How to convert an array of characters into a string in C#?

Converting an array of characters into a string is a common operation in C#. There are multiple approaches to accomplish this, each suitable for different scenarios.

Syntax

Following is the syntax for converting a character array to string using the string constructor −

string str = new string(charArray);

Following is the syntax using the string constructor with range specification −

string str = new string(charArray, startIndex, length);

Using String Constructor

The simplest way to convert a character array to a string is using the string constructor that accepts a character array −

using System;

class Program {
   static void Main() {
      char[] ch = new char[5];
      ch[0] = 'T';
      ch[1] = 'r';
      ch[2] = 'i';
      ch[3] = 'c';
      ch[4] = 'k';
      
      // converting to string
      string str = new string(ch);
      Console.WriteLine("Converted string: " + str);
   }
}

The output of the above code is −

Converted string: Trick

Using String Constructor with Range

You can also specify a starting index and length to convert only a portion of the character array −

using System;

class Program {
   static void Main() {
      char[] ch = {'H', 'e', 'l', 'l', 'o', 'W', 'o', 'r', 'l', 'd'};
      
      // Convert first 5 characters
      string str1 = new string(ch, 0, 5);
      Console.WriteLine("First 5 characters: " + str1);
      
      // Convert last 5 characters
      string str2 = new string(ch, 5, 5);
      Console.WriteLine("Last 5 characters: " + str2);
      
      // Convert entire array
      string str3 = new string(ch);
      Console.WriteLine("Complete string: " + str3);
   }
}

The output of the above code is −

First 5 characters: Hello
Last 5 characters: World
Complete string: HelloWorld

Using String.Join Method

Another approach is using the String.Join() method with an empty separator −

using System;

class Program {
   static void Main() {
      char[] ch = {'C', '#', ' ', 'i', 's', ' ', 'f', 'u', 'n'};
      
      string str = String.Join("", ch);
      Console.WriteLine("Using String.Join: " + str);
   }
}

The output of the above code is −

Using String.Join: C# is fun

Comparison of Methods

Conclusion

Converting a character array to string in C# is most efficiently done using the string constructor. Use the parameterized constructor when you need to convert only a specific portion of the array, and consider String.Join() for more complex scenarios.