StringBuilder.Chars[] Property in C#

StringBuilder.Chars[Int32] Property is used to get or set the character at the specified character position in this instance.

Syntax: public char this[int index] { get; set; }
Here, the index is the position of the character.

Property Value: This property returns the Unicode character at position index.

Exceptions:

• ArgumentOutOfRangeException: If the index is outside the bounds of this instance while setting a character.
• IndexOutOfRangeException: If the index is outside the bounds of this instance while getting a character.

Below programs illustrate the use of the above-discussed property:

Example 1:

// C# program demonstrate
// the Chars[Int32] Property
using System;
using System.Text;

class GFG {

    // Main Method
    public static void Main(String[] args)
    {
        // create a StringBuilder object
        // with a String pass as parameter
        StringBuilder str =
         new StringBuilder("GeeksforGeeks");

        // print string
        Console.WriteLine("String is "
                     + str.ToString());

        // loop through string
        // and print every Character
        for (int i = 0; i < str.Length; i++) {

            // get char at position i
            char ch = str[i];

            // print char
            Console.WriteLine("Char at position "
                              + i + " is " + ch);
        }
    }
}

Output:

String is GeeksforGeeks
Char at position 0 is G
Char at position 1 is e
Char at position 2 is e
Char at position 3 is k
Char at position 4 is s
Char at position 5 is f
Char at position 6 is o
Char at position 7 is r
Char at position 8 is G
Char at position 9 is e
Char at position 10 is e
Char at position 11 is k
Char at position 12 is s

Example 2:

// C# program demonstrate
// the Chars[Int32] Property
using System;
using System.Text;

class GFG {

    // Main Method
    public static void Main(String[] args)
    {
        // create a StringBuilder object
        StringBuilder str = new StringBuilder();

        // add the String to StringBuilder Object
        str.Append("Geek");

        // get char at position 1
        char ch = str[1];

        // print the result
        Console.WriteLine("StringBuilder Object"
                        + " contains = " + str);

        Console.WriteLine("Character at Position 1"
                     + " in StringBuilder = " + ch);
    }
}

Output:

StringBuilder Object contains = Geek
Character at Position 1 in StringBuilder = e

Reference:

• https://docs.microsoft.com/en-us/dotnet/api/system.text.stringbuilder.chars?view=netframework-4.7.2