C# program to separate joined strings in C#

In C#, you can join string arrays into a single string using string.Join() and then separate the joined string back into individual elements using the Split() method. This is useful when you need to manipulate strings by combining them temporarily and then extracting the original components.

Syntax

Following is the syntax for joining strings −

string joinedString = string.Join(separator, stringArray);

Following is the syntax for separating joined strings −

string[] separatedArray = joinedString.Split(separator);

Parameters

• separator − The character or string used to separate elements during joining and splitting.

• stringArray − The array of strings to be joined.

• joinedString − The combined string that will be split back into individual elements.

Example

using System;

public class Demo {
   public static void Main() {
      string[] str = { "Java", "AngularJS", "Python", "jQuery", "HTML5" };

      // join words
      string res = string.Join(" ", str);
      Console.WriteLine("Joined Strings...
 " + res);
      string[] convert = res.Split(' ');
      Console.WriteLine("\nSeparate Joined Strings...");

      foreach (string val in convert) {
         Console.WriteLine(val);
      }
   }
}

The output of the above code is −

Joined Strings...
 Java AngularJS Python jQuery HTML5

Separate Joined Strings...
Java
AngularJS
Python
jQuery
HTML5

Using Different Separators

Example

using System;

public class Program {
   public static void Main() {
      string[] languages = { "C#", "Java", "Python", "JavaScript" };

      // Join with comma separator
      string commaSeparated = string.Join(",", languages);
      Console.WriteLine("Comma separated: " + commaSeparated);

      // Split back using comma
      string[] splitByComma = commaSeparated.Split(',');
      Console.WriteLine("Split by comma:");
      foreach (string lang in splitByComma) {
         Console.WriteLine("- " + lang);
      }

      // Join with pipe separator
      string pipeSeparated = string.Join("|", languages);
      Console.WriteLine("\nPipe separated: " + pipeSeparated);

      // Split back using pipe
      string[] splitByPipe = pipeSeparated.Split('|');
      Console.WriteLine("Split by pipe:");
      foreach (string lang in splitByPipe) {
         Console.WriteLine("- " + lang);
      }
   }
}

The output of the above code is −

Comma separated: C#,Java,Python,JavaScript
Split by comma:
- C#
- Java
- Python
- JavaScript

Pipe separated: C#|Java|Python|JavaScript
Split by pipe:
- C#
- Java
- Python
- JavaScript

Common Use Cases

• Data Processing − Converting between array format and delimited strings for file I/O.

• Configuration Files − Storing multiple values as comma-separated strings.

• URL Parameters − Building and parsing query strings with multiple values.

• CSV Processing − Handling comma-separated values in data files.

Conclusion

The combination of string.Join() and Split() methods provides a powerful way to convert between string arrays and delimited strings. This technique is essential for data processing tasks where you need to temporarily combine strings and then separate them back into individual components.