";
            str[3][0] = "The pink city named Jaipur";
            str[4][0] = "Hyderabad";
            //Lastly, display the content of each of the string arrays inside the jagged array
            foreach(string[] i in str)
                Console.WriteLine(i.ToString());
            Console.ReadKey();
        }
    }

I have used a foreach loop but it is Printing

System.String[]
System.String[]
System.String[]
System.String[]
System.String[]

as output .... So get me the Problem Solution Please as what i have to modify to get the Display as

Pune
Kolkata
Bangalore
The pink city named Jaipur
Hyderabad

you should do Console.WriteLine(i[0].ToString());

Chetan
– Chetan

2018-03-22 09:27:52 +00:00
Commented Mar 22, 2018 at 9:27 — Chetan
– Chetan, Commented Mar 22, 2018 at 9:27

Zohar Peled · Accepted Answer · 2018-03-22 09:35:47Z

2

A jagged array is an array of arrays - meaning you must have nested loops:

foreach(string[] i in str)
    foreach(string s in i)
         if(!string.IsNullOrEmpty(s))
             Console.WriteLine(s);

Another option is using linq's SelectMany:

foreach(var s in str.SelectMany(s => s).Where(s => !string.IsNullOrEmpty(s)))
{
    Console.WriteLine(s);
}

Or, if you want to only display the first cell of each nested array:

foreach(string[] i in str)
    var s = i[0];
    if(!string.IsNullOrEmpty(s))
        Console.WriteLine(s);

Note I've added a check for String.IsNullOrEmpty to avoid writing empty lines to the console.

edited Mar 22, 2018 at 9:35

answered Mar 22, 2018 at 9:28

Zohar Peled

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Comments

Ali Ezzat Odeh · Accepted Answer · 2018-03-22 09:29:21Z

1

Try updating your code with this to loop through each array entry in your array :

 foreach(string[] i in str)
 {
     foreach(string s in i)
     {
       Console.WriteLine(s);
     }
 }

answered Mar 22, 2018 at 9:29

Ali Ezzat Odeh

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Comments

Rahul · Accepted Answer · 2018-03-22 09:29:44Z

1

Your i itself is a string array and thus the result since Tostring() returning the default implementation of it. You need another loop to get to the real data item

foreach(string[] i in str)
{
  foreach(string j in i)
      Console.WriteLine(j);
}

answered Mar 22, 2018 at 9:29

Rahul

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Comments

Sergey Kalinichenko · Accepted Answer · 2018-03-22 09:31:27Z

1

Jagged array is an array of arrays, so you need a second, nested, loop.

The second loop could be explicit, or hidden inside some method that loops over entries that you pass to it. For example, string.Join would combine all strings from a jagged row into a single string for printing:

foreach(string[] row in str)
    Console.WriteLine(string.Join(" ", row));

You can use the same technique to eliminate the outer loop, too:

Console.WriteLine(string.Join("\n", str.Select(row => string.Join(" ", row))));

answered Mar 22, 2018 at 9:31

Sergey Kalinichenko

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1 Comment

Zohar Peled Over a year ago

Actually, using string.Join is probably the best option. +1.

MaxB · Accepted Answer · 2018-03-22 09:32:28Z

0

If you want to print all the strings in all the arrays, and not get an exception:

foreach (string[] i in str)
    foreach (string s in i)
        if (s != null)
            Console.WriteLine(s);

answered Mar 22, 2018 at 9:32

MaxB

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Comments

Sujeet Kumar Singh · Accepted Answer · 2018-03-22 09:35:28Z

0

Console.WriteLine(i[0].ToString());

answered Mar 22, 2018 at 9:35

Sujeet Kumar Singh

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